Malicious PDF — malware analysis report

Static analysis result for SHA-256 01f1c9ce90cbe871…

MALICIOUS

PDF

187.1 KB Created: 2021-07-26 03:27:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 9d3b715de4ed5d7400ead58555a26970 SHA-1: 708da207cf4495baad3602353ffaf8f3a4a0b2c3 SHA-256: 01f1c9ce90cbe87196a6458197b677a24510c3cb48c3cbfc1a408cd9ba14f875
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a callback-phone (TOAD) lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9647

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607033fd9e869---6992452780.pdf In PDF document text
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b03cef82b77---183285868.pdfIn PDF document text
    • https://festivalecolo.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b6a8e85a0---dizon.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/82g9jeosg3104a1sbkvgicb9g3/38519826779.pdfIn PDF document text
    • http://citywideok.com/clients/75789/File/tifatiduxutaxolifum.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/0de9169279622891aa5828a446be5cbe/kewerivopotewi.pdfIn PDF document text
    • http://shbaicun.com/userfiles/file/2021072606202773499.pdfIn PDF document text
    • https://editions-tlp.fr/ckfinder/userfiles/files/dibikuxuwixalerete.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/1vqn5s757mv355h84n6c7ar850/bexamovadofeluwumif.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/ucjfdbdrp719h1426o5cfif3hl/lopifutuxawakufepedufagir.pdfIn PDF document text
    • https://susta.vn/userfiles/file/31573355517.pdfIn PDF document text
    • http://carnow.jp/js/upload/files/pomejetenulorewesabasi.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088f85127452---52364857245.pdfIn PDF document text
    • http://minisadik-margaritka.ru/admin/ckfinder/userfiles/files/10912965079.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/rijaduwexutojudokusutot.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082ec892bf95---legawete.pdfIn PDF document text
    • http://dejede.com/userfiles/file/rexizakutinikudutajenure.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/dadoxasupow.pdfIn PDF document text
    • https://levin-dent.ru/wp-content/plugins/super-forms/uploads/php/files/ed4ffa4ad4ddd746e85d0b62315df958/65963592546.pdfIn PDF document text
    • https://cavalier-hundezucht.ch/userfiles/file/37431571107.pdfIn PDF document text
    • https://www.algeos.com/js/ckfinder/userfiles/files/22442115362.pdfIn PDF document text
    • https://interesttour.com/wp-content/plugins/super-forms/uploads/php/files/27b0614187d0eca5b174f91646cf6242/34113492309.pdfIn PDF document text
    • https://dm288.com/slicice/file/79158602692.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1606f0cfcd3523---49520807506.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b805598ec1f---nolosanisevojivadafataw.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/d9fbc803fe07836aba41c5b09d642d07/kovonitimemanomelupeti.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=is+hbo+free+on+directv+nowPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00026bfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x26BFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00028413.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x28413 10608 bytes
SHA-256: 60633be67d2299f5226f83c02227b0f4ccf88599e8487a6723afb5fa78bfb36e
font_02_sfnt_off00029c4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x29C4A 2436 bytes
SHA-256: 63a8187a6ac4be67cc1ded674165a30cb874468bef1b10017d1ad2356f836c70
font_03_sfnt_off0002a6d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x2A6D3 21596 bytes
SHA-256: 25e28d756fa0cb77d924114e9fd59fbd1bcd754bf3865f0b7a4b2a693bb1d707

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