Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c7a4701064e940…

MALICIOUS

PDF

113.1 KB Created: 2021-09-13 20:45:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: f331bb1531a7d818ca3f6bb6511b1350 SHA-1: 4e9672006d7d66b3cd463348288416d41e1a9f9d SHA-256: f9c7a4701064e94088fb35773b7385591fd4f3c2c7944541742e7e87d81f4e06
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a callback phishing or tech-support scam. It contains embedded JavaScript and numerous links to potentially compromised or disposable hosting sites, suggesting an attempt to deliver a secondary payload or redirect the user to a malicious site. The document body is heavily obfuscated and unreadable, but the heuristics indicate a lure involving phone calls for billing or security issues.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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 http://ykzn8.com/upfiles/editor/files/refuluzalutinezozujolovom.pdf In PDF document text
    • https://thokhoavietnam.com/upload/files/46467487971.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/61818477840.pdfIn PDF document text
    • http://villacappuccina.com/userfiles/files/wizovevapogadopi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/riziliwikowexolujavifemo.pdfIn PDF document text
    • https://moraure.net/js/ckfinder/userfiles/files/susexosaxawidisu.pdfIn PDF document text
    • https://marsanz.pl/uploads/fck/file/2932779041.pdfIn PDF document text
    • http://smelawservice.com/file_media/file_image/file/mujosi.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/14318813964.pdfIn PDF document text
    • http://scro.ru/pic/file/posokitulidutesujo.pdfIn PDF document text
    • http://alpinedelhi.com/userfiles/files/57783929092.pdfIn PDF document text
    • http://phoiinnhiet.com/images/uploads/files/51681240756.pdfIn PDF document text
    • http://eunlocker.com/Images/Editor/file/dowupemanasi.pdfIn PDF document text
    • http://refah4ter.info/basefile/hotelrefah4terir/files/papuse.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/f26fcd512ad390ee44dfc0191ab1d64d/nuzasalek.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613315dc0b46a---95146983212.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a01a944765---pugaziw.pdfIn PDF document text
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba3334e8b1---80710074602.pdfIn PDF document text
    • https://thietbivesinhanhhuy.com/asset/files/49051148419.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613c82fbda21e---95028421947.pdfIn PDF document text
    • http://baigeleather.com/userfiles/file/malowibukaxejolukaxagi.pdfIn PDF document text
    • http://nm-union.ru/ckfinder/userfiles/files/38552016621.pdfIn PDF document text
    • https://gangnampools.com/contents/files/67053303599.pdfIn PDF document text
    • https://chatham-ebenezer.ckdomain.com/uploads/userfiles/files/17008714525.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=dragon+ball+season+listPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00015992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15992 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000171a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171A9 10424 bytes
SHA-256: 878f1d6006c0841bfc176666ac23d5bc8f9e5956d3743f8d9d67a58ac8dda816
font_02_sfnt_off00018962.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18962 17436 bytes
SHA-256: deee610ee5f1679f63c0c135120f049d4ecfbad04b83c15f7fe1d1313ff7ace4

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