Malicious PDF — malware analysis report

Static analysis result for SHA-256 998d0b4cfc80cf15…

MALICIOUS

PDF

89.9 KB Created: 2021-08-18 08:57:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 725630d9b7466e48573bf3f246013d38 SHA-1: f09e94a09593121388fe9db72d7b7824e36b2043 SHA-256: 998d0b4cfc80cf15f132106c0876051d9af09a9376132e34bad64dcf33b8754d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links to compromised WordPress sites and disposable hosting, suggesting it is part of a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is intended to trick users into calling a phone number, a common tactic in phishing and tech-support scams. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

Heuristics 7

  • 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.
  • 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://mps-india.com/userfiles/files/56618666864.pdf In PDF document text
    • https://zabulgaria.org/userfiles/file/68608604673.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/86516655308.pdfIn PDF document text
    • http://ty-int.com/files/files/nosazigazuwozod.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606f719406452---mopopopubome.pdfIn PDF document text
    • https://traveltokiev.com/wp-content/plugins/super-forms/uploads/php/files/0uc1262rvfpg8he3cebivi3rb0/sepamitofemigobawefa.pdfIn PDF document text
    • http://rajskiewakacje.pl/userfiles/file/lugibifexator.pdfIn PDF document text
    • http://openendrep.com/userfiles/files/75284024671.pdfIn PDF document text
    • https://catwalkdogcome.com/editor_upload_image/file/wezotesabosikivuniguv.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdce99449ae---88255228393.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4fe0e7735---38434969097.pdfIn PDF document text
    • https://wisestudentz.com/userfiles/file/getebunibupitolumolore.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6758970517---54052271527.pdfIn PDF document text
    • http://workprohealth.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608666a1a45bb---84581666822.pdfIn PDF document text
    • http://barcelonasixtytwo.com/userfiles/file/98464137812.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610448aebfa35---13033261676.pdfIn PDF document text
    • http://duszek-lasu.pl/userfiles/file/jadufixim.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0aaeb254fe9f79614b7c0fcdcab21004/97167416977.pdfIn PDF document text
    • http://bangdinhphucat.com/quangbasanpham/app/webroot/upload/image/files/27269627403.pdfIn PDF document text
    • https://armagedonspedycja.pl/files/file/81632062858.pdfIn PDF document text
    • https://saam.vn/images/content/file/85596319259.pdfIn PDF document text
    • http://pietroquatriniarchitetto.eu/userfiles/files/xetex.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210625115814.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/afa6bc722eb8a6155d75a274140a7351/30776064511.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/fenupujavomekazegesi.pdfIn PDF document text
    • http://conblocmanado.com/pics/file/lobopojatuxarij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=what+to+do+if+you+lost+original+power+of+attorneyPDF 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_off0000fae2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAE2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000112f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112F9 11072 bytes
SHA-256: 763bde7e0a86f370d863bc4565a4ed0b83ac2cdc8747f85f92d2bd2267b98e29
font_02_sfnt_off00012c92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C92 17044 bytes
SHA-256: 6e57e6d63c72fe0cbff24de32ce01f28fb539e5d16fc5258c9a61927d28ab1b9