Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ab74e62d78db129…

MALICIOUS

PDF

108.2 KB Created: 2021-09-03 11:23:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-18
MD5: f1b3a021c4575f226719b705b57e8978 SHA-1: ead0dad894b4e2426c0c0a1f20ca881cdd68b07a SHA-256: 3ab74e62d78db1291a9ea38cae9cc42ddcf59ab01a08c55067d0da71c1e2caf9
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://oniceh.ru/uplcv?utm_term=commentary+on+the+code+of+canon+law+1983+pdf PDF link annotation
    • http://zzquansu.cn/d/files/pixujazizitizutenupunaw.pdfIn PDF document text
    • http://abwlanham.com/uploads/files/wolovudufajolojafukorolu.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/darukepokoza.pdfIn PDF document text
    • http://www.ciesol.es/ckfinder/userfiles/files/fubogod.pdfIn PDF document text
    • http://drlalashow.com/php/billboard/uploads/file/gaxusu.pdfIn PDF document text
    • https://mwasafat.com/uploads/files/71036784076.pdfIn PDF document text
    • http://www.studiolegalefusimorelli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8aa65629ca---98744137171.pdfIn PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e88a852718---47826658259.pdfIn PDF document text
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/5ffc6b25a151aff9908de105661481d1/pesexires.pdfIn PDF document text
    • https://typeone.com.my/ckfinder/userfiles/files/32115489419.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/zizifagem.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/3a85186f51a97b3efba9cca0f66bd84d/tesakepowejarak.pdfIn PDF document text
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c998b6734dd---44932755457.pdfIn PDF document text
    • https://pharmalogindia.in/ckfinder/userfiles/files/25740028521.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/13d7b305491b1ce45230efa75d3ce4b7/bulagetakujidetuv.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/avqac2od0ie2l62auf7r7q8j7t/ponivekok.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160b49755a9025---lomokadapotufixaruda.pdfIn PDF document text
    • http://worldtile.net/jangheung/userfiles/file/35925859169.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/95568416114.pdfIn PDF document text
    • http://tarasovfabrika.ru/uploads/file/pogixunibuj.pdfIn PDF document text
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bc606574a31---gibulemidu.pdfIn PDF document text
    • http://larrysiegellaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/wanewoveros.pdfIn PDF document text
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/v9sfpp6dstnqi8lfulv9ns3p90/95429271733.pdfIn PDF document text
    • http://www.gcsystem.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b2d63c9941---23745222919.pdfIn PDF document text
    • 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_off00013c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C95 19248 bytes
SHA-256: 3a1533966d8516bd0484c245f6083491ba5730985c2dab9f8388f108af215c39
font_01_sfnt_off00016ed7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16ED7 11456 bytes
SHA-256: af7485b464cb63be95330c840f4a8a872083378b975f751e775601d30e97b693
font_02_sfnt_off000189f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x189F4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1