Malicious PDF — malware analysis report

Static analysis result for SHA-256 5326d66095b9448e…

MALICIOUS

PDF

76.2 KB Created: 2021-08-18 11:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ab3dbdde5428d0696c6a845f12aee2b7 SHA-1: 14c8f0d54eaf565ffb7bebfddc96db24d2f86369 SHA-256: 5326d66095b9448e7dac10da4b8b765ca2f31faa6d437d151d3ae8c0d69a1792
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier strongly indicated maliciousness, and the 'SE_CALLBACK_LURE' heuristic confirms a callback phishing or tech-support scam pretext. The document contains numerous links to potentially compromised WordPress sites, suggesting it's part of a link farm designed to host or redirect to malicious content. No scripts were extracted, but the presence of embedded URLs and the nature of the heuristics point towards a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b29bb7843e7---86134767670.pdf In PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160710dac13a2d---sovavuxu.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/nude0251cviat1plntrcdjvlon/79420727322.pdfIn PDF document text
    • http://www.saraviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160888ce4c44cb---ketipa.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/spp96uofqs7a7b2hrmbvsj6vnr/92611348291.pdfIn PDF document text
    • https://mziagroup.com/wp-content/plugins/super-forms/uploads/php/files/mtamh1on1biu38ast7kfcdmjev/84166789704.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607510592e653---18234585374.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/vedex.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/zawaxalav.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091c464d4c22---xofezebexizelesele.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/46756204604.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/0303a78a444624fea72dae28b4c8c848/37838174799.pdfIn PDF document text
    • https://cwlighting.com/wp-content/plugins/super-forms/uploads/php/files/75dd62dbbe52eb9bb05566f93b0ee2aa/negowoketosad.pdfIn PDF document text
    • http://bettaletroom.com/file_media/file_image/file/kowuwozowibonezixoza.pdfIn PDF document text
    • http://saamfactory.com/wp-content/plugins/super-forms/uploads/php/files/a9c2cac708127a1c97bc844c314d27a8/67428861875.pdfIn PDF document text
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160b30ea2588ba---jobizusezefan.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/7e4b197d341ee695916b782dcd8bc71b/94220210327.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f0654d9b1a---30254842149.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/sujivezirekuz.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16081ee250a29b---19158167441.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070357e0e602---nimometusekuzebufuxugi.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160922bb9d4bf3---13766205337.pdfIn PDF document text
    • http://pomocnaukowa.net/Upload/file/68363628921.pdfIn PDF document text
    • http://firanywiktoria.pl/uploads/editor/file/66398800957.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/6hiqadhrkjd811pt9v0kj3sdr3/puwutoxabibewikimepaket.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=hindu+creation+story+ks1+sequencingPDF 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_off0000c906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC906 10992 bytes
SHA-256: b24d123d4b10ca3dc440e64ef74aa35bb39e9d9edf0ed7bf5a70f80c0c732a0c
font_01_sfnt_off0000e23f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA51 15840 bytes
SHA-256: 851cbf7475640fcff7a470d09a8416b90556537bb543ff9f89a92c3a2ac45cb3

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