Malicious PDF — malware analysis report

Static analysis result for SHA-256 438687efbedfcbe0…

MALICIOUS

PDF

84.3 KB Created: 2021-09-01 07:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: f869ce956cb3b1cab82c67129beb8047 SHA-1: 3d2dbad654aa11c45394c44b2e7b748e7b8484ea SHA-256: 438687efbedfcbe00905b6eacef39d3c005358dcf92e67d2fc491ef9bc91d9e7
116 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to multiple compromised CMS upload locations, suggesting an attempt to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document is designed to trick users into calling a phone number, consistent with callback phishing or tech-support scams. While no scripts were explicitly extracted, the ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links supports a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://www.varisistanbul.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607223f624e5f---bubevumabok.pdf In PDF document text
    • https://www.sensiblemachines.com/ckfinder/core/connector/php/files/91795492005.pdfIn PDF document text
    • https://eastmanllc.net/ckfinder/userfiles/files/jofev.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/35639084225.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a39724f12---4005679099.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/55453820165.pdfIn PDF document text
    • http://seoulsquare.com/userfiles/file/xufanejefewibexavafobi.pdfIn PDF document text
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/30b2b8b1dcf04a038f9838d9cb54ac89/dedur.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6d3a4d96---10868617146.pdfIn PDF document text
    • https://www.elementstraining.co.uk/wp-content/plugins/super-forms/uploads/php/files/bg2a4o1fp8kc73kn3rskanpo2t/lirimimugatapofivekese.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a5d3a4ed9bc---femujubebumox.pdfIn PDF document text
    • http://carrasvilla.es/uploads/files/97082919865.pdfIn PDF document text
    • https://dimensioninteractive.com/WYSIWYGImage/file/75334523135.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b530ec6eb1b---80361201648.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/26iq74ohgmk5uoa37qh0j6ppg1/welulapusovum.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/38010724448.pdfIn PDF document text
    • https://pinkrali.com/calisma2/files/uploads/bipufojozigog.pdfIn PDF document text
    • http://k2plusinterior.com/userfiles/rixipebuwureri.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f59b75ff54---38513775795.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160aefafae44ee---rawerulaxekanaj.pdfIn PDF document text
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/lukom.pdfIn PDF document text
    • http://tjtvina.com/Upload/files/42209016744.pdfIn PDF document text
    • http://alessandrobelleseveterinario.eu/userfiles/files/dixenuferufekakivanosaso.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=nordictrack+classic+pro+skier+manualPDF 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_off0000e3fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0D 18008 bytes
SHA-256: eb1787dbec1b4fefd73ddf2bb1d9c342f387ff4cbca4697e7c5fc0b6260700de
font_02_sfnt_off00012ae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AE0 10844 bytes
SHA-256: 2b988388afb8a28e0af07f38ee1a9ec700335e142f3a7fdbdda704059f403b3c

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