Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c5c774112704fd0…

MALICIOUS

PDF

84.9 KB Created: 2021-09-01 17:13:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 696b83a5a7912567bc8ecd094e20806d SHA-1: ee7632fb2418f0caabdb06462c89ec5dc63552b6 SHA-256: 7c5c774112704fd0c7ba7116dbb91e4b7dbd9aee86859e72f3e7eadf25d0f52a
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It functions as a link farm, with many embedded URLs pointing to various domains, some of which are hosted on compromised CMS upload directories. The presence of numerous links and the nature of some hosting suggest an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 http://technoculture.cz/admin/upload/file/2468071843.pdf In PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/37b49e8314e92655a0a4a7049eaa7f6f/37513993799.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a8f172e151c---nebimi.pdfIn PDF document text
    • http://neonyazilim.com/images/Media/files/85170412028.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/32704768072.pdfIn PDF document text
    • https://www.jancsoalapitvany.hu/ckfinder/userfiles/files/33777052347.pdfIn PDF document text
    • http://chikatere.com/Upload/files/43818356017.pdfIn PDF document text
    • http://hoavily.com/uploads/files/34855791825.pdfIn PDF document text
    • http://pokewaveanaheim.com/uploads/files/45534154629.pdfIn PDF document text
    • https://sapporomn.com/userfiles/files/17812106115.pdfIn PDF document text
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/m9ve1956abun07biktt62qrj0n/tikekuwodesikuton.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/kafodopipe.pdfIn PDF document text
    • http://mpwlawpa.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tixajesemebisolafazofo.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/23419953832.pdfIn PDF document text
    • http://debten.net/UserFiles/File/vusif.pdfIn PDF document text
    • https://zohopin.com/calisma2/files/uploads/37809818671.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/57401847691.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/dafujesojuniregox.pdfIn PDF document text
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/93bfbbf485092bfd2223ef19228a08ba/53201391391.pdfIn PDF document text
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/4jdeanfft5osrskfb4t8vthaim/wedanu.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f3b009cb1a---94836068522.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/wotirusojed.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=the+si+unit+of+electric+charge+isPDF 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_off0000e4e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fcf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCF3 18524 bytes
SHA-256: 120913762ba6335de004712fad525bdf46c835f6aca7419d9f352a8d983f849f
font_02_sfnt_off00012cf7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CF7 10676 bytes
SHA-256: 38089629cdae26bca67c1e7dc8dc3c9f54cb660f507f23b8ddfa7c4bef82a58e

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