Malicious PDF — malware analysis report

Static analysis result for SHA-256 592544748b544da3…

MALICIOUS

PDF

82.6 KB Created: 2021-09-15 11:05:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c75711a0736febf898fba5201afb1395 SHA-1: 8478c21b5753207466c91e0ad58fbb9d38fe6a4e SHA-256: 592544748b544da3822877689e4bcd8891e44bb981f841383fafacf8c8be323e
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to download files from compromised websites, a common tactic for phishing or malware distribution. The presence of multiple external URIs and PDF-specific heuristics related to link farms strongly supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

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://cructi.ru/uplcv?utm_term=download+plant+vs+zombie+versi+lama PDF link annotation
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/ziruwokajetodanozegur.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b4fe980ecb5d744cda716f4b31cb224b/gugunaralosofek.pdfIn PDF document text
    • https://kaplaitalia.it/userfiles/files/wurulufilekiselezurezaw.pdfIn PDF document text
    • https://semot.com/Store/userfiles/file/49688782595.pdfIn PDF document text
    • https://dogathermalhotel.com/resimler/files/5250804289.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/muxugubovaril.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/62140039674.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/c1588d4b0c9c72fbd071244a82388169/kigerosirupimodin.pdfIn PDF document text
    • https://felicityokolo.com/file/45007172478.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/30726457588.pdfIn PDF document text
    • http://ukrainski-rosyjski.pl/userfiles/file/lixelerinemawamubinutexu.pdfIn PDF document text
    • http://konikanarrowfab.com/ckfinder/userfiles/files/bonuto.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140946040841---72947992406.pdfIn PDF document text
    • http://gordostcrista.ru/userfiles/file/pisimowixoluzojamojofuve.pdfIn PDF document text
    • http://fulns.com/uploadfile/fckedit/file/1630804802EWhj.pdfIn PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/27309629069.pdfIn PDF document text
    • https://soudurelauziere.com/upload/editor/file/xonegedilupumoxawifodapir.pdfIn PDF document text
    • https://mintedimages.com/ckfinder/userfiles/files/lodumumesalave.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/94237886469.pdfIn PDF document text
    • http://fxlcd.com/upload/file/tisegepe.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/watuliwanimepefejoma.pdfIn PDF document text
    • http://amicalelaique-guyancourt.fr/ckfinder/userfiles/files/jowinididamadedinoveka.pdfIn PDF document text
    • http://yokosohk.com/files/fckfiles/file/47761039077.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/mukonag.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/92105925241.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/sekel.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-7/20210907175937342919.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_off0000dced.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCED 17784 bytes
SHA-256: 7d383e8aa9300234fdd7684a6916e2d98db411c933d1995d9a40b4dbe946e3f0
font_01_sfnt_off00010b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B29 10904 bytes
SHA-256: 9d4c254785270c5cab3d9c1e1af58b77a38fcbbb2d4255df7c26641c0473ecc9
font_02_sfnt_off0001243d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1243D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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