Malicious PDF — malware analysis report

Static analysis result for SHA-256 20f8943f9303361b…

MALICIOUS

PDF

77.6 KB Created: 2021-09-11 22:35:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 63df9ff41bc686e2210869d811af0a4d SHA-1: 3ab091a3bcc93cf05334222eef62b705a0790ef2 SHA-256: 20f8943f9303361baaeb5e9526b6358c08def362f85669d50c3710583d7bfa44
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS upload storage, suggesting a link farm designed to host malicious content. The 'SE_CALLBACK_LURE' heuristic indicates the document's content is designed to trick users into calling a phone number, a common tactic in tech-support scams and callback phishing. While no scripts were directly extracted, the ML classifier and ClamAV detection strongly indicate malicious intent, likely involving the delivery of a secondary payload or redirection to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://vom-ragnaroek.de/uploads/file/4630564532.pdf In PDF document text
    • http://xn--9i1b14lzokxjcrti5um.com/upload/fckeditor/file/sexarisivop.pdfIn PDF document text
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343f4cce8e8---japusotam.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8072700f6---xokefimopenebawazox.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/0vqibp0bg8v779qvplbfgq66od/6597535382.pdfIn PDF document text
    • https://dacinsara.ro/fckfiles/file/fatubaw.pdfIn PDF document text
    • https://mongolia-volkslift.com/uploads/files/suvusowup.pdfIn PDF document text
    • http://capri.lt/userfiles/files/57498654436.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nfa686vmshq3a1mn4ahls0gif5/26406993774.pdfIn PDF document text
    • https://stephan-kratt.de/data/reiterhof/userfiles/file/pexidixeguruk.pdfIn PDF document text
    • https://alrukn.co/userfiles/files/tezefuzidorejele.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/50099596904.pdfIn PDF document text
    • http://oxigensupplies.com/shipinc/userfiles/files/25340149976.pdfIn PDF document text
    • http://ylpcl.com/ckfinder/userfiles/files/pomoxurerajagubifu.pdfIn PDF document text
    • https://la-klamm.org/userfiles/file/molufuxetibe.pdfIn PDF document text
    • http://tianlanlawyer.com/filespath/files/20210909173826.pdfIn PDF document text
    • http://gvs-russia.ru/admin/ckfinder/userfiles/files/8361964616.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/likewepagazixikuwineri.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/wosidokifivifobosolutuzal.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/5902226513.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fikuzurisixuxeno.pdfIn PDF document text
    • https://k-barrierfree.com/FileData/ckfinder/files/20210906_886A68DF172AECE2.pdfIn PDF document text
    • http://tcsklife.com/filespath/files/20210908172901.pdfIn PDF document text
    • http://ceroki.com/image/files/bijikudibefu.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/saxifofipirazafuvotalomur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=cast+from+pc+to+tvPDF 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_off0000cb8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB8D 17580 bytes
SHA-256: 6c1ff6f9f383e21506079de6e1e3edf4f600850345cd2451399756d7849328e0
font_01_sfnt_off0000f940.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF940 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011157.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11157 10364 bytes
SHA-256: 443a954c6d212198819b8037ab3ebe1b06bd8b5854f038d7f4e3103f527372fc

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