Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd0e6681486c0fd0…

MALICIOUS

PDF

91.8 KB Created: 2021-09-06 05:02:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 211d3323125d5094465557c96c3cc8f6 SHA-1: ae5a4c727c9000e148f97352ed5b87b658c0bc38 SHA-256: fd0e6681486c0fd087c030c7f05a08d7cf692f2d1aad1655cc0f40592a1adb81
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, providing no direct user-facing content but serving as a vessel for the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://kopdesign.nl/userfiles/file/junuwit.pdf In PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/7fc61edcf5c35817d9b6fbd3d6599a75/kavimugemesuk.pdfIn PDF document text
    • http://teaandtiarasottawa.com/clients/e/e8/e8f54e69a7463df9fd0adff13cd8e90f/File/19454061578.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/j27jditfmpig7514t9du9kjrgs/3363809469.pdfIn PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074dc44d6db6---66555711485.pdfIn PDF document text
    • http://www.teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/19071175856.pdfIn PDF document text
    • https://gwynharmon.com/home/gwyn/public_html/ckfinder/userfiles/files/98731329606.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/ab7683b83d309865ebc96e47bc4dfed5/wegutuvogulexebafebe.pdfIn PDF document text
    • http://wefocusdesign.com/upload/files/88598160053.pdfIn PDF document text
    • https://ecoretras.com/file/razuzi.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/47187040815.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/tumeworufevin.pdfIn PDF document text
    • https://www.schroedersales.com/wp-content/plugins/super-forms/uploads/php/files/3b17d2bcdf30645de02f70f6ee7cc26d/jegalizutasilazuzov.pdfIn PDF document text
    • http://logistra.fr/ressource/site-image/files/44542392605.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/85367592725.pdfIn PDF document text
    • https://kueapem.com/contents/files/vawivetavona.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1606d40410da3c---pepefixajazutumefufifi.pdfIn PDF document text
    • https://roc.mn/uploads/files/42723419186.pdfIn PDF document text
    • https://biorenta.lt/ckfinder/userfiles/files/70032438581.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/jisasidukekigowivapizov.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/52330523279.pdfIn PDF document text
    • https://sitpchemcieszyn.pl/_sitpchem/file/21783268186.pdfIn PDF document text
    • http://studiolegalebisantis.it/userfiles/files/60533012707.pdfIn PDF document text
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/a705986288fa6492e8e56024cfb44064/76822575671.pdfIn PDF document text
    • https://sportnazona.bg/f/uploads/files/91571935721.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=midland+g4+walkie+talkie+owners+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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010317.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10317 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011b2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B2E 10940 bytes
SHA-256: 7540d23a021e6dbd9a07ddf0245d29e1c89f63e5d8517fb6772eb4bfe1d29128
font_02_sfnt_off0001346a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1346A 17376 bytes
SHA-256: 0434aba101a7eb795ba14c0405ccf68b917471e00e49d08cdc24a352cf426d80

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