Malicious PDF — malware analysis report

Static analysis result for SHA-256 b09cb5b55cc09585…

MALICIOUS

PDF

80.5 KB Created: 2021-09-21 15:05:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: ebc37eba351c84a1a8295dbf7077a7a8 SHA-1: 7ea6f5ed2e93e7573dea87b9170c8e299ab1b73a SHA-256: b09cb5b55cc095858a4598498a1607c94610c729b7152fa2926d507814723f57
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm, with many URLs pointing to potentially compromised or disposable hosting. The document body is heavily obfuscated and unreadable, suggesting it is not intended for direct user interaction but rather to facilitate redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.ufolep-69.com/contenus/files/32925984104.pdf In PDF document text
    • https://ncfouting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16145b01dc01c6---39874520942.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/13563310483.pdfIn PDF document text
    • https://prestinieurope.com/userfiles/files/72496420415.pdfIn PDF document text
    • http://firegallery.ru/img/upload/kavesilamemizupebod.pdfIn PDF document text
    • http://guowangcable.com/d/files/86545331594.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/18491414849.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/45329670446.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/23451756918.pdfIn PDF document text
    • http://artospace.com/pics/file/89485709409.pdfIn PDF document text
    • http://retailcop.ca/files/zidimewupeminul.pdfIn PDF document text
    • http://esteel.my/userfiles/file/ladasarelav.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/44035604301.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/77772040827.pdfIn PDF document text
    • http://tochuchoinghi.org/files/xeputazezefikafodop.pdfIn PDF document text
    • http://studioprogettoarchitettura.eu/userfiles/files/36806512872.pdfIn PDF document text
    • http://ingegnasrl.com/userfiles/files/43255809071.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/daa9ca824964426fa44f00147c4a2ee7/49521601816.pdfIn PDF document text
    • https://autotoner123.com/home/autotone/public_html/ckeditortest_WORKING/ckfinder/userfiles/files/loroge.pdfIn PDF document text
    • http://tencanpowder.com/d/files/fakujipenunifogorizasud.pdfIn PDF document text
    • http://barudan.hk/UploadFile/file/20210912183647888.pdfIn PDF document text
    • https://vannordenvastgoed.nl/userfiles/file/wusekegigoliwatalul.pdfIn PDF document text
    • http://teleinwestor.pl/userfiles/file/14753461666.pdfIn PDF document text
    • https://shturnev.com/files/foFKED/file/88560152686.pdfIn PDF document text
    • https://vico-inmobiliaria.com/ckfinder/userfiles/files/96528480806.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/ati8kttps14do199gp5goomcsq/kexalobo.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/94077708252.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=movierulz+123+2020PDF 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_off0000d808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD808 17196 bytes
SHA-256: 1e4755096e653c7ac348403ead7e037e7480d0179af1f528887449db840383c0
font_01_sfnt_off00010482.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10482 10252 bytes
SHA-256: 0e4f242f084546b6db8f22b3b92badc07e05ece315658c658716d63084181e43
font_02_sfnt_off00011bcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BCC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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