Malicious PDF — malware analysis report

Static analysis result for SHA-256 83e1bc3ab6765167…

MALICIOUS

PDF

99.3 KB Created: 2021-08-18 07:59:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: a107c952e79c4d729bdcf6a14bba91eb SHA-1: bd8d36de86e78551bf6b863b6ddbe586118975f5 SHA-256: 83e1bc3ab676516742a24c11ac2da93b1d310fd74910469dafe930a45f5ce9f1
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external websites hosted on potentially compromised CMS uploads. The presence of numerous unknown URLs suggests an attempt to distribute malware or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160941fa98dd12---mivukodatefiv.pdf In PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/f4468af47b132ca73e890e20a54ae514/25388901335.pdfIn PDF document text
    • https://www.kindspring.org/inc/ckfinder/userfiles/files/46947379531.pdfIn PDF document text
    • https://studio45.live/wp-content/plugins/super-forms/uploads/php/files/bkvs1r07et9ajpamqlss7jfpm1/73271119648.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609495e9f0779---38501735487.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c4328e9d32---86930255789.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/zixigesuxagimadopivapip.pdfIn PDF document text
    • http://yunnanyingxiang.com/ckfinder/userfiles/files/58834919599.pdfIn PDF document text
    • http://nrnchina.com/test/images/ckfinder/files/vafojebibugetobiz.pdfIn PDF document text
    • http://waterreducer.cn/d/files/47738583462.pdfIn PDF document text
    • https://www.bouldersudbury.org/wp-content/plugins/formcraft/file-upload/server/content/files/160785368cd49f---masitu.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/sonamenisajamerorigejoga.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/6975d84a7de58b223e3e767f9c0d45f0/29641798308.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160833f1f0f19a---79760346900.pdfIn PDF document text
    • http://nuovojob.com/userfiles/files/40085642033.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/99429713817.pdfIn PDF document text
    • http://movietek.vn/hinh-anh/files/numukofekoxerepat.pdfIn PDF document text
    • http://m2mus.ca/clients/b/b1/b1ca46fdb12d68e762e4a8b3318caec0/File/84871380401.pdfIn PDF document text
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16081619c672ef---zexolukozinowipiwuvadazes.pdfIn PDF document text
    • https://mvpartners.be/images/uploadedimages/file/tasilababavobojit.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/82b99bcb866df3b59b54b1388c39c751/39204413864.pdfIn PDF document text
    • https://mkontakt.pl/dat/file/83525236082.pdfIn PDF document text
    • https://okazionche.com/files/moxijapiduke.pdfIn PDF document text
    • https://gencshow.com/upload/ckfinder/files/81947040034.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=arris+modem+tm1602+speedPDF 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_off00011cbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBE 10684 bytes
SHA-256: 4e03253e7accae545851f04803ebe2cd6ffee66d6d9d495d1e53d465205be4f5
font_01_sfnt_off0001355a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1355A 18676 bytes
SHA-256: c79b47b668f41f0309ba2a27f8e01ab9f004d501bf6ffe33ef1c2af486b6be16
font_02_sfnt_off000166a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x166A3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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