Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37cd227f981c9bb…

MALICIOUS

PDF

70.5 KB Created: 2021-09-28 06:51:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c8d99fcc6dd54f9fa3d21d8c671e6063 SHA-1: 4e1a2bf9801258334c47e757173b775f5d9ba8e2 SHA-256: d37cd227f981c9bb43da5d63c034af8417ce0ffe3245f30bf541531ac293865c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript, which is often used to execute malicious code or redirect users. The presence of a link farm pointing to various domains, some of which are hosted on compromised WordPress sites, further supports its role as a distribution or phishing vector. The primary attack pattern involves leveraging these links to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://tehpromyar.ru/media/file/84090147642.pdf In PDF document text
    • https://henseltech.cz/userfiles/file/89079605267.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/49010903435.pdfIn PDF document text
    • https://cottonweb.net/userfiles/file/wizutiloxazejo.pdfIn PDF document text
    • https://archielectronics.com/userfiles/files/rifabiwigov.pdfIn PDF document text
    • https://skatrip.com/basefile/skatripcom/files/timopukubup.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ea3b2ef395---57278459651.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/kowowaronofexujedov.pdfIn PDF document text
    • https://nusantarabet4d2.com/contents/files/gumepifojizi.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147e2d1a7c82---jujuniwikedageraxuwepizon.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/86974143981.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/90682555109.pdfIn PDF document text
    • http://bygreenpure.com/userfiles/file/61106827856.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/tajule.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/womotowojop.pdfIn PDF document text
    • http://verynailscm.com/user_img/file/nawadituxemisenopolufaf.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/38061642161.pdfIn PDF document text
    • http://www.kigimex.com.vn/ckfinder/userfiles/files/mudavudekoworuzor.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/edgoehflnj2d6tnfgdflmkuid5/febepavijemelux.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/tegozofotetet.pdfIn PDF document text
    • https://ajansnigde.com/resimler/files/nagef.pdfIn PDF document text
    • http://naturalfurnish.com/userfiles/file/dibimusudotewiginumofetuw.pdfIn PDF document text
    • http://bobmeetin.com/media/galleries/files/12522688875.pdfIn PDF document text
    • https://9ja-bet.com/userfiles/file/16301618626.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=skin+para+osu+droidPDF 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_off0000b0c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0C8 17584 bytes
SHA-256: 7749c9a4d9e38ed7f5aafef1478c84be7259775389e38d1cf9577dafc26402f6
font_01_sfnt_off0000dd0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD0E 10376 bytes
SHA-256: 897386849806abbfd17ceab3983136371c65574aa9e73925b5b84f95ef587c68
font_02_sfnt_off0000f48c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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