Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c618d9bf5d32bfd…

MALICIOUS

PDF

69.7 KB Created: 2021-09-26 17:59:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80744131703f77299567911d8950126a SHA-1: 6b4e9562ce636d69faa18b4346a802083f6491ce SHA-256: 2c618d9bf5d32bfd5d9ba033ccc1fd4524c33a8305edd7174c16cfff3e181f0e
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to manipulate search engine results. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content but the structure and heuristics point to a malicious link distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/d0ac477881294dba15a40669e37849ed/watajozedoro.pdf In PDF document text
    • http://creative-format.com/upload/editor/files/levagavubogitapa.pdfIn PDF document text
    • https://happen.webasl.com/userfiles/file/fikibinarozaxodinu.pdfIn PDF document text
    • http://vitrine-prof.com/files/4777860077.pdfIn PDF document text
    • https://norservis.cz/files/files/buvofafedil.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/fukalokexasu.pdfIn PDF document text
    • http://partnerplus30.ru/images/fornews/files/papuxifexafizivura.pdfIn PDF document text
    • https://www.truck-transport.com/ckfinder/userfiles/files/36121440091.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/ferelobito.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/xowewot.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/takunaxabimogabipi.pdfIn PDF document text
    • https://sapporopools.com/contents/files/dazadogibilososojelalojan.pdfIn PDF document text
    • https://autotrilogy.com/wp-content/plugins/super-forms/uploads/php/files/e82261eaa01766f33665ce9f39c7fa42/32551579282.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317df6c62e3---zetexikiroko.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/jobutara.pdfIn PDF document text
    • http://dhleisure.com/ckupload/files/talubafojadizelobunixi.pdfIn PDF document text
    • https://gamepinleri.net/calisma2/files/uploads/1837197972.pdfIn PDF document text
    • https://campermagazine.tv/public/file/66815442086.pdfIn PDF document text
    • http://erdbau-rauch.at/58333507348.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/71243865192.pdfIn PDF document text
    • http://pivotal-technologies.com/userfiles/file/25986585567.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/bekapepib.pdfIn PDF document text
    • http://ordineveterinarireggioemilia.it/userfiles/files/rolizufobok.pdfIn PDF document text
    • http://koala-al.com/d/files/44453764299.pdfIn PDF document text
    • http://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/weparojobidovudojonejad.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161456bfc556e4---wupojatiwodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=subway+surfers+free+play+no+downloadPDF 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_off0000b127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB127 10816 bytes
SHA-256: af1fa2ebb4cebab0c442067cb2fc129e88a2f3172f9073c4d6184cb3ad6d87ee
font_01_sfnt_off0000ca0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA0D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e21f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE21F 14848 bytes
SHA-256: d8710c40142841f4f847e51a85bdbd2e780c7248915167c8283350a5f72a3f7c

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