Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a8a6ba5146a8bd2…

MALICIOUS

PDF

79.8 KB Created: 2021-09-12 07:56:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: a10cc16d634f2151eaa88defcb5b059a SHA-1: b2bf1081c6c08ea15aa006ebfd37151f4f991854 SHA-256: 2a8a6ba5146a8bd2435bddda0131be823ae44c1164e01b09af267167459e185a
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a high ML score, ClamAV detection as a phishing trojan, and a lure for a password-protected archive. The document body is heavily obfuscated, but the presence of a 'download button' lure and links to potentially compromised sites suggests a phishing or malware delivery attempt. The primary goal appears to be tricking the user into downloading a password-protected file, likely to bypass gateway security.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://saikekanglun.com/filespath/files/20210906145020.pdf In PDF document text
    • https://keluargamimpi2.com/contents/files/voxevizugazexasizaruwib.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/70394860679.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/zotedotisogobuzavuvo.pdfIn PDF document text
    • http://daeryuhealthcare.com/ckupload/files/wikutawesasawe.pdfIn PDF document text
    • https://cribpointonline.org/cribpointonline/userimages/file/bunuwibejolaxexavisada.pdfIn PDF document text
    • http://aktifbant.com/resimler/files/58944893840.pdfIn PDF document text
    • https://penzionradvanice.cz/res/file/75060114647.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/0536a6c5787a877c963eb218deb90ed4/lelajozerurodoguweti.pdfIn PDF document text
    • http://pokebarslo.com/uploads/files/83791518487.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/87494477350.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/95832830211.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/moxibomudoso.pdfIn PDF document text
    • http://livelyway.com/ckfinder/userfiles/files/fulojuziwerudaba.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/kewudetikilez.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/5010b4325758ea44594607efb410069b/5490130879.pdfIn PDF document text
    • http://uhorder.com/upload/files/58050155962.pdfIn PDF document text
    • http://technoprofile.ru/userfiles/file/48477282972.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210901174640.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161376ae4b08f4---voloxozes.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/gakivexem.pdfIn PDF document text
    • https://atrax.eu/userfiles/file/18651617086.pdfIn PDF document text
    • http://propertiesforrent.com/userfiles/file///xusiw.pdfIn PDF document text
    • https://cincia.ro/ckfinder/userfiles/files/70598143657.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=win+10+lite+isoPDF 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_off0000d01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD01F 10008 bytes
SHA-256: 06868cfbf3cca19558cdafd05322e3b809f46c15e4954b57208649c2754037a9
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE96 19540 bytes
SHA-256: 71cc69f15bcb31e8603a9efa6d3d21bba06287767a95738dc991317c089a2848

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