Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc69cbf226ba7d5d…

MALICIOUS

PDF

76.6 KB Created: 2021-09-02 05:02:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 5c0e4f9a3bf0f7642383813058694096 SHA-1: 9e94e8ccf907594086df7160f3a4c8510ab2fa20 SHA-256: fc69cbf226ba7d5dd304ab9091c04d52b8b0439cc48c35fb63240830de24fd60
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF sample was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. It contains embedded JavaScript and numerous links to compromised websites, suggesting an attempt to redirect users to malicious content or download further payloads. The presence of a 'download button' lure reinforces the phishing and exploitation intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 8

  • 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.
  • 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 http://baodieptailor.com/uploads/2021-07-10/images/files/lefimuxudaxepexunegiloj.pdf In PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1609896f360a0c---38491815121.pdfIn PDF document text
    • https://condominiobrisasdelnorte.com/userfiles/file/27753714241.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/2hp55et4shdsvkrotv2p53qvmj/jadobaxizotato.pdfIn PDF document text
    • http://ahkjt.com/upfile/file/1166762893.pdfIn PDF document text
    • https://aplusadvance.com/naver_editor/data/file/gidofafixanelis.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609935afc6b7b---wafoxaxedaxotoxafiniveva.pdfIn PDF document text
    • http://www.deep2001.com/images/library/File/kegejila.pdfIn PDF document text
    • http://www.ddd-iasi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16097942491d9c---92988658814.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/goparotawugukidizesagu.pdfIn PDF document text
    • https://octvads.site/js/ckfinder/userfiles/files/39061955998.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/io6qg2ejoq7eeq3ed864qil45h/bewuf.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/09da17164adcf64939b4feb14e69fb6c/27986688527.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/91356282996.pdfIn PDF document text
    • https://lengthening-sldf.com/userfiles/file/63790376184.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160816a61cfe78---mobokuji.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80c02633a---69106000431.pdfIn PDF document text
    • http://allprintusa.com/admin/images/file/bibijuxiwuzaxawatizoxujid.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c70dba4d662---gutibisanimukaxovugenewi.pdfIn PDF document text
    • http://studioarclab.eu/userfiles/files/xirezunokon.pdfIn PDF document text
    • http://asfalon.com/__files/file/40884501375.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/xakobifuxi.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/64653765176.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088016626a78---xuginobobenivuxuzozuxuxij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=basva%27s+farm+class+4+questions+and+answersPDF 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_off0000c5be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 17008 bytes
SHA-256: 56e05a55440915f76f82c7a1d052e0b517df39a8d7d92dbecb65dd78fcd94c79
font_02_sfnt_off0001093a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1093A 11200 bytes
SHA-256: 6124cba89a6fdca92772feb5336c86966fcbbb312215b2853b62982a9fb77f98

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