Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a04bbce1579969a…

MALICIOUS

PDF

85.8 KB Created: 2021-10-12 11:44:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 5e42250a005c2248cb1dea0f01bfeb22 SHA-1: 2d382cff2dc5c6b06fe4f05ac8840224f5656e16 SHA-256: 3a04bbce1579969ab412e1d2a84929c0f26c46e3df54fbd4b1c1539a51581357
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. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware delivery. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://spain-ex.com/images/blog/file/geduzefugepajamujonup.pdf In PDF document text
    • http://khonggianxua.samdigroup.vn/app/webroot/upload/files/71645864124.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/161633f6c1a1bc---menefubupuwalojiroxe.pdfIn PDF document text
    • http://fra2ange.it/userfiles/files/9715638273.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/9e25942103c225f0a78c4236ac95f6d4/vupuzed.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/80roq3hfnl35vr5qkh1o9ibe4q/xezewozufujifumititosilix.pdfIn PDF document text
    • http://ajambary.com/userfiles/file/72100740225.pdfIn PDF document text
    • http://hacoauto.vn/upload/files/5599112250.pdfIn PDF document text
    • http://handgun.ee/media/file/zutijaduneruralesiduwowa.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/98100120357.pdfIn PDF document text
    • http://jiab.net/userData/board/file/tinudijijakuwuj.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149d933eb294---89006354406.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/f6f7b657caa09155fa34e807bc74155b/83669294274.pdfIn PDF document text
    • http://culvercity.ilovepokebar.com/uploads/files/mekisabuwi.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/78635776227.pdfIn PDF document text
    • https://birutelorasin.com/contents/files/tuvinuwiwu.pdfIn PDF document text
    • http://wksx.top/images/userfiles/file/zomefubuxoj.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/fupozefoborav.pdfIn PDF document text
    • http://tabbanbros.com/admin/fckeditor/editor/filemanager/connectors/upload/file/82205227403.pdfIn PDF document text
    • http://surtek.biz/image/files/20150412_062132.pdfIn PDF document text
    • http://tongchangkj.com/uploadfile/file///2021090321512133.pdfIn PDF document text
    • http://milkyway-vn.com/upload/files/xowuw.pdfIn PDF document text
    • http://kaupa.cz/userfiles/file/gorabopuro.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/10063935811.pdfIn PDF document text
    • https://larustt.com/upload/ckfinder/files/wirenumelituri.pdfIn PDF document text
    • https://retake.dk/ckfinder/userfiles/files/degesekopanina.pdfIn PDF document text
    • https://ags-car.60km.com/upload/files/48704384029.pdfIn PDF document text
    • http://feedproxy.google.com/~r/MbOu/~3/RhDyTiV0TgQ/uplcv?utm_term=chapter+7+ionic+compounds+and+metals+test+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_off0000e3ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC06 11048 bytes
SHA-256: a317482f0624a27bd10036a8d7d5ce4c38f6e51fdc3249ad36b75b80fb258ed3
font_02_sfnt_off000115af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AF 19680 bytes
SHA-256: d22b9adb2c09ce47e9b24d688cc7508113f65786abbe965154e9d038787b6f6b

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