Malicious PDF — malware analysis report

Static analysis result for SHA-256 eccc26dd26dd8eb6…

MALICIOUS

PDF

70.7 KB Created: 2021-09-24 17:12:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b8bd5a309b3a55136bbb6471914906fd SHA-1: 982b5fa9a8111145b52c3de4ba6436b56d4eff02 SHA-256: eccc26dd26dd8eb62675ac15cecd4ba7882059180bb6160fb71c3439b0cc7fa5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs that form a link farm, pointing to various domains, some of which are hosted on compromised CMS platforms. The presence of these links suggests an attempt to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://philabc.ru/uplcv?utm_term=4+letter+word+starts+with+e+ends+with+s PDF link annotation
    • http://bijverhoeven.nl/uploads/files/83419089463.pdfIn PDF document text
    • https://adrfarysz.pl/userfiles/file/9792663345.pdfIn PDF document text
    • http://nenayu.com/filespath/files/20210920235927.pdfIn PDF document text
    • http://bobiniauto.com/userfiles/file/76797367936.pdfIn PDF document text
    • http://www.accessibilite-salle-eau.com/ckfinder/userfiles/files/vikuvasotaxe.pdfIn PDF document text
    • http://autobedrijvenindex.nl/images/uploads/85591343608.pdfIn PDF document text
    • http://co-wemart.com/careeruserfiles/file/jarubasetelagob.pdfIn PDF document text
    • http://antoniolescio.net/userfiles/files/natoze.pdfIn PDF document text
    • http://cainghienbinhduong.com/uploads/userfiles/file/67362264681.pdfIn PDF document text
    • http://emaaravm.net/upload/files/dawivepimu.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/161391e66e26f4---94115706803.pdfIn PDF document text
    • https://genesisbehaviorcenter.com/wp-content/plugins/super-forms/uploads/php/files/579cd8639cb7095139fe4f5a93ba3615/lutege.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///80978636280.pdfIn PDF document text
    • http://masonhn.com/d/files/mamolulibiserowobapef.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/15359538883.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/51328665101.pdfIn PDF document text
    • http://myphamlulanjina.com/upload/files/87187165823.pdfIn PDF document text
    • http://vaynhe.com/upload/files/gitoguzuw.pdfIn PDF document text
    • http://turchifiltri.com/userfiles/files/xasomekugatukonaseturuxin.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4e721955---40307626066.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1614a0532936f2---vebujuvevulakibisejagiwu.pdfIn PDF document text
    • http://jobcred.com/rk/jobcred/uploads/image/file/lapitesutarotunalosenokab.pdfIn PDF document text
    • http://lexen.ca/userfiles/files/soxewomixiluta.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/62019724958.pdfIn PDF document text
    • https://ethnicminorities.heephong.org/ethnicminorities/cmsadmin/ckfinder/files/29320357401.pdfIn PDF document text
    • https://granitabrasive.hu/editor_up/tizidu.pdfIn PDF document text
    • http://rungrawin-itt.com/userfiles/files/relazivume.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/18527798819.pdfIn PDF document text
    • 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_off0000b372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB372 15828 bytes
SHA-256: 972b7c2fbcb8b62e11884832a4c033cf7da65f808b80587d1861b73adf4206c6
font_01_sfnt_off0000db91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB91 10412 bytes
SHA-256: 11d872069fcf4900d54a7873be81dd531942cb838979d20592045edcdfceab6a
font_02_sfnt_off0000f325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF325 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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