Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab67652232589d95…

MALICIOUS

PDF

76.7 KB Created: 2021-09-22 22:24:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: eff586432d2002e95ba2f63517d7b7ca SHA-1: 00232806372f07340bfe21e5e5205c8721ef31fe SHA-256: ab67652232589d95360ab62813dd3ebd150832089bb317a6169dd6aa00c68705
156 Risk Score

Malware Insights

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

This PDF was identified as malicious by a machine learning classifier and ClamAV, indicating it's likely a phishing or malware distribution lure. It functions as a link farm, with numerous embedded URLs pointing to other PDFs hosted on compromised websites. The primary attack pattern involves directing users to these external resources, potentially for credential harvesting or further malware infection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://luminex.pl/upload/file/38458619902.pdf In PDF document text
    • http://emekyesiltepe.net/images_upload/files/89252096510.pdfIn PDF document text
    • https://satesayap.com/contents/files/38951369098.pdfIn PDF document text
    • https://olamare.com/img/uploaded/file/17297666219.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/904923792.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/71144365485.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/80808144676.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/67dc79991cffc1279c645e204d662f84/siwililisawilexoz.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/lepolotixokeboz.pdfIn PDF document text
    • http://aburobocon2019.mnb.mn/uploads/files/80881186530.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/55144868588.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/pixijajowubajunobuvijusit.pdfIn PDF document text
    • http://thekreativecompany.com/uploaded_files/userfiles/files/27085702458.pdfIn PDF document text
    • http://wittymall.com/multimedia/userfiles/file/6525898270.pdfIn PDF document text
    • https://quanghuydulich.vn/img_duhoc/files/43981342190.pdfIn PDF document text
    • https://apatity.verlauf-ekb.ru/admin/ckfinder/userfiles/files/2536005808.pdfIn PDF document text
    • http://metall-press.ru/files/vosoligasox.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613358bd389ce---40153287486.pdfIn PDF document text
    • http://nessium.net/userfiles/file/33625392110.pdfIn PDF document text
    • http://kanchanaspa.com/ckfinder/userfiles/files/49472856175.pdfIn PDF document text
    • http://reklamavysocina.cz/UserFiles/File/67118010883.pdfIn PDF document text
    • http://nagymester.com/userfiles/file/desuvomegur.pdfIn PDF document text
    • https://vivaldiroberto.com/img/files/mediafiles/file/87664416436.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/q3l3drugej3fmfgktj1acj7tv7/88180379033.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/56574935778.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=2+letter+words+starting+with+oPDF 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_off0000c7f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F6 10636 bytes
SHA-256: de2be9132e5331a9f3b074108eb6eb3cb781017dee285df2c4e62c314959dfa3
font_01_sfnt_off0000e01b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01B 17384 bytes
SHA-256: 3ef69a5f911192d6c275ea002eeaed2085fe13c787dc4daacf749bdacec317b1
font_02_sfnt_off00010d01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D01 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1