Malicious PDF — malware analysis report

Static analysis result for SHA-256 5038c7715b4f3068…

MALICIOUS

PDF

85.1 KB Created: 2021-06-28 21:28:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c296c900a7d0d3b1ba0d198aa6317585 SHA-1: 60741f9dd01f4fe71fb4326ffe8dec391700099b SHA-256: 5038c7715b4f30683eefb6cc716c4149d8b5f32a22a42d19d52421a0be83512a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as Pdf.Phishing.Trojan. The file contains numerous links to external websites, many hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://infrive.ru/uplcv?utm_term=wide+grip+upright+row+dumbbell PDF link annotation
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/u504pl9oro5fvm7m1t8b0peiu5/gagakozasitejexumepurak.pdfIn PDF document text
    • https://sitebyside.ru/wp-content/plugins/super-forms/uploads/php/files/41fd55b3d3fe5a1754b2c451c678bc62/wiguvusipepixuvomexegaded.pdfIn PDF document text
    • http://stroisvias.ru/userfiles/file/94346257626.pdfIn PDF document text
    • http://srihemkuntsahibfgp.org/hemkunt/userfiles/file/xarovolipodewukara.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1799927292---25588832573.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/gi31ogjidp6klkta1n4q7di0l3/25499442684.pdfIn PDF document text
    • http://darec.sk/files/files/manisowojubuv.pdfIn PDF document text
    • http://ashioke.com/images/library/File/14544029306.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/79611778540.pdfIn PDF document text
    • https://www.msolartop.cz/wp-content/plugins/formcraft/file-upload/server/content/files/1608373c366526---pumipekisam.pdfIn PDF document text
    • https://anpheatingandac.com/nbloom/fckuploads/file/tafevatiduje.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fd8bf832e296f6d7493c51dad81cb10b/51083772333.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/160905109ad115---butinowisega.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607069cca804d---50861331212.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/aaee5d62cbc596918bccc9e2813b7073/44009341286.pdfIn PDF document text
    • http://israel-aliya.com/wp-content/plugins/super-forms/uploads/php/files/fc8c83bfdcdb230f4968a014b9bd38fc/bijivexiwule.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3229314b60---wukegavadu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/4f8cc6d610b98af201d7c66ef5d63eb9/pajisate.pdfIn PDF document text
    • http://dansecyr.ca/pdf/file/limalezalafem.pdfIn PDF document text
    • http://kehlux.lu/userfiles/files/pomunasif.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae504dd664a---fivukilomavozo.pdfIn PDF document text
    • http://cricalliance.com/wp-content/plugins/formcraft/file-upload/server/content/files/160942f60499fa---javobawiwumomitib.pdfIn PDF document text
    • https://edusfera.pl/upload/file/gududadopudipebaverewaf.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_off0000ec0b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC0B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001041d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041D 16764 bytes
SHA-256: 055e46056ef0e6336d0911e3169d50d540dfd4742aa781d2cf5b005fec885b31
font_02_sfnt_off00012f2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F2E 10724 bytes
SHA-256: 3a6439ca345e2282d997ef59dc8701fdf71335041c632be665764cb4bee60c49

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