Malicious PDF — malware analysis report

Static analysis result for SHA-256 c874f82bfee155cc…

MALICIOUS

PDF

84.7 KB Created: 2021-09-02 00:27:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7e7bc287df0554e2d27d394bac5551d2 SHA-1: eaf6655479d835f7a615390edf825af7ea289038 SHA-256: c874f82bfee155cc2c42223e444db7cd84e85dd6a26bf7f279e7e4ae8c6d30ad
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, indicating it likely exploits a vulnerability or contains malicious content. The heuristics reveal it functions as a link farm, directing users to multiple external URLs hosted on potentially compromised or disposable domains, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the PDF structure and URL patterns are indicative of a malicious payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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 http://vimar.ua/userfiles/files/futofeporavusozinal.pdf In PDF document text
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/2cf19382340bf31eb47315ff5440b31e/1483514501.pdfIn PDF document text
    • http://abnicum.com/files/file/14114258056.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f11b1f4ed---91320869801.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c9fbef125---dujusulut.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160ab0857a88f6---fozukekawepa.pdfIn PDF document text
    • https://rumusjitu.com/contents//files/96862436316.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021718164538877.pdfIn PDF document text
    • http://qhchemicalsfeed.com/upload/files/54944805590.pdfIn PDF document text
    • http://chekeeh.ir/basefile/chekeehir/files/78970849927.pdfIn PDF document text
    • https://gauravkankariya.com/wp-content/plugins/super-forms/uploads/php/files/gq0ou0t2ppp8benbsg261m21m2/80270837142.pdfIn PDF document text
    • https://completecollegestrategies.com/wp-content/plugins/super-forms/uploads/php/files/896713f6357cb43c24c7fd01d049cb36/90513821730.pdfIn PDF document text
    • http://efuturesthai.com/uploads/files/95922253290.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160932b93c2d27---949235134.pdfIn PDF document text
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/bupujuvokerewawuzemodo.pdfIn PDF document text
    • https://kaemsp.org/upload/editor/file/93126982242.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/13884020620.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/5409977628.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/c538269b0f5118db779a279614b127e3/76249924566.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4311590132---vadejomojoponizatemifedum.pdfIn PDF document text
    • https://makenie.com/upload/files/kudojesazi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb3f1445972---53016754320.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1625126664.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/36c29331675f6a9584a90ff1a6e5a3ec/26208371362.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=after+the+summer+has+gonePDF 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_off0000e2e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2E4 18936 bytes
SHA-256: 6d88ad2088a9c1ffdbb69c755436de084ee8c07a0e392732d9660600489eeb0f
font_01_sfnt_off0001149e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1149E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012cb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CB5 10604 bytes
SHA-256: 2aa40b2fdb3a7f292e36da7c77ff919737ffdf7b38b4d771f54c80164be8a547

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