Malicious PDF — malware analysis report

Static analysis result for SHA-256 75c02b533c66bcfa…

MALICIOUS

PDF

108.1 KB Created: 2021-06-14 05:24:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: aaa646dfc2189d48bef4271e50bedb65 SHA-1: 7fec64156dbd0e1548846c7536e255868640cb97 SHA-256: 75c02b533c66bcfab8276ff277745acc0048897b9cb5373790aedf22f8f979fe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous external URLs, many hosted on compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or conduct phishing. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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 https://synerhu.ru/uplcv?utm_term=dragon+ball+budokai+tenkaichi+3+wii+iso PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16094b28da3bae---29292066441.pdfIn PDF document text
    • https://www.hediyevideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b71119e49f0---zadubuwugofenuka.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/45109826998.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160721931ecbcd---46502649737.pdfIn PDF document text
    • http://broadmoor79.com/clients/864886/File/didudefumewono.pdfIn PDF document text
    • https://andrejc.si/files/file/domomubonevobowowilididar.pdfIn PDF document text
    • https://mmszke.hu/files/file/xabupapox.pdfIn PDF document text
    • https://acronimocostanzo.com/userfiles/file/tituwaxu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/34o4c604tudk0m5i9odh3h8je5/wikixewofali.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860f6c3d3ea---radogubumigimibidosudido.pdfIn PDF document text
    • http://edgecs.net/documents/38803730338.pdfIn PDF document text
    • http://arci-mp.fr/admin/File/93729659217.pdfIn PDF document text
    • https://www.marvistasales.com/wp-content/plugins/super-forms/uploads/php/files/7501f767117f099871de3b550af04254/jazisobogum.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/fd81245a92f29988ee3f27ec39d5c55d/45479113316.pdfIn PDF document text
    • https://www.waterlooarmsnewforest.co.uk/wp-content/plugins/super-forms/uploads/php/files/3ca4d8b495efaff03bfbed4c6834368d/10590148641.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e4e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4E7 31864 bytes
SHA-256: 9b32cd6e0944d60086cc3edcc85c1aa5c7bf3162278d7bf17013a16d35abfbd4
font_01_sfnt_off00014828.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14828 5660 bytes
SHA-256: 0e485909fd28250f75661220d2e1fbec8a9768bc473d2638105c9e2072e98033
font_02_sfnt_off00015b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B6E 3648 bytes
SHA-256: 5deedea67faf4700ab2275527717dd9594bb2031fbccdd059991b7c4a78f5ca8
font_03_sfnt_off000168b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B9 11048 bytes
SHA-256: 871f0c40eaa1060544ff20efae5aa889d43cf71ef4b4789bb5dcff10a8befbb7
font_04_sfnt_off00018d95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18D95 16036 bytes
SHA-256: 149cab45689013e99d1aa520d2e5234663aa5d8577b6aae5e423b5d60aeda4c1

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