Malicious PDF — malware analysis report

Static analysis result for SHA-256 0427067e42016293…

MALICIOUS

PDF

92.8 KB Created: 2021-06-29 00:20:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2d090cfa17b815753f4b8027f2192355 SHA-1: c2a65fc7cc30b71d6647470d019629f205c322c3 SHA-256: 0427067e4201629374bbb03e6ba0e7eec0f4d76f1400ec9b0153380a13e9845a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF document contains numerous embedded URLs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The document body is heavily obfuscated and unreadable, providing no direct user-facing content, but the heuristic findings confirm its function as a link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://ketchas.ru/uplcv?utm_term=best+professions+for+rogue+wow+classic
    • http://bazatalty.pl/wp-content/plugins/super-forms/uploads/php/files/baad59c1cc53a9e16deba44776b949e7/xazuropozijemubusagit.pdf
    • https://beaumont-residence.com/wp-content/plugins/super-forms/uploads/php/files/2oaoghp8uooev9p8ckag5pbok6/52906211211.pdf
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160945b94f1187---ganumukulinurovikugofika.pdf
    • http://www.lbf-cosmetics.com/website/wp-content/plugins/formcraft/file-upload/server/content/files/16078854b001d0---61693806190.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/8105fe079eccd4d91c8047aab267c5bf/63311374015.pdf
    • https://deltagroup.bg/uploads/file/25704170725.pdf
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/0f86b1d0ee017d78ba4cd3d7b2f4d117/7575294345.pdf
    • https://www.helpagesl.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4e75769a0---dozujib.pdf
    • http://auroraenergyproject.it/userfiles/files/geruwaturifodiji.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160b0bb4057b5e---jafete.pdf
    • http://paymentsbusiness.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a36bb74a720---bijibup.pdf
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16080b57b04577---litaximijil.pdf
    • https://saftanton.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1608d07da74578---99480909840.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ba8856cce20---delakilanenerajan.pdf
    • http://thehawthornnyc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e12b890875---tiguz.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/edb18842bcc51d7d3cdf02392b4521f7/zupepuwuvom.pdf
    • http://gshosnab.ru/userfiles/file/jepigapebibokebeluzu.pdf
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082017618ab0---beduzis.pdf
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/871baa38efb489160a2c1f06352825e3/xemevex.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160780bb16d710---ziliwogaroxarupuzoj.pdf
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e2beb45bd7---42853059776.pdf
    • https://www.straightmyteeth.com/wp-content/plugins/super-forms/uploads/php/files/0a467965f309598579526452fa1d1784/fusarezobofadituf.pdf
    • http://velo.hu/UserFiles//file/gubexelu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000109c5.bin
8d3a07927ac7f134fcd4a2d18c526ec1fad88fd84a80928e0c13c6f489e75b34		 pdf-font-stream PDF embedded font (sfnt) at offset 0x109C5 16476 bytes
font_01_sfnt_off00013478.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13478 16792 bytes
font_02_sfnt_off00014c8f.bin
7ab7df7a4401f6a2d92bb79034b39826fbc12ce410d7ae6b2a31addf1c2bc804		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14C8F 10896 bytes

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