Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e39478578c0ba59…

MALICIOUS

PDF

99.7 KB Created: 2021-07-13 15:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: bf8716ec301a40709d4176dce3330deb SHA-1: 4ce910cfbbc6b979776519e76c7a57c3fe30ff41 SHA-256: 9e39478578c0ba59dcdb2560ed5236d496b2421c58daef2abda31ffd3d011553
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to compromised WordPress sites and other domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a common tactic to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9839

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://irlanc.ru/uplcv?utm_term=hydronephrosis+meaning+in+marathi
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/f686249197d59815f1727e74dd1b7821/90519577493.pdf
    • https://floridaholidayplanner.com/wp-content/plugins/super-forms/uploads/php/files/f3570d7b2dd76fb35b6cd26e9c9aa4df/joxatarino.pdf
    • http://sshs1962.info/clients/3/33/33dcd814b32da85629335a95ab3d0158/File/lovunekane.pdf
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/68509a8441edff146ba69e02a10b1c06/fapuziwusipuwikut.pdf
    • http://nkcophs50threunion.com/clients/0/01/014062e559e26c1cf0711bcec4e573ae/File/bexutofugopofebakewasew.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b21e0726---xutigarupidexime.pdf
    • http://alpanelektrik.com/depo/sayfaresim/file/20296387171.pdf
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b5d86c6177b---raxan.pdf
    • http://tktravel.shop/FileData/ckfinder/files/20210602_DEAFF4F95DCC9E9A.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/6a150fed665441968d9934e0bf6da703/degiziguvizumotinesu.pdf
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/90918554093.pdf
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/025eb8f0029931cc4daa9182f2c28586/zogafejoropumawuxer.pdf
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5b7b559210---39888172371.pdf
    • https://best-label.com/upload/files/putewapenoj.pdf
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb703721e14---56893238036.pdf
    • http://jatyn.cn/upfiles/202106/file/1623091647.pdf
    • http://adabaskimerkezi.com/upload/file/zupawa.pdf
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b04a927a602---69921444061.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/4e9f8722f1d19f1c1f45d3617e9fb429/32804377909.pdf
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9cd65a038---38930130977.pdf
    • https://ckmusicdesign.nluserfiles/file/magewuwazerutezapolajibok.pdf
    • https://ccveg.org/wp-content/plugins/super-forms/uploads/php/files/aggoel8gkvogj4niprqi45or32/gekomilukelejevade.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f535.bin
c9c6d86fe9cb7b62abdb27dc7f5fa4ee6d389533b58c5fa7631d48c817bb193e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF535 20620 bytes
font_01_sfnt_off00012a4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A4E 16792 bytes
font_02_sfnt_off0001425b.bin
b6eb415eab7e8f2100b1341ff76142488322ee7de0da0cd32d71e1158d73bcfc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1425B 2560 bytes
font_03_sfnt_off00014d4d.bin
398532e0c9d899777fa9c1364c8d31d154e4eafc82ec192e1e09715676a45c84		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D4D 16976 bytes
font_04_sfnt_off00016609.bin
efcbdf8b56a49922fc8155e6cad2027090a2b57efd921dfaac06474b11203f8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x16609 10896 bytes

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