Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcfeaaa0787c67ff…

MALICIOUS

PDF

86.2 KB Created: 2021-07-14 04:27:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 90fe40f4159da76b7cb477c8651cfaf0 SHA-1: 656285e500751c8c491c6d3c0daf566d0392c44b SHA-256: dcfeaaa0787c67ff574977e5507a6da7bd7bba828c2f42a25bb3e2d54c103bff
104 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The numerous external URIs, many pointing to compromised WordPress sites or disposable hosting, suggest a link farm designed to redirect users to malicious content. The ML classifier strongly indicates maliciousness, supporting the conclusion that this PDF is intended to deliver a secondary payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://queure.ru/uplcv?utm_term=virtues+of+a+hero PDF link annotation
    • http://wingmanplanningdemo.com/userfiles/files/40231252158.pdfIn PDF document text
    • https://almoheetmanpower.com/public_html/userfiles/file/356478750.pdfIn PDF document text
    • https://www.eoluk.com/wp-content/plugins/super-forms/uploads/php/files/886p1t7s9u4upcdc4ooeqgso6r/18684933532.pdfIn PDF document text
    • http://andreaslasnik.com/data/files/tajigurezadoti.pdfIn PDF document text
    • http://cuhs1981.com/clients/8/82/82ca37c076ec4232796cb58ed009bb3a/File/68122596393.pdfIn PDF document text
    • http://ugrctrani.it/userfiles/files/9865489506.pdfIn PDF document text
    • https://www.mnspineandsport.com/wp-content/plugins/super-forms/uploads/php/files/87f52248e6e17d74f6857bcdec244c67/54213492618.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/46334852734.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/30dbe0772bf2e3996f7fe04ebe8a6bb5/85620423969.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/da3b04703ceabfdd033456851d51857c/81865802692.pdfIn PDF document text
    • http://raunlarose.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607b898575390---nagazolosa.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/62043d836fcb921d16ac3343b1cba169/kugepaxupokusumov.pdfIn PDF document text
    • http://maxgear.cz/webpagebuilder/ckfinder/userfiles/files/dulus.pdfIn PDF document text
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/5cb559ebdce4b77a5d5c421ead559729/23637382173.pdfIn PDF document text
    • http://www.apsetedavisi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756fa361f97---31636776020.pdfIn PDF document text
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc209f7e8e1---zusivumiwoduwoxuwaxitiki.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/8f162d502bca6372ac25e5956d510127/jopazupav.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/17079926665.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/2696edc85903fb637e718ea6b4cd39ba/kikuvenonugirebefuti.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/rkuvn69048o6a9thl599rt0nh1/49880245471.pdfIn PDF document text
    • https://advance-pack.com/editor_upload/file/43210234222.pdfIn PDF document text
    • http://nensi.si/upload/file/lezilu.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fe7872cb65---vufolesuxamudavexiboxosop.pdfIn PDF document text
    • http://goodwill.as/userfiles/file/18970167473.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_off0000ef11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF11 10228 bytes
SHA-256: 6113d9ff071c2e8cae9c6d8b2363aee79c8338e90171f4cdbf37f1b8c29118a2
font_01_sfnt_off00010641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10641 17304 bytes
SHA-256: 430f54b7be3d4a4ba697f909db36886e0c3193cd2fcbb3ed7593c2a16a7be212
font_02_sfnt_off00013386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13386 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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