Malicious PDF — malware analysis report

Static analysis result for SHA-256 4a3eadc5512c40d0…

MALICIOUS

PDF

86.9 KB Created: 2021-09-07 12:33:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 59ec43040d36120384b859a523fba513 SHA-1: 99b7a2dc945fb3ee327ee27a1beff878cfd97e02 SHA-256: 4a3eadc5512c40d0025d6067966c0e6b82392a949dbd9ba774d19c082e27edf0
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm for phishing or malware distribution. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing campaigns that leverage deceptive document content to redirect users. No scripts were extracted, but the overall structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://archism.ru/uplcv?utm_term=queen%27s+gambit+accepted+pdf PDF link annotation
    • http://casaperferiesantamariagoretti.com/writable/public/userfiles/file/82763414420.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/916a50055553b85557b1e7f1b7bc8312/63051195536.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/000c6945cd3f53ba46a22a8ef69da209/ribigupuk.pdfIn PDF document text
    • https://accuratesearch.com/userfiles/file/47787933933.pdfIn PDF document text
    • http://cmuniontravel.com/userfiles/file/22282501104.pdfIn PDF document text
    • https://choiceenergynetwork.com/wp-content/plugins/super-forms/uploads/php/files/2caab83231dcf7195704382ff88d27b9/7773846850.pdfIn PDF document text
    • http://asiavent.com/UserFiles/file///vuxexokakijugatokipelit.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/37746862813.pdfIn PDF document text
    • https://connatlas.com/home/conn/public_html/ckfinder/userfiles/files/kabefodaw.pdfIn PDF document text
    • http://canphantich.net/Images_upload/files/fagunufogumi.pdfIn PDF document text
    • http://thevisionkharj.com/userfiles/files/sulinujakuposusug.pdfIn PDF document text
    • https://ubitanduk.com/contents/files/dononukiropodowibeg.pdfIn PDF document text
    • http://www.syrahresources.com.au/application/third_party/ckfinder/userfiles/files/99553668422.pdfIn PDF document text
    • http://krakow4you.pl/krakow/files/nujozumek.pdfIn PDF document text
    • https://andhimazhai.com/images/files/95019458853.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2b6228f63c1cf8984e00fe8387a72c08/96085339202.pdfIn PDF document text
    • http://schodylux.pl/userfiles/file/ropatojewuma.pdfIn PDF document text
    • https://www.chortho.co.uk/wp-content/plugins/super-forms/uploads/php/files/6bpo2392ndf4uc6mk5n1acf77o/bomorolepuraz.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/xamaditejusenubum.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160acf50c624d9---bipifovojidit.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/974b0b8d736de628ce27a80bceee9454/wudiwekivosoturuke.pdfIn PDF document text
    • https://bbensonmft.com/wp-content/plugins/super-forms/uploads/php/files/2982197d41d76d6779d86ad8f15ef863/demexifolaxinufigageno.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/72631610864.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_off0000ecb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECB6 18404 bytes
SHA-256: 50739f81d81b2ac4ec21cabe96935b04563ca03c744a53047efbb161dd995787
font_01_sfnt_off00011c87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001349e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1349E 11032 bytes
SHA-256: fc4e0c294c9c72f1351be02619900f1db66f06eaa7ace02b5eb147ccd3c95d59

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