Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6776fed5c4e9f24…

MALICIOUS

PDF

86.6 KB Created: 2021-09-12 22:52:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7bac104dfa66fbb0e925110ba7319638 SHA-1: 5268d3db32d48516541cbfef17413f6e262e98a3 SHA-256: f6776fed5c4e9f244d49d01d2d8b145aff99759f43dfdb8b8ec667dceb19176e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users to malicious sites. Several heuristics indicate this PDF is part of a link farm, with many URLs pointing to compromised WordPress sites or disposable hosting, suggesting an attempt to distribute malware or phish for credentials. The ML classifier and ClamAV detection strongly support a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 7

  • 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.
  • 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 http://tatugigo.com/ckfinder/userfiles/files/11412509899.pdf In PDF document text
    • https://minhkygroup.com/luutru/files/jitixufovivaligis.pdfIn PDF document text
    • http://sghscsjamarai.org/guruhargobind/userfiles/file/3751622614.pdfIn PDF document text
    • http://ideal-site.ru/userfiles/file/26217401250.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/digidutalerip.pdfIn PDF document text
    • https://cdmsig2.com/ckfinder/userfiles/files/sojukubolojawiburele.pdfIn PDF document text
    • http://himalayakebab.com/shipinc/userfiles/files/32772215915.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b43545dc07---gexirotobutopis.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/suzizopero.pdfIn PDF document text
    • http://modulobase.com/userfiles/file/49245947600.pdfIn PDF document text
    • http://bindashnews.com/userfiles/file/48332762278.pdfIn PDF document text
    • http://mgtofubbq.com/uploads/files/xekigebajevup.pdfIn PDF document text
    • http://rcp-ranstadt.us/files/71301337742.pdfIn PDF document text
    • https://projekt-lesen.de/userfiles/file/29622982477.pdfIn PDF document text
    • https://giasidaily.com/uploads/userfiles/file/42677460828.pdfIn PDF document text
    • http://ucokampen.com/media/files/fowaputoxapamuke.pdfIn PDF document text
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/acf07085d8466e0bdefcfa4e6a915789/90414127009.pdfIn PDF document text
    • http://vibrator4you.cz/UserFiles/File/26579238652.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/nebuwoteduzakufa.pdfIn PDF document text
    • http://sinorarechem.com/upload/files/48623243763.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/1663c3aa1843d6351b6464158adcf3cc/sewusisuz.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/xexebozifopew.pdfIn PDF document text
    • http://battlegrouponline.com/app/webroot/js/ckfinder/userfiles/files/pemidukojipexuxes.pdfIn PDF document text
    • http://archidaldegan.eu/userfiles/files/34569801315.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137102cd8999---vezujenizimimerorizugela.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=block+story+hack+apk+downloadPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c047.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC047 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d859.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD859 23096 bytes
SHA-256: 462203e5e64f303ebd6f098355346f4c011ac1210ff39d4c29eaed9e0681bddd
font_02_sfnt_off000111d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111D8 1840 bytes
SHA-256: e11639021ae82bc81d66597892112dbefd7f2cb67f426bbebb6fc3c29591e729
font_03_sfnt_off00011a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A80 10732 bytes
SHA-256: 10d575b9be37ab2f68b140a8d96fc19c6da31720437247cdfba8237b0a200916
font_04_sfnt_off00013344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13344 16348 bytes
SHA-256: 8fcced7a8fcbf22d45689b44407ce1c1b45b78050135da208b7eeea4fc129b0d

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