Malicious PDF — malware analysis report

Static analysis result for SHA-256 33614e7dfe9236c8…

MALICIOUS

PDF

88.3 KB Created: 2021-08-11 19:52:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35cd49cee9a5bdeeee55ea4315547017 SHA-1: 7578bf6262cd15c6c3736708793b909898293d4f SHA-256: 33614e7dfe9236c852b58568ea75ee176b864ba19cdebbf4a07b846d74f966e4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to compromised WordPress upload directories, suggesting an attempt to redirect users to malicious content. The presence of embedded URLs and the nature of the heuristics indicate a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.tangelo.no/wp-content/plugins/formcraft/file-upload/server/content/files/16071f5c32fbf2---maseradabefe.pdf
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/zarebaxamafiwijogukaruju.pdf
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2a0b481d45---85953121915.pdf
    • http://esoftland.com/userfiles/file/29926041238.pdf
    • http://www.asejnrtigers.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b15883e8e41---44288650072.pdf
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad1766beb---fimidot.pdf
    • https://francoisdaulte.com/ckfinder/userfiles/files/5324338644.pdf
    • http://skylineidaho69.com/clients/c/c7/c7306e0a9cc1d421caefa9c307ca601f/File/61215866133.pdf
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/vpmh28fn98f2rtbcmib427hrcl/15650617408.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/rj4smrd2o6g76djse8417at8j4/88942923569.pdf
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/nesurasupu.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd57f9170a---kozijuwore.pdf
    • http://stolizstekla.ru/userfiles/file/gokalawuvibuzimukute.pdf
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4b2546b8b---20107484531.pdf
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/n4iuocqq520r86u3rmhv80aqm4/bibazanitorug.pdf
    • http://imhkayseri.com/resimler/files/depuwixixixutinavadin.pdf
    • http://fly.no1-yes.com/userfiles/file/mexubufawuvipekupowati.pdf
    • http://cancunday.com/travela/img/files/79159966407.pdf
    • https://sport-jicin.cz/dokumenty/55022684893.pdf
    • http://slesnick.net/userfiles/files/vikivi.pdf
    • http://alituncer.com/userfiles/file/xafeli.pdf
    • http://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086ab71ca836---radasemovin.pdf
    • http://sieckultury.pl/wp-content/plugins/super-forms/uploads/php/files/9d76a2c37fc03471ddc17e9e6898c5e4/peramusuvajotutagu.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f0ed3216bf8---devegojigulodadiz.pdf
    • http://bmcnx.com/userfiles/file/mukuk.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=2017+mercedes+gle+safety+rating
    • 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_off0000f531.bin
ecb156147ab7b9a0ce3e81695f850aa1c9bac743eb88c198cac5e3af1918d444
pdf-font-stream PDF embedded font (sfnt) at offset 0xF531 11060 bytes
font_01_sfnt_off00010edb.bin
2e110746d52d0ec43afa221a6ec4fbebe04aa402f5d13535496ec70fec1e8083
pdf-font-stream PDF embedded font (sfnt) at offset 0x10EDB 17096 bytes
font_02_sfnt_off00013b5d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13B5D 16792 bytes