Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef50ad2d4de76cae…

MALICIOUS

PDF

89.7 KB Created: 2021-08-19 18:59:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f6dce26eea331f93fb27a53513ee8c88 SHA-1: 9c6a6c0edc1ed4a22f0d7ae78877f9d14ae3f288 SHA-256: ef50ad2d4de76caeb2637a8d573e3e3d21327f81aa52284a582574f1bb2975ac
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress installations or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect to phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9875

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 http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080f0f287d13---94398446496.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160faf2e745c1d---96333696664.pdf
    • https://edinburghpools.com/contents//files/gived.pdf
    • https://52fantasies.com/home/holly/public_html/ckfinder/userfiles/files/81128664261.pdf
    • http://gtlmarinefuel.com/userfiles/file/75638706429.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/ec79dffgk5j8n400sbrtls2am7/redenazivemoxefebigibot.pdf
    • https://accuratesearch.com/userfiles/file/65313236694.pdf
    • https://aznamaste.com/ckfinder/userfiles/files/fosumiseke.pdf
    • http://virus-safe-zone.com/ckupload/files/lirelodawarel.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/2454f3da08fa874f0cc317cb0ad35794/97682469532.pdf
    • http://budohurtsa.pl/userfiles/file/begabimafamor.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16090af1b64810---peterojekimifurarebom.pdf
    • https://forumhotel.by/wp-content/plugins/super-forms/uploads/php/files/g762ak809qbb6mf617i0csj1q6/ribedubujisezetejajedeful.pdf
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16079d36854117---rexigovofunetokavolis.pdf
    • http://mytmbc.org/fckimage/file/lugigaxenalir.pdf
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/4053a798c7bd8df8cabfc070f895fba4/zixelabitirijuwufif.pdf
    • http://yokohama-model.com/userfiles/files/renarirunazat.pdf
    • http://phillipwhiting.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70493e4d08---86539939464.pdf
    • http://portalpr-b2b.es/img/user///file/_0003177001625155107.pdf
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/zavewemoxifogabazi.pdf
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/e1de798f813b4f3aef84cbe07b57c032/vakagimujebujadetuwugika.pdf
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/f86c399b3a35ba06d8b5c507ff5f8c70/34718893689.pdf
    • https://egf.tw/test2/images/file/xewuxefedoraxaxenebixixi.pdf
    • http://chapmanhighschoolclassof1968.com/clients/c/cb/cb1fed5110c07f199f416a264ee6943c/File/30904508263.pdf
    • https://footballsod.com/images/ck-uploads/files/73277769829.pdf
    • http://capmar.eu/userfiles/file/86827230907.pdf
    • https://envida-nieuws.nl/bsb_website/upload_fck/file/moruvugubetulewu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=a+history+of+modern+psychology+textbook+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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9e4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E4 16792 bytes
font_01_sfnt_off000111fb.bin
47d68b1cd6b0bc95c59b4af896dcefeb87f56c56ce46ead77e4d7093e2697968
pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 11336 bytes
font_02_sfnt_off00012c1a.bin
2833353606899eccc1855050d4e83bcbc95535f0b2fdedda8e80754f3faa91f2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C1A 16732 bytes