Malicious PDF — malware analysis report

Static analysis result for SHA-256 03301384c79d6093…

MALICIOUS

PDF

86.7 KB Created: 2021-09-05 07:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: c4153cc049169f6ceb8eb1533ffb2da2 SHA-1: dd481810a03da392a1dc77fb24843e7429500377 SHA-256: 03301384c79d609356278ffe3277668a14df111abfca831259490d63f6d07082
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a link farm pointing to compromised websites, suggesting it's part of a phishing or scam campaign. The 'SE_CALLBACK_LURE' heuristic indicates the document likely prompts the user to call a phone number, consistent with tech support scams or callback phishing. While no scripts were directly extracted, the presence of multiple external links and the ML classifier's high confidence score suggest malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://challendor.com/fckeditor/upload/file/15421148584.pdf
    • http://d2dgroup.net/upload/files/44840252412.pdf
    • https://bahamianbrewery.com/ckfinder/userfiles/files/31287494265.pdf
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/6d018b517a5e97b7fe3c870fce05d9b2/37250510176.pdf
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/fvgd60ehlrkvp1es4unpupq7st/49804635910.pdf
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/99f30d1fa820c3864f9126e26bd389e3/sewibajuzewonarev.pdf
    • http://haithuanphat.com/uploads/files/21111999012.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/ec86e9d8c2f1770a335771573cca3dc9/7399068343.pdf
    • http://inspiredindianfoundation.org/uploads/92618259847.pdf
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0491ea7df1---lokite.pdf
    • http://broadgatecapital.com/userfiles/file/dofadagedijukesidogexo.pdf
    • http://kossuthdigisuli.hu/userfiles/file/sibusegimer.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ee8a745b1b5---xizaruvabire.pdf
    • https://afayl.com/userfiles/file/10012062821.pdf
    • https://psychologgia.pl/Upload/file/jitejepatibexul.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/bc6bb57ab2ecbef825f803815422c550/98432936084.pdf
    • https://mlbcsimleague.com/ckfinder/userfiles/files/92733433968.pdf
    • http://irmascaritasdejesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16080b3e0bafcd---nifivawurulosewasog.pdf
    • http://uni-farm.pl/ckfinder/userfiles/files/99056860093.pdf
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/pgv8i687j8s13617c7ee7e6p33/zufofetip.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/3d326e142849e064bb298a85423c316f/mizagemo.pdf
    • http://daydala.com/userfiles/file/viruzipi.pdf
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0ea3a62c60---garewagelakirix.pdf
    • http://aaaexpressac.com/userfiles/file/96818207447.pdf
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/27723903045.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=point+sources+of+water+pollution+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_off0000ed3f.bin
f9e5d2daa49ec66f07429d9eaf9dbdd756c77f53ad20d4282a528b7fc4b3cd82
pdf-font-stream PDF embedded font (sfnt) at offset 0xED3F 10800 bytes
font_01_sfnt_off0001065a.bin
1f702397a2c70d63ef2014d966f87fdaca043efaae9a69b1f6bf4b11286c6a14
pdf-font-stream PDF embedded font (sfnt) at offset 0x1065A 17848 bytes
font_02_sfnt_off000134b8.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x134B8 16792 bytes