Malicious PDF — malware analysis report

Static analysis result for SHA-256 69660cc7cb718477…

MALICIOUS

PDF

94.7 KB Created: 2021-08-08 01:52:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 589931db93f2a4e06fed1bacf56a4e82 SHA-1: ca3445269977278c0b4bec7bc5bcb0fa1598f049 SHA-256: 69660cc7cb718477324b96fbc4370fe7bb6d36b2578f45730b51d109ee36296f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links pointing to compromised WordPress upload directories and other potentially malicious domains. The PDF structure and embedded links suggest a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://felix-schulze.biz/wp-content/plugins/super-forms/uploads/php/files/vq9uttsb600g3f187qs880lce4/94035156830.pdf
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b95988e93c5---17845616553.pdf
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d61fde62dad---68110076817.pdf
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ec9ecc8dae9---76178139633.pdf
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829f465a875---94507663355.pdf
    • http://bayernglobal.de/userVZ//file/46233468753.pdf
    • https://lawyerupsmart.com/tempimg/file/99447925386.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607defd646185---48615471217.pdf
    • http://chamdure.com/DATA/files/zudunenaxikopabexemem.pdf
    • http://www.corazondelsol.es/ckfinder/userfiles/files/giwibufesisobagikisunem.pdf
    • http://sportschoolindex.nl/images/uploads/satolulaxapejavumewi.pdf
    • http://fixafilm.se/userfiles/file/52281524214.pdf
    • https://salvatoredivilio.it/userfiles/file/rewixerujazu.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160956ad4a08b9---dinilokubudavirav.pdf
    • http://mpti.ru/userfiles/file/2502820099.pdf
    • http://www.mkkdigital.pt/wp-content/plugins/formcraft/file-upload/server/content/files/160892398735ee---jorakizevebakudoxuj.pdf
    • http://www.retorika-zidar.si/ckfinder/ckeditor_uploaded_files/files/walilosapefadut.pdf
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c485b223079---30878865810.pdf
    • https://daks-96.com/f/uploads/files/nusukapi.pdf
    • https://sandalyecenneti.com/wp-content/plugins/super-forms/uploads/php/files/o6hnd01jpibnj94gu02pq5588f/35736982253.pdf
    • https://www.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160720a667834d---25641836099.pdf
    • http://niezapominajkowo.eu/userfiles/file/1446501979.pdf
    • http://bukhatirhomes.com/userfiles/file/ropipixisefafepuramofutal.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=annual+report+sample+of+a+company+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_off00010fd3.bin
517f9250f42dc9356e3f27cdbb386d9758018f4ee4731651e9f5bc6b588bbf8e
pdf-font-stream PDF embedded font (sfnt) at offset 0x10FD3 10884 bytes
font_01_sfnt_off0001291b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291B 16792 bytes
font_02_sfnt_off0001412d.bin
884ee029d31be27c379ee80fcf260b5687891a0e563f08255f69a939f634b14b
pdf-font-stream PDF embedded font (sfnt) at offset 0x1412D 16700 bytes