Malicious PDF — malware analysis report

Static analysis result for SHA-256 443a031050e8cd16…

MALICIOUS

PDF

81.7 KB Created: 2021-09-01 07:46:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 95fbcdc2446bf453dfeb73a3e2d51e59 SHA-1: fd60fae212a6d826d6d08d27497101d28a32e330 SHA-256: 443a031050e8cd16081e21f65ba354ffd7356e42c00b27ab64e348474e5e2a12
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and appears to be non-readable content generated by wkhtmltopdf.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://mistralizmiryonetim.com/uploads/file/20828486869.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/gglqch1rmegsr1rpp10tpk2kf3/ponegitololuj.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/2bu87uctputa0a05n2s2mp4rq6/52755159305.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/d268290140c093efb27a60f36f4650db/66855616171.pdf
    • http://contua.org/userfiles/file/wawimitapuxolimixulel.pdf
    • http://daiichihr.com/uploads/news_file/sejoxefamefo.pdf
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160908f847746c---98084271122.pdf
    • http://zkojicin.cz/userfiles/file/jijujugalije.pdf
    • https://pinotcar.com/wp-content/plugins/super-forms/uploads/php/files/9c47890f931c979f9de165fc14a82cc1/74307730940.pdf
    • http://kssi.ir/public/userfiles/file/99613695427.pdf
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/b204889923108a236198c2a4a1a3de40/verakamofakorepuwelaposu.pdf
    • http://dirabrealtors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094db308f8dd---9402754625.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f3d506cd30---69452316153.pdf
    • http://hkxhjfc.ltd/uploads/files/20210706234432.pdf
    • http://workcoop.org/fckeditor/userimages/file/20210626135715.pdf
    • http://stark-tools.ru/images/uploaded/32851765795.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160f630351b076---xeremaropew.pdf
    • http://dom-nenilovo.ru/wp-content/plugins/super-forms/uploads/php/files/44252365286059142b9e77a2fdd5b762/mozutipewigifofomerewez.pdf
    • http://cityclick.it/userfiles/files/wavuxovis.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/8690cff1c9b4bcffe71261272dcc3bda/26962956346.pdf
    • http://angelescare.com/userfiles/file/mobewak.pdf
    • http://ceramicaartisticamarsalese.it/userfiles/files/gopefowurife.pdf
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/12413b2e31f8acfe501b888a940a72d0/79320554405.pdf
    • http://crystalsteakandstogie.com/clients/1/1d/1dbb6d5698303b6304ae84622e226a19/File/vatuzativotenafos.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b64625c0d5d---begipajowusimaxipak.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=urdu+meaning+of+curious
    • 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_off0000d9c3.bin
db359cb8320cc10bc85ea531bdb2c39e2c15c4c2fd242f8388280cb94f0a530b
pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C3 10784 bytes
font_01_sfnt_off0000f24d.bin
59dfddb49e6853742b19af50620f0c18aa3b90ea5f8e83e9892c6684c867a33f
pdf-font-stream PDF embedded font (sfnt) at offset 0xF24D 17920 bytes
font_02_sfnt_off000120a3.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x120A3 16792 bytes