Malicious PDF — malware analysis report

Static analysis result for SHA-256 12a19c35a3aaa67e…

MALICIOUS

PDF

85.5 KB Created: 2021-06-30 10:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: 4dc0697945f55555f1fa2c2fce1a4545 SHA-1: 0635c7146e3c3911e792018a1a54b08a4d0fd3d5 SHA-256: 12a19c35a3aaa67e997475ea512e99c464e5a46327bd4228d58217e17f029a75
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. Heuristics identified it as a link farm pointing to compromised CMS uploads and disposable hosting, suggesting it's designed to redirect users to malicious sites. The document body was unreadable, but the presence of numerous URLs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic strongly suggest a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://hurtmar.pl/Upload/file/mumuz.pdf In PDF document text
    • http://banglatalkies.com/dynamic-images/cms/file/zavosutajudival.pdfIn PDF document text
    • https://deltaguvenlik.net/userfiles/file/mitij.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/7mqt22v6ff9ecnqtrb39oqmj55/witupuwezefuwabede.pdfIn PDF document text
    • https://saatyapi.com/upload/ckfinder/files/jifufi.pdfIn PDF document text
    • https://www.lenoir-elec.com/wp-content/plugins/super-forms/uploads/php/files/bosdphnnkig01pv6jhnabhpl86/begudemuzulo.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/72603876754.pdfIn PDF document text
    • http://trendybiz.in/usersfiles/file/xazoxudude.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/35828674239.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c546b03d8a---15025414694.pdfIn PDF document text
    • https://www.kadinlarsitesi.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609b22c1bc8fe---30123119597.pdfIn PDF document text
    • https://davebakeragency.com/wp-content/plugins/super-forms/uploads/php/files/25e0e3ca2830f2f3c18604ac51f1b48e/4035311085.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/43900173531.pdfIn PDF document text
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/50fb50077f3b39f1c7fc6c072c6c68fa/tazisiwujakeda.pdfIn PDF document text
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/0dkdcoo4m9ef7adkf2f2p4dr32/rokiravezewikemi.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/bab49b61a1c201b945d1765b46331e7a/sutosewav.pdfIn PDF document text
    • https://festival.bg/fckeditorfiles/file/tokujesifesabewabikis.pdfIn PDF document text
    • https://www.generalutilities.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f303d50c3---34122254418.pdfIn PDF document text
    • https://sckstone.com/wp-content/plugins/super-forms/uploads/php/files/e1b6518d120fc34ec3ab77adb88eabc6/81505254814.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16093b62a225b2---56791873488.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/23888153527.pdfIn PDF document text
    • https://dewalt-naradi.cz/media/upload/editor/file/nafir.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/11u9camo6gkfkvq1ke4ea3ig0h/9418044043.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/wesovaxubekurokenikisemor.pdfIn PDF document text
    • https://thietbixaydungcantho.com/canthomobile2/public/images/sanpham/files/55833851389.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=having+a+clear+mindPDF link annotation
    • https://sharpspringwww.kinsta.cloud/wp-content/plugins/super-forms/uploads/php/files/d977ac4e23573b68047b423eae75bc08/23208086663.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE03 16744 bytes
SHA-256: e945a6a6016d2026e7bb245fe1affaab2e1729448a66aba947c90ed3105300ac
font_01_sfnt_off000119a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119A9 10384 bytes
SHA-256: 56fc9465db2ec6d1a4435e886ea9aaa656a3da0fef697ae2f9f00178c3b2ecfe
font_02_sfnt_off000130d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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