Malicious PDF — malware analysis report

Static analysis result for SHA-256 34d542d9e6751bf7…

MALICIOUS

PDF

81.9 KB Created: 2021-08-20 22:05:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: de17f76d715f85414def5451cafd08c9 SHA-1: 36f5705cc5d8c181d13329b06017c87d7f00ab6c SHA-256: 34d542d9e6751bf7af566520172c3ee19c2990cfac5bf82dce5dda17c209dea2
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal a link farm structure, with many URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. No scripts were extracted, but the document's structure and embedded URLs strongly suggest it's designed to redirect users to harmful sites.

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 https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b3d3c58949---koxewenomufon.pdf In PDF document text
    • http://rapabzenec.cz/obrazky/files/gumuvamas.pdfIn PDF document text
    • https://arihantgranites.in/wp-content/plugins/super-forms/uploads/php/files/pns32tl6cms9jdba58tu9smkh6/26186435824.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c857d6088cb---62796320525.pdfIn PDF document text
    • http://er-trans.com/img/produkty/files/3918888501.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a6f7099c49---najulonebotelane.pdfIn PDF document text
    • http://szyuangang.com/UserFiles/file///39474845571.pdfIn PDF document text
    • https://www.dishdivvy.com/wp-content/plugins/super-forms/uploads/php/files/7eff178a0a2e4538ebb2c1027ea8dba9/67312029469.pdfIn PDF document text
    • https://paklya.su/design/img/upload/file/41948349346.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073e5aac094a---51801414980.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c2ae8f50285---56793360373.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfbc4a6f6c2---vowubetiri.pdfIn PDF document text
    • https://china-glass-mosaic.com/userfiles/files/20210815_211513.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/lowusalanegevonekabe.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/gavejoxiluf.pdfIn PDF document text
    • http://dailythang.com/userfiles/files/34106822806.pdfIn PDF document text
    • https://procogs.com/FCKeditor/file/71077387351.pdfIn PDF document text
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a620962bb7---logofewexi.pdfIn PDF document text
    • https://bluebeakbranding.com/wp-content/plugins/super-forms/uploads/php/files/6f630d90796785f0e566b373a01b884e/dupiw.pdfIn PDF document text
    • http://cycling-software.com/files/file/66328152539.pdfIn PDF document text
    • http://palami.by/images/file/timulume.pdfIn PDF document text
    • http://northmarking.com/userfiles/files/xumolimodufetimufaxu.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/32778985388.pdfIn PDF document text
    • https://studiogreenwich.ru/wp-content/plugins/super-forms/uploads/php/files/fcdc0ab88c439a7d2df732dd2860259d/78749233752.pdfIn PDF document text
    • http://top-conversion.ru/ckfinder/userfiles/files/bobexevodatupekiwepivaje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=othayadi+pathayila+mp3+download+kuttywebPDF link annotation
    • 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_off0000dbbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3D4 11120 bytes
SHA-256: 1419d7667ef23790d3a9be3a2db017bb06ce0089fdeaa8bfb3de3342e917cb0d
font_02_sfnt_off00010d77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D77 16860 bytes
SHA-256: 9786919633200c1babf074c607d1a885fcfed9b874c88922e1d78932fc5928ad

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