Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7cc178e1241795e…

MALICIOUS

PDF

83.7 KB Created: 2021-09-02 10:53:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 4f3c19c670ef981eb7135b8701ba8402 SHA-1: 61d14632f1b2a309af11594c7017201004cca5f7 SHA-256: a7cc178e1241795efa9046f59f193eeb1ab1fe1fcf433d85665e507cb31b1a4c
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lead users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bdd6a7ac7c5---wesazazorobapiso.pdf In PDF document text
    • http://jpind.pl/userfiles/file/mabuvuxalolo.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/5690695669.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/161069d0007ae8---68997161746.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/160d74080dc277---62300228619.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/e8d794840e8de4b5de9814fe97cfa569/32912020643.pdfIn PDF document text
    • http://bulk-supplies.com/userfiles/file/15945669461.pdfIn PDF document text
    • http://sushibelovo.ru/files/nuxifosevesabugubadil.pdfIn PDF document text
    • http://mikllc.mn/uploads/files/62577768474.pdfIn PDF document text
    • http://www.circoloaletrium.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c2d1276ef65---vijosolip.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/119sajsqu87pd2ekl2p8c3t5po/159744307.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160da5ab6ba85c---14439179305.pdfIn PDF document text
    • http://taiwan-tsai.com/upload/files/23916828398.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1608190a793177---23822833591.pdfIn PDF document text
    • https://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/edac5ad6ca8899e249df0dbfc7c0c3e8/52714825651.pdfIn PDF document text
    • https://jfefood.com/wp-content/plugins/super-forms/uploads/php/files/d783c507abde862f84c7c4b5aa4e3ea2/saxuwatoturafesixogekow.pdfIn PDF document text
    • https://sinhadventure.com/uploads/file/26888303372.pdfIn PDF document text
    • http://goang-hann.com/uploads/files/202108202221076865.pdfIn PDF document text
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/sogila.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160aa8b771e2f6---15972865407.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161266f11f03e2---98248955011.pdfIn PDF document text
    • http://ottotech.center/userfiles/file/jopavotavonutarojedofe.pdfIn PDF document text
    • http://harlit.com/upfiles/file/84313544604In PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=lng+bunkering+companiesPDF 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_off0000dcca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCCA 10860 bytes
SHA-256: aae5475107ec5d5001fe353c1ecd4e06c5fb41ea49f1e718322db15a5849f807
font_01_sfnt_off0000f5a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A8 18824 bytes
SHA-256: eeddfa28881d0f27cc3eafe085d2ca62d0b3a26b3daba4b46ceccccd69973f9c
font_02_sfnt_off000126d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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