Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac4e59d99b61b81a…

MALICIOUS

PDF

79.2 KB Created: 2021-07-05 13:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 62e9a24eb99bc8a606a16c03c834d333 SHA-1: 681f66c458bcf98a78fef792e04b7baabe573354 SHA-256: ac4e59d99b61b81a274f9883ab2f1780f108dea717efc9add691e5868bb05fa5
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier with high confidence. Heuristics indicate the document functions as a link farm, directing users to multiple distinct hosts, many of which appear to be compromised WordPress sites or disposable hosting. The embedded URLs suggest an attempt to direct users to external, potentially malicious, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pumarecovery.com/userfiles/files/25731528801.pdf
    • https://www.eziblank.com/wp-content/plugins/super-forms/uploads/php/files/gs0cr992jcsis0t5e6d895qkg7/14385076201.pdf
    • http://kingalbertltd.com/uploadedfiles/file/30824350978.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090473f62bcc---dizovafuvatuzurajisonoz.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3aae21c135---mepujozotiduvinivemufota.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16083136ca6a6e---69180599295.pdf
    • https://fid-data.fr/app/webroot/uploaderfiles/48847746245.pdf
    • https://tocken.se/anvandarbilder/258/files/rejutonife.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607fcf7a21002---74725849328.pdf
    • http://thsport.dk/ckfinder/userfiles/files/dixuwopidixigiwirupepaso.pdf
    • https://lion-trading.co.uk/wp-content/plugins/super-forms/uploads/php/files/02t72et05n6urqe5lvhnb93df7/xopil.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/qp214uv4tj6b21ds6angokc8a6/64436405180.pdf
    • https://www.jahnigterbraak.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608e9f322811d---52901798862.pdf
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/538b83ff3a0bb66f85751b8139668622/75955952038.pdf
    • https://moto-trend.cz/public/files/fck/file/75219280113.pdf
    • https://mimpi1pusat.com/contents//files/xokujugerexitov.pdf
    • http://www.esthemed.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608cfc42a5e78---30943121774.pdf
    • http://yfatc.com/userfiles/file/41875044008.pdf
    • http://dyglas.com/userData/board/file/gabesaraturogegusurilebod.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083463c74983---30700200627.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=magh+month+in+english
    • 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_off0000d3e6.bin
027ffe53e3b3ec2bb050c37c9442f99727fe143e3dfeddae8e5753ab2f6c56ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E6 10448 bytes
font_01_sfnt_off0000eb62.bin
9f6c923933879b14f7232b08b0f07ddca359b1639b0bd3be04cd936ed8016286
pdf-font-stream PDF embedded font (sfnt) at offset 0xEB62 17084 bytes
font_02_sfnt_off000117c2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x117C2 16792 bytes