Malicious PDF — malware analysis report

Static analysis result for SHA-256 ac73c873ded210ab…

MALICIOUS

PDF

75.0 KB Created: 2021-09-06 18:53:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 101f65f95d252a6392a75a19ed32453a SHA-1: 2930c29d9f0de0d063028682689213d31b8884f3 SHA-256: ac73c873ded210ab1abc05da9911be908b44410bff256d60d46129d3fc5455c1
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a link farm pointing to multiple domains, some of which appear to be compromised or disposable hosting. The primary purpose seems to be redirecting users to potentially malicious content, consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://ecofincas.net/ckfinder/userfiles/files/bozinexobode.pdf
    • https://kodcomputers.ro/2664/uploads/nixujotefajetimoxabas.pdf
    • http://mcenterdk.ru/fck_editor_files/files/gokavakowekenuwozejux.pdf
    • http://osrclass1967.com/clients/8/84/84e84eb3bb32f45446e669e24fea3ebc/File/33720788420.pdf
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607602c7dbf27---zinexijufivi.pdf
    • https://thealloywheelcentre.co.uk/wp-content/plugins/super-forms/uploads/php/files/81242a1cd3e5538087a30279c1af788f/76208504331.pdf
    • https://securitydm.com/slicice/file/14637503302.pdf
    • http://traiteur-ribot.fr/userfiles/file/48356600270.pdf
    • https://guanlai.tw/uploads//files/202108130634127918.pdf
    • http://canadanur.com/resimler/files/11634607916.pdf
    • https://alienaquatics.com/home/gb/public_html/ckfinder/userfiles/files/69453630202.pdf
    • https://ises.ca/phpsites/vertical_living/uploads/file/43589354717.pdf
    • https://solarconsulting.org/wp-content/plugins/super-forms/uploads/php/files/7596486fa1abf3e5aa25774fe26be2c2/35809598071.pdf
    • http://synergyproperty.com/images/files/55860587245.pdf
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/ebb0ae470944a790b249e4dd3e4ba03f/guvoxikafejijasixenepa.pdf
    • https://toscanafantastica.com/userfiles/file/xofagigulubusamamowe.pdf
    • http://birnagarcollege.in/userfiles/file/253045948.pdf
    • http://gemwishrs.com/ckfinder/stones/files/68217203471.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=chernozem+soil+pdf
    • 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_off0000c58a.bin
1272740dd4461ea80fc25c150b911926b04518a64d7c730f3d6a6f8104803e2d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC58A 10596 bytes
font_01_sfnt_off0000dd87.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD87 16792 bytes
font_02_sfnt_off0000f599.bin
28ade0cdb5663edb3afd86e90b9fc7260c8cdcff6609bc762ed7ab252e53aff7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF599 16232 bytes

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