Malicious PDF — malware analysis report

Static analysis result for SHA-256 039435b19c98d84c…

MALICIOUS

PDF

85.4 KB Created: 2021-07-07 09:17:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5d6f5641b036ecbcd4207c2c48035a60 SHA-1: a6c30b37ad84e7cc3f6b416ed7e53bed98f77b56 SHA-256: 039435b19c98d84c3f48a497a66c9967f50adf46e2a7e4f6b1acc7c1ec52d54c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a link farm pointing to numerous domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The file's structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://marathon-gexin.com/Uploadfiles/files/xakotebixurezejew.pdf
    • http://mai-colle.jp/userfiles/file/24958997366.pdf
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/40279279676.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1608d44e35fea7---28277495251.pdf
    • http://kowel.com/ckfinder/userfiles/files/1622951960.pdf
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/64350240f9ae2494db26cec70c9a1fe7/dovixujijiwulomevunujaf.pdf
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d5090e8bd6---6737378900.pdf
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/pvhrtel7pvl9mdtqkrilug86qr/33005575490.pdf
    • http://rrbrentacars.com/files/others/nodojadeb.pdf
    • http://gopherandsquirrelcontrol.com/admin/images/file/zolanatinasu.pdf
    • https://coonvalleycc.com/userfiles/file/zalenakepuluvezu.pdf
    • http://dientrotiendathc.com/media/ftp/file/39541634536.pdf
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c933835030---jixotemiz.pdf
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c118f388---bosexekituxaz.pdf
    • http://dongfangguohua.com/ckfinder/userfiles/files/nusezowojatepaxa.pdf
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/36f9df24214605a8d7e1020c92a82509/viwod.pdf
    • http://asiadomainstore.com/userfiles/file/49697522730.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609858eabca5f---25274456013.pdf
    • https://roc.mn/uploads/files/merabezagorupodezin.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/c9e5a5a93599dfe7722e3c6cf648ba6a/xefusajovo.pdf
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/rja1149a1fq5trjqjc91am1r53/kusasutanidetenoju.pdf
    • http://immobilieninvestors.eu/userfiles/file/fapotapefuponuvakisavuxit.pdf
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072717515723---jixerakevonubagu.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=rodent+scratching+in+wall
    • 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_off0000ed86.bin
f668a9d1e82f5fc07f34c0fec207eba1fb76ac2521d8f742029345de9fb0de64
pdf-font-stream PDF embedded font (sfnt) at offset 0xED86 16396 bytes
font_01_sfnt_off000117bd.bin
1cbbb0874f7ec424f41ac19af7e3a5378a57a7413f87845d8b8746110fc024c5
pdf-font-stream PDF embedded font (sfnt) at offset 0x117BD 10780 bytes
font_02_sfnt_off0001305f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1305F 16792 bytes