Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbc267a7985ed4d6…

MALICIOUS

PDF

70.8 KB Created: 2021-06-30 07:46:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 262673decc2cbd2898157da49fc8cab4 SHA-1: b33fcaf34603a87bec2a31ae000424024d12b27b SHA-256: dbc267a7985ed4d687eff651bf0c6488421add3916f264ede37fa769f7e8ee71
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, but the URL structure and heuristic firings are sufficient to assess the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aiswaryamatrimonials.com/fck_uploads/file/87403630899.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/0b07b21f8d1a575c8c9b43881429361c/bixinilopubawi.pdf
    • http://www.heksan.com.pl/file/kenamudalebilovowepinabo.pdf
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ec0cba2d9---4370958702.pdf
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16088fd8051e78---194196745.pdf
    • https://vuaship.com/wp-content/plugins/super-forms/uploads/php/files/jv13gj8c0io4tc0orhlglhucon/vonibexilotunusiboxivok.pdf
    • http://4reality.cz/userfiles/files/vobozirefudalajogitin.pdf
    • http://luxcottage.ru/stroykamen/userfiles/files/sabarewivurelujifine.pdf
    • http://redwoodpwr.com/wp-content/plugins/super-forms/uploads/php/files/d37c3dhj50b2kch2ii2dd0cdk1/janutunepuzexosebifilas.pdf
    • https://larioenergy.net/uploads/file/ginifafulopurud.pdf
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a38f0056b83---kopobosojilusenasogofuf.pdf
    • https://mytutr.com/wp-content/plugins/super-forms/uploads/php/files/1869d1eab9346129d4a771c299923580/vaferuwed.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/3c818dc9ddb5a9d11a132c787a149f26/61929584225.pdf
    • http://businessvaluationapp.com//fck_files/file/powekazezuje.pdf
    • https://hpsoft.shop/upload/files/99694514341.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608dac895e14d---48801073409.pdf
    • https://salvatoredivilio.it/userfiles/file/mufanuri.pdf
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1609c519308d16---jijabedipavike.pdf
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b84225807af---kilewumagixufojebu.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fc3656324b---58628609932.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=wordly+wise+book+8+answers+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_off0000b313.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB313 16792 bytes
font_01_sfnt_off0000cb2a.bin
53a817d9c7e41b2a93c60697ec674c98e7f8fe6260587166f0d26898d1ec12fc
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB2A 11024 bytes
font_02_sfnt_off0000e4bd.bin
15240ba2677074b587086dc6c1ff179b5ecd315f6ba043d918279ba996c59028
pdf-font-stream PDF embedded font (sfnt) at offset 0xE4BD 15604 bytes