Malicious PDF — malware analysis report

Static analysis result for SHA-256 437a73d3b9d556ff…

MALICIOUS

PDF

83.3 KB Created: 2021-07-07 06:56:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 86a4b5809764cbdef3c02fa489042712 SHA-1: c9bc6e75452a5c345539186406e83cc27869651c SHA-256: 437a73d3b9d556ff03e3dad1ec7a84a179706c99bbb8f103afc2cda0504e9e17
156 Risk Score

Malware Insights

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

This PDF file was detected as a phishing trojan by ClamAV and flagged by an ML classifier. It contains a link farm pointing to multiple domains, including one hosted on compromised WordPress upload storage. The primary purpose appears to be redirecting users to external sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/1mmemqij6m2es01r8vtqhhtca6/86030896528.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d1abf3cfd79---koxatowukizukirejagebunul.pdf
    • http://eurekaelearning.com/upload/news/file/gosajutumuzizivixo.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160baf30fbb601---31432147853.pdf
    • http://sonkertrail.org/clients/9/92/9260a3c387aed4615f72c72c3a1da295/File/wurijamatiritegisuder.pdf
    • https://armagedonspedycja.pl/files/file/88613005842.pdf
    • https://signika.pl/Upload/file/jawatabowapulewe.pdf
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/160b99bcf863da---gigekofu.pdf
    • http://natur-pet.cz/webpagebuilder/ckfinder/userfiles/files/87454890841.pdf
    • https://himalayanwanderer.com/himalayan/userfiles/files/rerumujazanudobujupute.pdf
    • http://28777886.com/Lpf/UPFILE/userfiles/files/fijakol.pdf
    • http://kxnjl.com/userfiles/files/40952841209.pdf
    • http://lateonsettay-sachs.org/userfiles/file/perawifed.pdf
    • https://sgpropertylawyers.com/wp-content/plugins/super-forms/uploads/php/files/8358feb274cd7a8139ce0eba777d952d/ketomakoroketizuv.pdf
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/nuruxukosuputelum.pdf
    • https://iescolumbus.org/wp-content/plugins/super-forms/uploads/php/files/fe43c52387546392f0cb96463f948224/12495710254.pdf
    • https://hitourkorea.com/FileData/ckfinder/files/20210530_C32B666907993324.pdf
    • https://gccpay.net/wp-content/plugins/super-forms/uploads/php/files/96db916453378218b9225769abf4e3b7/50462920866.pdf
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/f325680b48e225bb0db43d8da1877658/50546723600.pdf
    • https://martybermanassociates.com/wp-content/plugins/super-forms/uploads/php/files/d18d494740e4fceec13c470b7e031b6a/42324636781.pdf
    • http://hzbmsj.net/images/upload/File/kefibunikajorenu.pdf
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082640102d6b---zipozakok.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160aa03fdb4ea9---49445446455.pdf
    • http://ilturismoinitalia.it/userfiles/files/fogamejemad.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=bees+knees+searcy
    • 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_off0000e270.bin
7716dd7e956b0793560352f662d690f1c009e27a74511ce2f91538552997b3ef
pdf-font-stream PDF embedded font (sfnt) at offset 0xE270 10124 bytes
font_01_sfnt_off0000f93b.bin
76a62c5042a1ca0b30e05f02325a2e21c7f44e25def1943b221f50021c156734
pdf-font-stream PDF embedded font (sfnt) at offset 0xF93B 17784 bytes
font_02_sfnt_off000127ff.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x127FF 16792 bytes