Malicious PDF — malware analysis report

Static analysis result for SHA-256 c594530b0dee5897…

MALICIOUS

PDF

91.4 KB Created: 2021-09-02 21:12:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f918a56dc315925a5a5560f94d2b393 SHA-1: 9f36950e8ec2b4676f428615c39db3852fe28205 SHA-256: c594530b0dee589754c212f27a4448e9c2fff3acf0137722534ea18e3501431e
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 WordPress sites acting as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm on disposable hosting and the use of UTM parameters suggest an attempt to obscure the final destination and potentially leverage SEO tactics.

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://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612edb7fd4b4f---99954301880.pdf
    • http://ancient-theater.gr/media/file/73517133915.pdf
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ce455da7f7479fb7454cc5f0d4f38acd/30277243213.pdf
    • https://webrobogo.hu/kepek/75151720804.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608d309f32028---jikubevegeviniluvigofixa.pdf
    • https://monuments-msk.ru/wp-content/plugins/super-forms/uploads/php/files/cd0faadc36298b0c824afe82b2149a13/gomibunesujawijizagadode.pdf
    • http://auto4-spb.ru/public/images/ckfinder/files/46501063669.pdf
    • http://blueyee.com/upload/file/292344366382.pdf
    • http://dalboncostruzioni.it/userfiles/files/80076893370.pdf
    • http://thesciencenetwork.org/uploads/files/kuregasiputakinoru.pdf
    • https://divinenine.net/userfiles/file/tumito.pdf
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/703cba0f010d45a3ac9d0d6537fd9e58/3948911738.pdf
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e96a9a772d0---bewujamu.pdf
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce878658e---vaximuxuwapufedu.pdf
    • https://rockdental.co.uk/wp-content/plugins/super-forms/uploads/php/files/de0997d30db6ec20a201b6acbbb260d3/28615595317.pdf
    • http://pensjonatagat.pl/userfiles/file/wujavudepefodofixi.pdf
    • https://fullhousetourism.com/UploadFiles/file/20210727225301189.pdf
    • https://tylbm.com/Upload/ckeditor/files/53864206730.pdf
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094ad9434fad---15181241449.pdf
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afa8fede554---4700153627.pdf
    • https://asiquim.com/ckfinder/userfiles/files/tipolurigijudapiranu.pdf
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f233564006---tefowenezugaga.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=pancasila+sebagai+paradigma+pembangunan+nasional+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_off00010395.bin
f5767213934105879eadbab04698f5756aa2bb50dd220adef01262259c116061
pdf-font-stream PDF embedded font (sfnt) at offset 0x10395 16516 bytes
font_01_sfnt_off00012e32.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E32 16792 bytes
font_02_sfnt_off00014649.bin
f41592729caafd4d99cb663158b719b32802f41f83b8d8d6a07d88fda413a03e
pdf-font-stream PDF embedded font (sfnt) at offset 0x14649 11104 bytes