Malicious PDF — malware analysis report

Static analysis result for SHA-256 f850613213698cf3…

MALICIOUS

PDF

80.4 KB Created: 2021-06-29 00:37:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ae15c1933d1e3d829c82b709770f06eb SHA-1: ae6194a918ad8cb8a7100ca897a65349ace81db2 SHA-256: f850613213698cf3ef82b93d249271d0d61da25f5fb239b7e75633245f7cf174
156 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics as containing a link farm pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The document's structure and embedded URLs suggest it is designed to lure users to malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/qactnbqgc3d9fvekdp19tgqm2k/megetuxojurofevug.pdf
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/8bda284728ca8d4eb141b937d4aaa797/lewewunixuforevojesinubal.pdf
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607efeac7fb3b---sakawibokigatubo.pdf
    • https://braviengenharia.com.br/wp-content/plugins/super-forms/uploads/php/files/4tuonui7stqepnmpf6gaark9kp/fasupolapelosi.pdf
    • https://www.cedicar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b088224853a---50810586243.pdf
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/47edeb82cf8d6b08f927188e0102be5e/85393657427.pdf
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608371418dd1a---53742472382.pdf
    • http://gagutp.com/sa_upload/userfiles/file/20210527041029.pdf
    • http://kiuanai.com/userfiles/file/91344055336.pdf
    • https://thejasmineway.net/wp-content/plugins/super-forms/uploads/php/files/3taigqp2o71kficsc3ps9do369/minebesumologajesegozo.pdf
    • http://aardbeienfeesten.nl/uploadimages/files/32096459189.pdf
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ffc7f5df21---liwaboxi.pdf
    • https://globalclassic.org/wp-content/plugins/super-forms/uploads/php/files/06rkfcb0bf8cd6qe919td9o7as/rotumuxolewokekukawiju.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/c438a1ef5eeca3f2ff2835abe55c50a2/73113876158.pdf
    • https://afd.me.uk/wp-content/plugins/super-forms/uploads/php/files/uf1jkchbi7irlm9vt28eol64bi/wuwegav.pdf
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/7cd805cc9216db7180dc2339be5ffa86/bajepavunibob.pdf
    • http://blessingsngo.in/userfiles/files/zedomol.pdf
    • http://arci-mp.fr/admin/File/kafababujesowig.pdf
    • http://www.adarshvidhyasankul.org/userfilesfile/56734360017.pdf
    • https://bmat.mn/uploads/ckfinder/files/nilejomo.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ae0aac800ef---54047693212.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=2+daughter+cells
    • 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_off0000d941.bin
44d7c49915612b9e8bca70deb833022b5c265f253ff0c66f506a40b822224bf9
pdf-font-stream PDF embedded font (sfnt) at offset 0xD941 16484 bytes
font_01_sfnt_off000103be.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x103BE 16792 bytes
font_02_sfnt_off00011bd5.bin
790024644e620568df8636f4c343b90de26e274cb5a3f6a7247e7bba609515a8
pdf-font-stream PDF embedded font (sfnt) at offset 0x11BD5 10456 bytes