Malicious PDF — malware analysis report

Static analysis result for SHA-256 c129a44bbde25f1a…

MALICIOUS

PDF

97.1 KB Created: 2021-07-07 05:42:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ef7bebe009fb4450cd97a9db06420924 SHA-1: 8080caa120c73a4c134a5097f7f7e36d32f79471 SHA-256: c129a44bbde25f1a29c7cca02d25052aab6fd0f6e20e8ec3201300a5d3e1fa96
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

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 https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/899741a7579a7b6f511a1b59d5108599/19405707564.pdf
    • http://www.mediagrand.hu//data/editorfile/rigujirilekemopowutikaji.pdf
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a1e262ad8---gogupojizopadu.pdf
    • http://skncn.com/u/files/62737034711.pdf
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1607caff941a17---femoxaxapinadilot.pdf
    • https://acronimocostanzo.com/userfiles/file/torodonegorajogikila.pdf
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608111e650622---19291484621.pdf
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160713c61a2940---80764193282.pdf
    • https://thehideawayresortpattaya.com/userfiles/files/galebixotexipaxuwutewuri.pdf
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160c1d14052ab1---44782474343.pdf
    • http://jiendurancecoaching.com/ckfinder/userfiles/files/rokiwojazixapawapib.pdf
    • http://mp-hd.de/data/aktualnosci_imgs/file/57976620459.pdf
    • http://royalwedding.jp/images/blog//file/47824092661.pdf
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/16081eea6b0542---nefoxusoripadafovepog.pdf
    • http://tragiaocolamsapa.com/userfiles/image/file/79385963228.pdf
    • http://harryreichert.de/uploaded_pics/News/file/99158935681.pdf
    • http://szyldkj.com/luodan/images/userfiles/file/30122460624.pdf
    • http://donghobaoan.com/uploads/files/23597482715.pdf
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/niwomadalogowavadaxitav.pdf
    • https://adepotcustom.com/UploadFiles/file/20210618004735148.pdf
    • http://xiangzhuan.tw/upload/files/70595692960.pdf
    • https://tonwen.org/userfiles/file/66172832528.pdf
    • https://estigotours.com/wp-content/plugins/super-forms/uploads/php/files/52253a97f5d2e8e38f290e2246e5ecc5/95872383207.pdf
    • http://wfhs64coyotes.com/clients/b/bb/bbaa54d3a7800b2058c5658261a6771d/File/90159077052.pdf
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ac213a18e25---53799770879.pdf
    • http://artospace.com/pics/file/rixubap.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=ballad+of+you+and+i
    • 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_off00011b4d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11B4D 16792 bytes
font_01_sfnt_off0001335f.bin
4deb28d737771cdfeeb9440eb37cc584e0911d93eb52f62a7a5121cf8a2a2f8a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1335F 17496 bytes
font_02_sfnt_off00016099.bin
188c3900afbd72e4db2ffd6851999f2456a61f2baa738889433a30099e9a6c7a
pdf-font-stream PDF embedded font (sfnt) at offset 0x16099 10116 bytes