Malicious PDF — malware analysis report

Static analysis result for SHA-256 50458af6cd27da84…

MALICIOUS

PDF

85.5 KB Created: 2021-07-07 11:52:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2f49cfed813ad05cb4ae24557ea898f8 SHA-1: f20a4f9133e354dc958fa6cc1fca3d7b9a5caaf2 SHA-256: 50458af6cd27da84fc998955c1587194dbf32005357003576b3d369bec807589
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised WordPress sites, suggesting an attempt to redirect users to malicious content or phishing pages. The presence of numerous distinct hosts and UTM parameters in the URLs indicates a broad distribution effort.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/d2f9cbbea703c7f5ea15803548cb356a/45002327617.pdf
    • https://landlorddebtadvisory.com/wp-content/plugins/super-forms/uploads/php/files/6b81dvrv5righmpc5ur0a5ir87/niwowisulusewizesej.pdf
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/ph37mdfm34f6pgs6nrnq7oqs4b/xuwijawudeleberiwosesoda.pdf
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/3d1e0b3adf8044f826bec805132c5c39/feseridameno.pdf
    • https://thefertilizergranulators.com/d/files/39370499872.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/ff754aeb700283e7a878a63a18f59e31/13535914467.pdf
    • https://gfow.om/wp-content/plugins/super-forms/uploads/php/files/dpebm8n5942ji87mjvhecu5cqs/68559743911.pdf
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/76d5ecb75ca216f0109747e90a1a9acc/33084712439.pdf
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160742ff487e2c---kurukifo.pdf
    • https://www.hausbootgeiseltalsee.de/wp-content/plugins/super-forms/uploads/php/files/r6b2mq4ovr85sgi0ub6298go3k/2372030246.pdf
    • http://pathtojanna.com/userfiles/files/15848114949.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/8b5070cee952ebb9a6870e2bf408af37/kadozopalovotukeg.pdf
    • http://abnicum.com/files/file/mowimuwijasebesowewi.pdf
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160ba37f4e32ac---50392098654.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/jaxumolelubovanetodowof.pdf
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/nsci54p0934o4v8ulnmvp5e4ps/wodemilepijuzevom.pdf
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/9ea454cf940ee90c68ec6f95320a0489/kedukibuwuxun.pdf
    • http://lignumweb.com/site/webroot/uploads/files/pumolewamefamig.pdf
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16072cb643f205---53389399626.pdf
    • http://jpbullies.com/clients/2/2c/2c827f09d77a589c2c5c7da8c033a3f4/File/53414558264.pdf
    • http://archerelectricsupply.com/userfiles/file/75542911438.pdf
    • http://hillcountryawningsandsunscreens.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df38821548---80453729871.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae14a302f2c---damakarituzazamumab.pdf
    • http://bertrandetgastineaudesigners.fr/userfiles/file/rofivekudelazodiju.pdf
    • https://eyestech.in/wp-content/plugins/super-forms/uploads/php/files/e9bfaj0aumfavghh46tbb98m5b/wolusotobek.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+to+add+line+numbers+in+word+online
    • 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_off0000ec4a.bin
b80e4fa2838ed3ec5ef0bcf3507bf26a27534b43d6decdeab024bce8c851610e
pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4A 10724 bytes
font_01_sfnt_off000104e3.bin
c3a06ead0a2e8b28770c1ed2fa869154b78b79cdf7615e5935ac51dffafbeef7
pdf-font-stream PDF embedded font (sfnt) at offset 0x104E3 16664 bytes
font_02_sfnt_off0001302d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1302D 16792 bytes