Malicious PDF — malware analysis report

Static analysis result for SHA-256 87c48db81a808c91…

MALICIOUS

PDF

84.4 KB Created: 2021-06-26 19:09:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 397e046aba3018a435fa9b7c678d1fa2 SHA-1: 5b9604dfa0f2a408ceffb009227cbcb3a0a604ec SHA-256: 87c48db81a808c91d159a0053810fc1768e04c7c97421d2c2c309e11334cfa85
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains a link farm pointing to numerous domains, many of which are hosted on compromised CMS platforms or disposable hosting, suggesting an attempt to obscure the final destination. The presence of external URIs and the overall structure strongly suggest this PDF is designed to lure users to external sites, likely for phishing or to download further malicious content.

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 https://ahreco.com/uploads/news_file/89760534153.pdf
    • https://archcosmeticstudio.com.au/wp-content/plugins/super-forms/uploads/php/files/3e17812634e5145df0bcfe823e9c7aa8/nikorabitikomad.pdf
    • http://www.alquilerbares.com.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16083fb1917d0d---65162636977.pdf
    • https://tidaksusah.com/contents//files/kigunuxoketowen.pdf
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160911a93931f2---16077669625.pdf
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160712b3e72c0c---89167991420.pdf
    • http://lysfyyy.com/upload/files/89640201813.pdf
    • https://angkorphotographyguide.com/userfiles/file/regozawo.pdf
    • http://amexeuro.com/an3_Uploads/file/tusugupapa.pdf
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b47a368a7b7---wobebujital.pdf
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/16096cb9ecb3fb---54846798589.pdf
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b060dd75a3c---fejulidilufew.pdf
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/bedf55740c19687f8898156b601a1459/muxedetezesapi.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/96a8e16274dd5738b5f346907bb64f1a/15812797662.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/hkbkfh76tv6f800gksc4ipfv5s/jogevurapo.pdf
    • http://rittenhousereunion.com/clients/a/ad/ad7d26974070b67854a29702aed78614/File/76832203613.pdf
    • http://jjinline.org/file_upload/file/84021460844.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/e193ac71ea11581e2dc94f9d5b51474a/robexerikidepovijoru.pdf
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/s84538h8ulh3gjod4stq1mt5q0/38324226705.pdf
    • https://theatresaucinema.fr/uploads/file/17735283980.pdf
    • http://xinyuemu.net/assets/202106/files/20210604215710296897.pdf
    • http://crisismobile.com/ckfinder/userfiles/files/5412387662.pdf
    • https://mattweidnerlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082f227dbb8a---53513784489.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=easy+step+by+step+easy+how+to+draw+a+horse
    • 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_off0000e85a.bin
956d007fa23fead1cf5c56ff8cc24aed139fadd4a9e964e3080cbe448ba8a8dd
pdf-font-stream PDF embedded font (sfnt) at offset 0xE85A 10568 bytes
font_01_sfnt_off00010075.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10075 16792 bytes
font_02_sfnt_off00011887.bin
b5669c427e4aa904b3b91e63398c21587f5856ca4beecb5625a2531bc9b0048c
pdf-font-stream PDF embedded font (sfnt) at offset 0x11887 16296 bytes