Malicious PDF — malware analysis report

Static analysis result for SHA-256 e913b6e0e05307f4…

MALICIOUS

PDF

150.8 KB Created: 2021-07-02 02:41:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 617823338ee714a24b3c7ff63d4523a7 SHA-1: 7ba1e5812af880ad43bde8ee0050729935f92958 SHA-256: e913b6e0e05307f4c5eb4a14bbc6f7f4fd6e40d2471c7965d761423a3121d379
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external websites, many of which are hosted on compromised WordPress sites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' heuristics indicate a pattern of using such sites to host or redirect to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9756

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://frasertechno.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079816f96720---82397947846.pdf
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/99e094864322cebe96c93997b2817e1a/82367716311.pdf
    • https://www.phoenixdentalacademy.co.uk/wp-content/plugins/super-forms/uploads/php/files/dd0e19077596e258381ccc344c6a4d21/57752432587.pdf
    • https://scavilecis.it/userfiles/file/pavanulowuf.pdf
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/mlbm0feuk0o27e3jf53f62v9uc/moturojif.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/rgup3u3srl34s0477trf19kud3/foxusalu.pdf
    • http://aberdeeneyes.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ca62edcf---23597365930.pdf
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/160a3c60e79db8---20446228321.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7e0aa1fa5---fovanizugaxefamoseze.pdf
    • http://wijnhuis-vaessen.nl/site/data/ws/files/neror.pdf
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/df4b8a39be91555bd994751da4a0f3c8/89805077440.pdf
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/357fb65c285d527c177f6d34a9e08270/rirofevufes.pdf
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609dd1d23d00b---9337973484.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/9qukm5jiscggt5tfnatuphnmid/49070053299.pdf
    • https://alkalacarservice.com/public_html/userfiles/file/wafewemokiduz.pdf
    • http://www.contectrade.hu/fckfiles/file/27013013523.pdf
    • https://artlabjo.com/userfiles/file/polemevojegavofazo.pdf
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/41555329873.pdf
    • http://vtdsbinhthuan.vn/public/uploads/userfiles/file/saroxajodirizuximi.pdf
    • http://robertsrucker.com/clients/7/7f/7f5ecd1287ec2152c36a7dc1808edcbf/File/21207750933.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/16076ea712de17---13460116158.pdf
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160983dceecc9c---12054530108.pdf
    • http://miroslaws.com/ckfinder/userfiles/files/sepagoliwutu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e089343158---36749913082.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=bruce+springsteen+and+tom+morello
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001d10b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1D10B 16792 bytes
font_01_sfnt_off0001e922.bin
87c2bc09cb839518fd6d6f3047ac9234e8cc4fb58c673e4c0bfaddbfd9839c72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1E922 11012 bytes
font_02_sfnt_off00020289.bin
86d95392f4914c57e77436801564b713772a4fe0e910499b2acdfc743a4450f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20289 20376 bytes
font_03_sfnt_off00023609.bin
9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x23609 16092 bytes

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