Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6d17c2e32d7971c…

MALICIOUS

PDF

117.0 KB Created: 2021-07-13 21:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b704623a7f483f4464b3d1b9c56f506 SHA-1: b831dfd59d59ddd664bd336ad386903924637257 SHA-256: a6d17c2e32d7971c3f3e9ad606f81ac48d8a0ef9c9486202e816e667906eee7c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links pointing to compromised websites, identified as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on potentially disposable hosting and compromised CMS uploads suggests an effort to obscure the ultimate destination and evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/160c6d283af6a8---rogisolufoput.pdf
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/3cf8af61c68bdc19eb2e9dece588e903/sofirilut.pdf
    • https://osakadentalcare.com/contents//files/39569770517.pdf
    • http://1parareunion-club.com/clients/4/48/482fc251494624b09083a87f212a12d7/File/30657753147.pdf
    • http://koryosushi.com/uploads/files/degovesukivalamobu.pdf
    • https://www.simcoerecovery.net/wp-content/plugins/super-forms/uploads/php/files/dt2hh9jkttf78jftqa94dnsigl/bugab.pdf
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607022d168304---95854655417.pdf
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607642b0cd4e6---86009598980.pdf
    • https://lasanisports.com/files/18399991620.pdf
    • https://gtsonline.nl/wp-content/plugins/super-forms/uploads/php/files/a1a715cdhghs8did1f4vq3upav/61452479481.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/77ad3a21f94cb2cd6d36d12f29c0e857/wefowijewokusifedetuki.pdf
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/1a9eab2a2ca2922f820a400cd86789f9/18456720614.pdf
    • http://titusrelay.com/clients/e/ef/ef304ccc03541e9e6382bef5f13b0a7d/File/52065129967.pdf
    • http://www.yourhealthyourchoice.org/wp-content/plugins/formcraft/file-upload/server/content/files/160862226df312---pelupilof.pdf
    • http://gourmethousemacau.com/UploadFilesfile///barewukimurot.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b98b28f2f3---kujaresamelibebed.pdf
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160735453ad65d---pevabelikuk.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/aa9055452ab7aed55d999055eec0883f/rigifolegivana.pdf
    • https://www.reliancecareuk.com/wp-content/plugins/super-forms/uploads/php/files/d73f8908686cefcc13014b2b3b511619/defotoz.pdf
    • http://hakkabrothers.com/userfiles/file///25726672010.pdf
    • https://soechi.net/userfiles/file/13646934662.pdf
    • https://szaniterplaza.hu/ckfinder/userfiles/files/nawuwasivese.pdf
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071cd86ade68---42553056180.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=internal+structure+of+earth
    • 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_off00016a13.bin
cd2a0f34393738dba76392aeca0a95023321b169c65fd41606f1afe01decbdeb
pdf-font-stream PDF embedded font (sfnt) at offset 0x16A13 17260 bytes
font_01_sfnt_off0001971a.bin
cfe952f261fd2d2eeccf38c6c7de0311cd1fc85fa7a51b1bcf97fc6705bf197c
pdf-font-stream PDF embedded font (sfnt) at offset 0x1971A 10392 bytes
font_02_sfnt_off0001ae9a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1AE9A 16792 bytes