Malicious PDF — malware analysis report

Static analysis result for SHA-256 42cb0ab153aa79f8…

MALICIOUS

PDF

101.2 KB Created: 2021-06-26 10:49:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4d6ebebe73a2f8e73f229915fb32fa35 SHA-1: f3ae0f2b884bfee1d58c48efffa926aeae204c59 SHA-256: 42cb0ab153aa79f8d2103f6935457c7d619d74352cf5590f6e47904be14169c5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and points to compromised WordPress upload storage, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure and URL patterns are indicative of a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://coretry.ru/uplcv?utm_term=mhw+monster+icons+meaning
    • http://www.pilonidalsinus.gen.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16084a55c706ba---gadenawudegapejewan.pdf
    • http://trineckevzdelavani.cz/webpagebuilder/ckfinder/userfiles/files/78059610400.pdf
    • https://terminal.hr/userfiles/file/tevuletetevev.pdf
    • https://www.hadlowsecurityshutters.com/wp-content/plugins/super-forms/uploads/php/files/5c8ece1c528adcf44a3f8e7a4cd25205/12626480720.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607bcee073ee5---sunajo.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160a754bf605c4---79984450835.pdf
    • https://unitedcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cf2a9e6e5e---tajafolezedadepi.pdf
    • https://vinacomvietnam.vn/uploads/news_file/15239537523.pdf
    • https://socialacademy.gr/wp-content/plugins/super-forms/uploads/php/files/e1a5109803cf8c04157de5317fd10086/tapafakolipaxoso.pdf
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/160994e92be937---xejefudikobetij.pdf
    • http://lapenya.cat/imgjovesnaves/file/99005023651.pdf
    • http://webscape.co.bw/wp-content/plugins/formcraft/file-upload/server/content/files/160854cb496ffb---sazurirowifupajalibefal.pdf
    • https://elitteaccesorios.com/wp-content/plugins/super-forms/uploads/php/files/pi4uv3k9dlul5qg2aa4paqbpoc/lutadidekokafopavawezidu.pdf
    • http://suamayin.biz/userfiles/file/pikonovakowazeb.pdf
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/c0a199824b2001d5808ba1468ca1451b/75381389684.pdf
    • https://canevastoilestjean.com/upload/editor/file/vokagoxebokotatewatido.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/hd8n723c4sfql8sj6bhqlout0l/fusokot.pdf
    • https://tamtam.com.ua/wp-content/plugins/super-forms/uploads/php/files/90824a3af2b0cdb49dd7b439a65711a0/40296965594.pdf
    • http://vhshf.de/File/jizopu.pdf
    • 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_off0001275e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1275E 16792 bytes
font_01_sfnt_off00013f70.bin
79404160b17f87321f757bda72223c103380523d2fe8eaf576a8d638029819ec
pdf-font-stream PDF embedded font (sfnt) at offset 0x13F70 18960 bytes
font_02_sfnt_off00016f6b.bin
201554a14bb92c2c3aa185b6dbe458228218780b0ea457a0511b8f7bbd446cb7
pdf-font-stream PDF embedded font (sfnt) at offset 0x16F6B 10712 bytes