Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfee79000e4e0358…

MALICIOUS

PDF

74.4 KB Created: 2021-07-02 13:45:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 52eb3dee0596bc4063eed78d5a0bfe42 SHA-1: 4e1f4a9980913a272a9f72c94ce4e070d031c803 SHA-256: cfee79000e4e03582396d1fa9f9b9e34b97b57629e395a03a0735be06dbdddd1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to other PDFs hosted on compromised WordPress sites, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. The structure and URL patterns are consistent with a spearphishing attachment used to lure victims into downloading further malicious files.

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://www.letspassdriving.co.uk/wp-content/plugins/super-forms/uploads/php/files/vmkk84l4i5t9rj4uoj3nfvlo3f/fosuvusawalaxodukomaju.pdf
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/160abab8a7c374---98318143201.pdf
    • http://photo-preiss.com/upload_files/files/farudedafinulawerefolaj.pdf
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/9887ec88d04941a958296df8793f15a8/zutepunesokigexedufozak.pdf
    • http://famcareconnect.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607f7b9e3018e---davumizaxigigem.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160b4881f60668---57032605096.pdf
    • http://bkdesign.ee/userfiles/file/fegupifipapawujisofalegom.pdf
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a5c56335d---44853826980.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c7dd0ae200---levep.pdf
    • http://eurekaelearning.com/upload/news/file/20294711233.pdf
    • http://alkanboya.com/files/file///judisagosegareb.pdf
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a62a94be723---jolowumudowizewenekaw.pdf
    • http://sanarina.de/ckfinder/userfiles/files/63768007327.pdf
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/25f2bec99b19234282e661d6d6dd9fc1/kimavagapugoneluderet.pdf
    • http://0-50.ru/userfiles/file/25275465395.pdf
    • https://bobecoingatlan.com/uploads/editor/file/memazenowa.pdf
    • https://actor-conseil.com/files/file/bukitug.pdf
    • https://chezgregoire.fr/userfiles/97867844109.pdf
    • http://www.heksan.com.pl/file/1068783613.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/q6lkr96n0oob53dqrrsjo8dr24/letogagalagifoj.pdf
    • http://zulassung4you.de/bilder/file/18703711809.pdf
    • http://juniorsmagazine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f860a322c3---4744018162.pdf
    • http://informerfitness.com/wp-content/plugins/super-forms/uploads/php/files/8251ce506e64e4a76945be8f71de1035/34730843697.pdf
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/lbm9n1o7scg4jd75e5m224a7h1/nirutazufilitafol.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=6+sided+figure+is+called
    • 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_off0000c4dc.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xC4DC 16792 bytes
font_01_sfnt_off0000dcee.bin
f4e76a65baa8ffa9feed32ce807ea90418a57e3fefef07ef6c5c20af2cf79680
pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 15632 bytes
font_02_sfnt_off0001050d.bin
13ff89e6a059b7e873461aff915dd7534c64458578725cad68b9af30ab95883d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1050D 10500 bytes