Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7d0e0b42a614750…

MALICIOUS

PDF

86.1 KB Created: 2021-07-10 06:29:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b5493728ce6a652d767ee134871da538 SHA-1: 3341d7043b2e6c7ce9a2b17149422d1a59323400 SHA-256: b7d0e0b42a614750a4483273f423800ab68d967c6710ba9830550eb65a98ed48
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with many URLs pointing to compromised or disposable hosting. The presence of numerous external links, some leading to PDF files on potentially malicious domains, suggests an attempt to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://2016montemayorreunion.com/clients/e/e5/e530e98a7ee505477716bae2fe71cdef/File/tusinasukujuxuxapikolan.pdf
    • https://alshamiltrading.com/alshamilfiles/file/16101798193.pdf
    • https://kozhikodedeaf.org/admin/my_files/file/59918374859.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a93dcc77e3a---lubinuzek.pdf
    • http://alliance-vietnam.com/upload/files/43562407955.pdf
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/f15591aa0956a18ee19a7a52854e607a/munejobevosododon.pdf
    • http://akicgiyim.com/userfiles/file/weketolikozodosewudej.pdf
    • http://beerskiboot.de/img/upload/file/wogepikebaxamarapap.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/vfb7t6m6tpcq48tll2cpustudr/rasomomamufisumapeluk.pdf
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/a39ec7f87627b03157c659f5cddd18f4/87080322489.pdf
    • http://www.kevinbrooks.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a086945243a---59751153462.pdf
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087778dd3a6f---16732854865.pdf
    • https://ccaquebec.com/userupload/files/51327480687.pdf
    • https://arrayamed.com/userfiles/file/93715489280.pdf
    • http://nextgt.eu/uploads/file/nipuvalubofofemowif.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5192c646f88f7371ad575b1b8a367bbc/2520027785.pdf
    • https://www.sehersirin.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f9f8cb55fb---21348412389.pdf
    • http://evohome.pl/userfiles/file/nuzofekokewutoje.pdf
    • http://fluitec.fr/ressource/site-image/files/tubugemamuxerefide.pdf
    • https://syntellect.ru/Repository/file/99042956921.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1606e0bc84990e---84992682191.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160b94e45d2a3f---97021006505.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=he+has+arrived
    • 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_off0000eee0.bin
09a156fcf95e8af0d177ffc0faeabd1d8f56851667c32ddc621cfe725706ffde
pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE0 17584 bytes
font_01_sfnt_off00011d2e.bin
3b056e61fc28098397d911817b05c1d8d3416d9d2c8e03f74d66002e7fa94f81
pdf-font-stream PDF embedded font (sfnt) at offset 0x11D2E 10032 bytes
font_02_sfnt_off00013391.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13391 16792 bytes