Malicious PDF — malware analysis report

Static analysis result for SHA-256 18eb1422b992b487…

MALICIOUS

PDF

83.3 KB Created: 2021-06-29 08:54:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8dc99786d9b1ea0d58d254469683c47e SHA-1: c60c2b039bfca4f2e48a7136a72ea4a9bc631891 SHA-256: 18eb1422b992b4870989a16b5434d78e332ae0840e5cda3b7bc0084e0daeda47
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to compromised WordPress sites and disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic firings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://ghioroiu.ro/sites/default/files/file/69667468047.pdf
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/qpefmv19k7rvr0c70tvnudiq0j/46129096264.pdf
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160917f4de2731---83770412677.pdf
    • https://datatech-int.com/userfiles/file/19392032358.pdf
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/2e2c8a7ae668f33e239636f71e6bdc18/selufojomed.pdf
    • https://www.demetagras.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608184eeb08f0---rasukuwalaxamelatupolez.pdf
    • http://argentum.com/wp-content/plugins/super-forms/uploads/php/files/pc8u40l2s8uto7628srmi0maik/tadudiwemesufidota.pdf
    • http://7166867.ru/ckfinder/userfiles/files/gijapidulexapeleveku.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c6a8ada235---zezevozutajatunadu.pdf
    • http://for-rent-aalst.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad95c0102cb---venizilifoposivir.pdf
    • http://www.predia.cz/userfiles/file/xokepotamenibukivukogike.pdf
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf74f05f35---48078519459.pdf
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/c24624e0af446207974a9afc3f16ae27/63370365648.pdf
    • http://aliglobshop.com/userfiles/file/gabaj.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb2518a4e46---8660816584.pdf
    • https://oklogistic.lv/upload/file/51234181217.pdf
    • https://snqrsl.quebec/upload/editor/file/sanuvixufesavipe.pdf
    • https://almoheetmanpower.com/public_html/userfiles/file/wudekaliwisodotexur.pdf
    • http://transsnabstroy.com/userfiles/file/14747435084.pdf
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/a176358213fb8ec0d0b7c2ea49931252/80345373529.pdf
    • http://krzysztofmalec.pl/gfx/fck/file/90295179220.pdf
    • http://lavalnerina.it/userfiles/file/kudetaripupubukaw.pdf
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16084fbd2587de---67782765693.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=insult+past+tense
    • 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_off0000e3db.bin
36c9a983b52d40ef39083912897b1262ed7076b5ef4372282ad45b607db3b57b
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DB 17612 bytes
font_01_sfnt_off00011169.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11169 16792 bytes
font_02_sfnt_off0001297f.bin
fc4341ae0ba4d403f7d26ab27224d3de9499fd1eed7b964af5c9a0357af9f221
pdf-font-stream PDF embedded font (sfnt) at offset 0x1297F 9984 bytes