Malicious PDF — malware analysis report

Static analysis result for SHA-256 37916e0a75b86640…

MALICIOUS

PDF

78.3 KB Created: 2021-06-17 16:52:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b73f75b3c7d51ec4a9e984a7fed5ddc0 SHA-1: 011212dbed43bf96e94321c5fca5ec9805b8fe0a SHA-256: 37916e0a75b86640fa9312eb5f3f344cd1a53cff8837c389d102f7826d9a2305
156 Risk Score

Malware Insights

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

The PDF document is flagged as malicious by ML classifiers and ClamAV, and contains numerous links to compromised websites. The document body, though heavily obfuscated, suggests a lure related to 'shortcut keys in premiere pro'. The presence of multiple links to compromised WordPress installations indicates a likely phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160718c6b68798---joxodowetolagolasej.pdf
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/4e529435690251d90688463280a8c0b6/20222335947.pdf
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c12d1ec0675---84106390828.pdf
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092284597b18---25492513679.pdf
    • http://cateringkieuan.com/uploads/userfiles/file/fipugogupejinawosugefoji.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85757e426---38057854889.pdf
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160774e3f79f60---59322833822.pdf
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1606e85b9c0f10---63929764156.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/6068737f8652c927586ae6f51c1ead63/neduk.pdf
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606f54aed92b2---kulitilag.pdf
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160711f42d770f---kexofifoda.pdf
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/cf7f574fec57b171a28cf4d627e02119/89041021906.pdf
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f75934cdde993f8532ac03de536af5fa/kosudelu.pdf
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160901214a2adf---10072628442.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/44629783484.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=shortcut+keys+in+premiere+pro
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f527.bin
a5bee045814e1de82ca3a4069ac1b38824a755073226c8616234633c0cd887f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 5200 bytes
font_01_sfnt_off000106ba.bin
ca91d9888a990a68b3de270899a872db8d9bbfcc18bcebafe16b55c621c445b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106BA 11060 bytes

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