Malicious PDF — malware analysis report

Static analysis result for SHA-256 d87e119c75ff4e60…

MALICIOUS

PDF

110.2 KB Created: 2021-06-29 05:46:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d6a17708021a1f1beae1f54192d25052 SHA-1: aee8f171d1301a94357380bbf03da1547f5baf8b SHA-256: d87e119c75ff4e60cdbcced3fd78819c5193b400a1c564d390f5c2e435740233
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ClamAV and an ML classifier, and contains numerous links to compromised WordPress sites. These sites host further PDFs, indicating a link farm designed to redirect users to malicious content, likely for phishing or malware distribution. The document body is unreadable, but the heuristics strongly suggest a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9722292f77---7073114663.pdf
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/16085577f14a57---30346303555.pdf
    • http://wojno-stal.pl/pliki/file/43737296084.pdf
    • https://hanurichurch.org/ckfinder/userfiles/files/bomujuridon.pdf
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/8ef31fae2950f27ecc415e9117a56a8b/53725529750.pdf
    • http://karinameal.com/imgdish/files/9239022511.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a677134ce3d---tupuniki.pdf
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b52f3bbd2---43257442875.pdf
    • http://ibtaker.ps/userfiles/file/15543990197.pdf
    • https://www.federatedlighting.com/wp-content/plugins/super-forms/uploads/php/files/2ab9b9726fc2a143e7a1ab4190f9ddac/52880205987.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160758a20c1000---14373601206.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/919c55e113b1a3e4c736e2d091baeca2/lexomivaxudovivitaxuli.pdf
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/i1nt5dv8lphv0pka1af9h5fhfa/susegeguv.pdf
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/29s1er5htu6hguiklefj3io7e0/14711578066.pdf
    • https://ebdaatcoop.com/userfiles/files/11234301194.pdf
    • https://charlesstreetvideo.com/userfiles/file/64855002069.pdf
    • http://novaserv.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afd3dedec70---zevipukapofifa.pdf
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16090bbb9b04ba---linoxowez.pdf
    • https://oversaslogistica.it/file/notezorej.pdf
    • https://mimpishio1bet.com/contents//files/kamazazuligu.pdf
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607036dbde42c---8883459323.pdf
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/69608831042.pdf
    • http://www.sunargrup.com.tr/wp-content/plugins/super-forms/uploads/php/files/k0n5k47uripi2dh0v013saslh4/97036419556.pdf
    • https://bistro-8.com/wp-content/plugins/super-forms/uploads/php/files/6cf1b66442e58970a3aae47b89fe6715/vazasitowagatolewabap.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=oxidation+meaning+in+chemistry
    • 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_off0001499c.bin
9bb760f649da03a33a869d3ea4a74ce6f2191617e740b187ae3fc1d6807f9295
pdf-font-stream PDF embedded font (sfnt) at offset 0x1499C 11012 bytes
font_01_sfnt_off000162da.bin
3572d908c1a299e100f40b60ae6d98652a4645421af52481047329f6b0de5fcc
pdf-font-stream PDF embedded font (sfnt) at offset 0x162DA 19012 bytes
font_02_sfnt_off000193a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x193A2 16792 bytes