Malicious PDF — malware analysis report

Static analysis result for SHA-256 932c77fd27b0205b…

MALICIOUS

PDF

87.8 KB Created: 2021-07-14 04:51:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c6dd0213495aac2b2ddbb145f3ab5ac SHA-1: fae6563855eef67ac7becc803bb3b20ee3f6ec3c SHA-256: 932c77fd27b0205b63a96e0cc3d52747429b032bdd9f1b2a1ad888e82644ccad
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, flagging it as a phishing trojan. Static analysis revealed it functions as a link farm, containing numerous URLs pointing to compromised WordPress upload directories and other disposable hosting sites. These links are likely intended to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/16086c6b586f57---kitamomuguxafupomivu.pdf
    • https://www.hungarianassociation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67772bcce8---paruzabapatewoluzureda.pdf
    • http://cheumst.com/upload/fckeditor/file/93397715792.pdf
    • https://99shayari.in/userfiles/files/8248855221.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070af4c84a4d---66645318382.pdf
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160876a7f950cf---39241476830.pdf
    • http://harposwebdesign.nl/app/webroot/files/userfiles/files/luwepovogo.pdf
    • http://www.alfapilates.pl/upload/file/wolonor.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608fca4aaf6b6---rixirowavefemala.pdf
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c047ceadf4e---bebotexenemiteno.pdf
    • http://oneself.pro/wp-content/plugins/formcraft/file-upload/server/content/files/160bc80ec650c3---80571213531.pdf
    • http://logansport1971.com/clients/4/42/424235dfd0fdcd2d3cc2afd1e16bb83e/File/poganex.pdf
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160e33b7488a1a---82735668333.pdf
    • http://xn--b1ahhafccpgkb2bxo.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/08082404790cfc7ad2b2f66a963a116a/68015482825.pdf
    • http://elitvorota.ru/f/file/90604230349.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/kituwo.pdf
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a22f397b2d---9742939287.pdf
    • http://www.nowsingapore.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/160bcffaa12b03---71045598732.pdf
    • https://ferado.vn/userfiles/file/46788791845.pdf
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/5fae43fc3b993544abb40a4c289e9257/tuzagunipodo.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/g5661bi1dc871er049a13lks34/59580242926.pdf
    • https://lsp.od.ua/wp-content/plugins/super-forms/uploads/php/files/glik4u0q01979m5mt0b7o9dlq0/wupifudesegemimozi.pdf
    • https://x-software.cz/data/file/ribejazigawupu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=carry+out+service
    • 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_off0000f61a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16792 bytes
font_01_sfnt_off00010e31.bin
b45efdeda069bc17d218985070fb0c2a654a630676bc1b9318783a056e519f33
pdf-font-stream PDF embedded font (sfnt) at offset 0x10E31 10384 bytes
font_02_sfnt_off000125eb.bin
93b596e18051c57ecde0cca4b0c3631d7796d81af5b82bb443d0cf6a6613689c
pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 17012 bytes