Malicious PDF — malware analysis report

Static analysis result for SHA-256 66c54260e71a4151…

MALICIOUS

PDF

98.2 KB Created: 2021-07-20 05:52:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 1928a6030967a481d1841264d5213bc6 SHA-1: 9b2e9e14ca5954bac38ba19c4c4169d2f6537d79 SHA-256: 66c54260e71a4151e590f9831c801ef4afffc519bb02c4a21d3fa211b030a2b8
156 Risk Score

Malware Insights

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

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The file contains numerous links pointing to compromised CMS upload storage and disposable hosting, suggesting it's a link farm designed to redirect users to malicious sites. The document body is heavily obfuscated and unreadable, indicating an attempt to hide its true purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://lightspec.com/wp-content/plugins/super-forms/uploads/php/files/7520daf63c4f125e26089927252cc081/91970951351.pdf In PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607edced10872---51120124724.pdfIn PDF document text
    • http://yuha.be/_files/file/pudude.pdfIn PDF document text
    • https://bjjewels.net/nbloom/fckuploads/file/nokowidita.pdfIn PDF document text
    • http://broadviewlibrary.org/uploaded_bvlib/file/roverugi.pdfIn PDF document text
    • http://iltorg.ru/upload/file/zotiri.pdfIn PDF document text
    • https://www.geosuiteonline.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d714b6aa619---9423149098.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zusufajesedirakumoxugi.pdfIn PDF document text
    • http://purpledoorchurch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a60dfa2c0a---25501485827.pdfIn PDF document text
    • http://charivne.info/images/file/97085948627.pdfIn PDF document text
    • http://cageart.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608c30ef1e678---35224975732.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1607d21708c550---romutinevukagexogojetojas.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d410243e6ef---kemejuzexufakukuti.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160beada3af3f9---vizozabarubadulusu.pdfIn PDF document text
    • https://winston-woodward.com/wp-content/plugins/super-forms/uploads/php/files/958424c73283fa7d22225e7388de05e2/zanologipakubulufezu.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/e9a25f9c039a25116593f0f516c30e82/popuvowufuzojakoloratifa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b83fb958c6---vajatajovoxoxod.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609b4a09e7a79---podudasubanimumakosepol.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/popukabadiludibewanofibeb.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/e99bef79b1c8d5cfc1e6e7e60c6eabdf/13595151172.pdfIn PDF document text
    • https://envomask.com/wp-content/plugins/super-forms/uploads/php/files/781499d160b91d2a178be4908e8d068e/vupisepalubunapasaj.pdfIn PDF document text
    • https://www.mixedclass.com.au/wp-content/plugins/super-forms/uploads/php/files/gfr6pio2v61445cqsitpnsasrk/ramozit.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=diy+out+of+wastePDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011f1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F1A 17388 bytes
SHA-256: e55a829950db0227730c4ddcd873efbd1a39c92adfe988ca25e4ac7b69d570cc
font_01_sfnt_off00014caa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14CAA 10256 bytes
SHA-256: 964b8b3f3ce7f7bf49a00ecf459d5b6108faf1e206945e578a6dee7c49af2657
font_02_sfnt_off00016401.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16401 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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