Malicious PDF — malware analysis report

Static analysis result for SHA-256 8acc21eebc29c9c8…

MALICIOUS

PDF

92.6 KB Created: 2021-07-16 20:30:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: d37871bd6adb0ea2ab0cc3cda9fe6f90 SHA-1: 1ed15e5ac9fb1a859f214cf60b780ee53a3e4dc4 SHA-256: 8acc21eebc29c9c87d7ce32ee83c6a324f1a9ef13fbc1df8a2a4ee728796b9b4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The file contains numerous links pointing to compromised WordPress upload storage and disposable hosting, suggesting it is part of a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. While no scripts were explicitly extracted, the nature of the links and the PDF structure strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b46ebe14e48---86359637551.pdf In PDF document text
    • http://libron.pl/fckupload/assets/file/10028309592.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160dbe2d77409a---98779953500.pdfIn PDF document text
    • http://vibrosystem.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160771cc45b63b---bumumafu.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609eea7359920---wedosi.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160a00c0630b07---54041524313.pdfIn PDF document text
    • http://tbvshungviet.com/upload/files/29292378864.pdfIn PDF document text
    • http://altaprecision.com/userfiles/file/kidosekujasojanikowafinez.pdfIn PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/wuzewomenejonesojej.pdfIn PDF document text
    • http://asupuro.com/user_data/image//file/75692990452.pdfIn PDF document text
    • http://georgefamilyreunion.org/clients/86186/File/womapimow.pdfIn PDF document text
    • https://fablab808.com/nbloom/fckuploads/file/punufopebul.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/vegilojunakodosixekanes.pdfIn PDF document text
    • http://www.hptindia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa0de5ab79d---71116939420.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/569aec223b37f5b6f6e6dfa41fe7e938/redowosamuvorizujifinirum.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c9a4b62a4dd---pazulu.pdfIn PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/fa943fd10c5ee2d51a30fc71ef25a8b9/98328229494.pdfIn PDF document text
    • http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/53d9d66a14b3dfff11efcebe92c441fc/72544305214.pdfIn PDF document text
    • https://daismene.it/file/patesebizuziluvipovakekex.pdfIn PDF document text
    • https://hpx.com.ua/wp-content/plugins/super-forms/uploads/php/files/b3402e7d7f0f4606e887ae1b9a78bca4/53405561808.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/81291a8b1aaee9cf17ae174c80008c4c/siratakuronazegop.pdfIn PDF document text
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/jggo0mnvbbmm4i1ia7478e0qcn/dawesuvasisorusar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=black+and+red+wooly+caterpillarPDF 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_off000107ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107ED 10684 bytes
SHA-256: 2c3ba99f5efce7daa2571b66484f03701df093b4e4c6533c1df69daa58544b30
font_01_sfnt_off000120a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120A0 17128 bytes
SHA-256: c7f906b52ab8caeee0feb56c23592ef1846ff6131b0758e70c59f8b80e8db2c8
font_02_sfnt_off00014d55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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