Malicious PDF — malware analysis report

Static analysis result for SHA-256 11293ab0b16956f7…

MALICIOUS

PDF

104.5 KB Created: 2021-08-14 16:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: 722866465ca65c95055b81550ac15668 SHA-1: 0fe556ac2405ef6396af5ce76bd52c5a9ae2f8a6 SHA-256: 11293ab0b16956f78fc5e88d1a4dbb0335e585f9876256326e1ae2eb81ebf6f9
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, with numerous URLs pointing to compromised WordPress sites hosting further PDF files. This suggests a multi-stage attack where the initial PDF serves to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/94149b25eab6bbede1eb96f0c7b82225/jujidogoraz.pdf In PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160e0b05a09f50---legugojiwa.pdfIn PDF document text
    • https://ctsgroups.asia/images/file/82475507168.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/ropizotarizemezenasiwim.pdfIn PDF document text
    • https://menlopark.com/wysiwygfiles/file/dagurokafosum.pdfIn PDF document text
    • https://zazilha.com.mx/wp-content/plugins/super-forms/uploads/php/files/98875f29da6cff939dd7872bc8e1fc29/vudis.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160c0aa6547325---9362602442.pdfIn PDF document text
    • https://autoteam.in/ckfinder/userfiles/files/lusajojew.pdfIn PDF document text
    • https://oiweld.com/wp-content/plugins/super-forms/uploads/php/files/56d323a5c6744be9c88777e6f09675dd/fimuxu.pdfIn PDF document text
    • https://www.m2asolutions.com/wp-content/plugins/super-forms/uploads/php/files/f0818bfee7940675096014b568028b83/44919469779.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/jipawukirer.pdfIn PDF document text
    • http://www.britocunhaadvocacia.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/16075efd610faa---rukasata.pdfIn PDF document text
    • http://distributoram.com/files/file/97421480671.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/160745e9e87106---paguzedenowoxa.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f59d486be28---50448105796.pdfIn PDF document text
    • http://popnmusic.fr/userfiles/file/dadufojuketope.pdfIn PDF document text
    • http://purifoy2020.com/clients/1/11/118d8b7ee1ea4bab8fb19da95c56260f/File/diwor.pdfIn PDF document text
    • http://hungthanhauto.com/luutru/files/wafuserowunupif.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/gafosabatapotozi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/gomenowirigomu.pdfIn PDF document text
    • http://inwama4.vn/webroot/img/files/89439712778.pdfIn PDF document text
    • http://irishheritagesociety.net/clients/7/7f/7f3653e4c5d791bf76f28d2bf9929747/File/rupimurafixopogakeleveg.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/34582808452.pdfIn PDF document text
    • http://www.grundys.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160e27cfbd7cf7---22829394067.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=multiplying+and+dividing+positive+and+negative+numbers+worksheet+answersPDF 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_off00012f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001472f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1472F 18576 bytes
SHA-256: cf0110d0233ac9727a67d4aec849979e37110059ec553a8261326c1a6687fce2
font_02_sfnt_off000178c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x178C6 11428 bytes
SHA-256: 4d0777c0582e597c338d1689795d02f6148485b73d00456b71de3dcc18b5f7f1

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