Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e52df3d2f677c61…

MALICIOUS

PDF

88.9 KB Created: 2021-08-21 00:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bf790aad70af83769491e120f5c95e21 SHA-1: 9b249c02aa341d58e2807bb79894343af5892ae7 SHA-256: 1e52df3d2f677c6116bfec0f77f42bcbd60956e8acaf7870f67de5304569c559
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a link farm pointing to compromised WordPress uploads and other disposable hosting, suggesting a phishing or malware distribution scheme. The presence of multiple external URIs and a link farm heuristic strongly supports an attack pattern focused on luring users to download content from untrusted sources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9933

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://mccartha-cobb.com/userfiles/files/damofoliwusomejel.pdf In PDF document text
    • http://a2itsolutions.com/chop/multimedia/userfiles/file/46698574910.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/2c887e677e93490a981d60bcc7be133e/45310600881.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/16111983668c61---74890084095.pdfIn PDF document text
    • https://tomas-music.com/contents//files/xagusipidusebow.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cbcfc71e84---26605466757.pdfIn PDF document text
    • https://freedomtampons.com/wp-content/plugins/super-forms/uploads/php/files/90b6b3b79e1f86b2ea91d8c4ab2748c0/miduruf.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/af901d421b416ce6781fb01fc03fca18/rediferuwegutat.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160d98f3bb498e---jubov.pdfIn PDF document text
    • http://lyjclinic.com/ckupload/files/59573106149.pdfIn PDF document text
    • https://angel-juicer.com/FileData/ckfinder/files/20210808_4D2047DD0995CFBD.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1475028197---lakejuxudonid.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/2aad65698b185ea37b8db5ac3efca927/31128531198.pdfIn PDF document text
    • http://xn--tnqz8hz5cb8l.com/upload/files/linulubolujowutefavu.pdfIn PDF document text
    • http://wijnhuis-vaessen.nl/site/data/ws/files/93295255278.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/035u37mvg9at6675tqk73676k2/pajepe.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/16085192c9aff2---zurigeduminosebur.pdfIn PDF document text
    • http://thevelascofamily.com/clients/11614/File/8738952384.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/77425710669.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/7fcb8551f81b133d42f44f14c849e872/fepidoj.pdfIn PDF document text
    • http://walker-doss.com/clients/4/45/450b4a4af5ff3f13851793278d9c7ef8/File/ponivuloforokotosukutif.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/tamezile.pdfIn PDF document text
    • http://arabic.cz/ckfinder/userfiles/files/lisovisuwabubimupalaguv.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/ruzefuse.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=background+zip+file+for+picsart+fontPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f61a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF61A 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855
font_02_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 11100 bytes
SHA-256: 44a4c662d929a8395a096633d06655a6e4aee364adf2fa3d9f7808f780a609f3
font_03_sfnt_off00012628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 16928 bytes
SHA-256: 2b8d9c88a90f44115b8ae5b96f2215b4431c76f96c030c05336aa7b8ead56b76

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