Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a15800f5c7dda1d…

MALICIOUS

PDF

81.0 KB Created: 2021-09-08 11:58:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 035ec489c1651ee5ce90d7e458ef77d7 SHA-1: d994933bc70744f9956a6fd50b5b4dbf1b15202d SHA-256: 2a15800f5c7dda1dd899231235697db770c37bc8f51d606276284c5d4b1eb634
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users. The presence of external URIs and the nature of the heuristics indicate a phishing or malware distribution attempt, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://cructi.ru/uplcv?utm_term=reorganize+pdf+pages+online+free PDF link annotation
    • http://www.clc-engineering.com/siteuploads/editorimg/file/93718549480.pdfIn PDF document text
    • http://maurovalleferroarchitetto.eu/userfiles/files/sojixiwokake.pdfIn PDF document text
    • http://www.monts.sk/upload_images/file/rawugoguzimezebizip.pdfIn PDF document text
    • http://irths.com/upload_files/files/40597049147.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/47403397559.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d68fd8c9ee7---neziwopadatamifolu.pdfIn PDF document text
    • http://av-jet.ru/userfiles/file/57215363996.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/ddf65f8ba5bbee38f58a6ea8b0ea8edf/soperibulerefi.pdfIn PDF document text
    • http://eventechsite.com/files/files/79531990020.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021090113035073499.pdfIn PDF document text
    • http://picassogift.com/Uploadfiles/files/82518474062.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16099a3c308e02---bedutuwevubiru.pdfIn PDF document text
    • http://31kouqiang.com/userfiles/file/1629176675.pdfIn PDF document text
    • https://licorne-hotel-restaurant.com/userfiles/file/33933272506.pdfIn PDF document text
    • https://www.ijdsir.com/ckfinder/userfiles/files/lirukix.pdfIn PDF document text
    • http://pitafest.com/clients/1/13/1337b7689af00ddd847345d48bd720ff/File/kenulukagebok.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608f1ff33d9a6---24333072738.pdfIn PDF document text
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/a7320b4db929d9e10870c578a332780c/3351234409.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/nqa8bhqrs5ciqio5169239u713/nibanedupibes.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/837deee0a3f4622d2d983057b9ebb9f3/22010950343.pdfIn PDF document text
    • https://www.lipfish.no/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbd20906b3---65902852141.pdfIn PDF document text
    • http://xn--pr3b03lcdvwu9dpynqkc.com/DATA/file/20210801185216.pdfIn PDF document text
    • http://mmprogetti.it/userfiles/files/tapokaruvagidirijitidaj.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607aaa68ac0af---86240629772.pdfIn PDF document text
    • 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA3B 16652 bytes
SHA-256: 1b520c18cebc2d7835467d82465d50a5c8229beceb21febbec8b2e485b5226d8
font_01_sfnt_off00010592.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10592 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011da9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DA9 10680 bytes
SHA-256: 2ce40408b89a60584621ddd3b65241008b353812ed3e6747c0dfad97729abbf1

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