Malicious PDF — malware analysis report

Static analysis result for SHA-256 aed1f54dd6200177…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 14:01:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ca1e303dddeffa16040cdbfc3155d4a3 SHA-1: 22c53e424da2520a1d1e89b389102c7db354b8e1 SHA-256: aed1f54dd6200177ea05a87efca91835fa9ae07e29a9167d6b9238956aefff41
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous URLs pointing to compromised CMS upload directories. These links likely serve to distribute further malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614cfe7c43fbd---wevebekefumubawulukupabo.pdf In PDF document text
    • http://www.introspekta.si/ckfinder/ckeditor_uploaded_files/files/wovarafininipe.pdfIn PDF document text
    • https://maritime-models.com/userfiles/file/60375578937.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/29514951564.pdfIn PDF document text
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144245f3ac33---gegunulipofojixaluvep.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/e0b68983e1d65816345b098aaa2d3c43/89406568537.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/b5eb63d8403841e27100e1a8f1253c5f/68688051694.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/75886705455.pdfIn PDF document text
    • http://preiss.at/upload_files/files/19011367661.pdfIn PDF document text
    • http://namkhoabacninh.com/images/files/29349817324.pdfIn PDF document text
    • https://xn--23-6kci4asohe8k.xn--p1ai/userfiles/file/tanunivugu.pdfIn PDF document text
    • http://makesomenoise.hu/upload/file/7666040021.pdfIn PDF document text
    • http://www.c-l-r-p.com/admin/ckfinder/userfiles/files/45751816169.pdfIn PDF document text
    • http://hjhchem.com/upload/files/muzakuxozuzubi.pdfIn PDF document text
    • http://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/161497ce56c22d---vutemokefelezanova.pdfIn PDF document text
    • http://prompol.com/media/file/56061814429.pdfIn PDF document text
    • http://www.armstrongre.com/files/files/93030550290.pdfIn PDF document text
    • https://micsys.in/userfiles/file/fatapojepof.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ssg5g71173fjubhgm1v6ev68ap/puzonakenosativ.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/41405057993.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142393c803e5---fakepajudanow.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/41615898700.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/96511947724.pdfIn PDF document text
    • http://tetraeng.it/userfiles/files/90983976741.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=fifty+shades+of+grey+online+downloadPDF 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_off0000b2c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C9 17468 bytes
SHA-256: 683b31ed7b59a1f538ddc68d411499c19158ab66a560b34382788c657cd723e7
font_01_sfnt_off0000dfe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f7fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7FE 10812 bytes
SHA-256: 6d4c8ace196651044972418e0c9abe07b631f76da3ecc7b0a4db0aa636bbfe8a