Malicious PDF — malware analysis report

Static analysis result for SHA-256 33caa51b45cdae8a…

MALICIOUS

PDF

102.6 KB Created: 2021-09-05 03:07:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 086d08819f5ff104314791114478feba SHA-1: 7e40e502c319b9daa5a721db622a5d20b05187f0 SHA-256: 33caa51b45cdae8af90283ef323024850c66b976deb0343313c8ff989f89629a
156 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate the document functions as a link farm, directing users to multiple external URLs, many of which are hosted on compromised CMS upload directories. The presence of numerous unknown URLs suggests an attempt to distribute malicious content or conduct phishing operations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9888

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 http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/16092428b81a56---mufusonenobilet.pdf In PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/64938535533.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/cab3a17f5a97a8909c687915bbf58074/60277315205.pdfIn PDF document text
    • http://montpellier-businessplan.fr/mbp/upload/images/images/upload/ckfinder/83518397270.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/82a085a3e14f16bfe625c80b571468e2/papafe.pdfIn PDF document text
    • http://regimhotelierbucuresti.com/images/userfiles/nagedak.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b44b4c5a70---xulabitel.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/28ot1okbd1a1jqjpfqsqi43kns/68747133877.pdfIn PDF document text
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/gnhprbbh1n3fpa6bftprffds4v/junorakuniwevijitidaxiki.pdfIn PDF document text
    • http://nbpcpentecostalchurch.com/clients/65183/File/34752644301.pdfIn PDF document text
    • https://cornerstonelaw.eu/userfiles//file/67116460816.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/14474065552.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1607a4d2c46367---93653420518.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160838b60cc2fe---fazenote.pdfIn PDF document text
    • https://baodinhsolar.com/wp-content/plugins/super-forms/uploads/php/files/g9ke3n4sankepflslgbnbfl18u/vedekubelivemo.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/disar.pdfIn PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/3330279963.pdfIn PDF document text
    • https://securitydm.rs/slicice/file/guwidigefuloradetokexebu.pdfIn PDF document text
    • https://www.sevgiliyevideo.net/wp-content/plugins/formcraft/file-upload/server/content/files/16092784db81e2---gavomakexevaviv.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1607c22778736a---nawuxopip.pdfIn PDF document text
    • https://gearforfree.com/wp-content/plugins/super-forms/uploads/php/files/pp1k1s82754iksvjgkdf69ofi2/nowagoxuwefapolusaneje.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/jirepefitu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=highest+mountain+peak+in+the+world+pdfPDF link annotation
    • https://bxthirteen.wpengine.com/wp-content/plugins/super-forms/uploads/php/files/691b6c0936698ccded9b98769453056b/wipusasete.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

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10355 11212 bytes
SHA-256: 4b7e69650e6894e0d9db2b834fd3ec0652d1f44a4cd1bae3edbab29e7fb03f46
font_01_sfnt_off00011d32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D32 24408 bytes
SHA-256: 67278e7f330c91aa32ecdca5aeea8e8387e5b8517a34fba3e48bab274483e2cb
font_02_sfnt_off000159c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off000171d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x171D2 17420 bytes
SHA-256: 8195806383d371a8a09edfcc1815040743786cab7b7eacc68fc1472805a107b1

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