Malicious PDF — malware analysis report

Static analysis result for SHA-256 25ac79705e6fe552…

MALICIOUS

PDF

94.6 KB Created: 2021-07-18 01:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 7306465b0bda815db70b8c91bb539ecf SHA-1: e9260941ee0905913f396fac930fea603e62b2c6 SHA-256: 25ac79705e6fe552b1fccdfdcd0052c8527104319a2f18f45a53970448497c27
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, with numerous URLs pointing to compromised WordPress sites. These links are likely used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://rusiuojigalvoji.lt/wp-content/plugins/formcraft/file-upload/server/content/files/1606f531ae2955---45567964878.pdf In PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac3f7ee4f00---zejolobarixapele.pdfIn PDF document text
    • https://serwisnawigacji.pl/userfiles/file/79172605476.pdfIn PDF document text
    • http://jaatkinson.com/userimages/zusutununefifinu.pdfIn PDF document text
    • http://www.ecostroyservis.ru/File/wixorexiposufakaxilakit.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/f426ca9db845932e925b908ebdbdc11d/98565578618.pdfIn PDF document text
    • https://www.apartamentselsllacs.com/wp-content/plugins/super-forms/uploads/php/files/qevrofsdib3am2eohnksbujaul/wejudume.pdfIn PDF document text
    • http://dmscsmartlifeblog.com/userfiles/files/45211760116.pdfIn PDF document text
    • https://wacee.net/wp-content/plugins/formcraft/file-upload/server/content/files/16076ade3d30be---jepadobimusolu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/4b242b7f83b58ffd25dd88f932be3b45/33676832872.pdfIn PDF document text
    • http://szentistvanpatika.hu/upload/file/22143120747.pdfIn PDF document text
    • https://www.kngroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c83accc49f---bejoj.pdfIn PDF document text
    • http://funperm.ru/content/file/60439343291.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/515cc3e391b2db3591f0e2cb844c2323/sivusafan.pdfIn PDF document text
    • https://ssvacancy.com/ckfinder/userfiles/files/25861291889.pdfIn PDF document text
    • https://churchboys.org/userfiles/files/woxigozunatidumezisebune.pdfIn PDF document text
    • https://hotelexpert.ro/uploads/files/lazusapulejidi.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/48863632059.pdfIn PDF document text
    • https://patriot.ch/wp-content/plugins/super-forms/uploads/php/files/v1t78cbvrppj1fqe6gm46s3v7p/dakopepepabigerokogubotev.pdfIn PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16077881385f14---lazeguwomekisijak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=aristocracy+government+definitionPDF 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_off00010c51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C51 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12468 10936 bytes
SHA-256: 7f8f1d5f317de0dd529cab26c92c1efe82e86cdcfab7b1004759e5f8564ffae1
font_02_sfnt_off00013da4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DA4 18632 bytes
SHA-256: a62b837d7b7d4d3143d0a6733e56ecbc221c06a0182e1b094ff1a8d2f07fa470