Malicious PDF — malware analysis report

Static analysis result for SHA-256 00af2712980d4472…

MALICIOUS

PDF

75.8 KB Created: 2021-09-17 01:05:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 441d99595f5418bb2a0c4e9b836fdb20 SHA-1: c7a81044b2db82dc44c21184f8a6b416589d9351 SHA-256: 00af2712980d4472fb31697ae9b32d0be0caad44b53143df1cb4de4e0a75e4c9
156 Risk Score

Malware Insights

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

The sample is a PDF file identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous URLs pointing to compromised WordPress sites and other disposable hosting. These links likely serve as lures for phishing attacks or to distribute further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using numerous distinct hosts with a small number of links per host, a common tactic for evading detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://queure.ru/uplcv?utm_term=atomic+size+of+na PDF link annotation
    • http://ahkkpcm.org/userfiles/pofazeritugajugopubilex.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/26997824021.pdfIn PDF document text
    • http://peter-scherer.de/userfiles/file/bupefixog.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/6de6cfb573ce6d0f84e0169aebce102b/baxivonenufarorusajut.pdfIn PDF document text
    • http://itnetworkconsultingsf.com/helpdesk/app/webroot/img/userfiles/files/58777421273.pdfIn PDF document text
    • http://zagazzo.com/userfiles/file/pilitamanowasavokawos.pdfIn PDF document text
    • https://morganmethod.com/ci/userfiles/files/mimaxerejonapavanalusufe.pdfIn PDF document text
    • http://kleinschaden-expert.de/userfiles/file/silofilinaxuweladu.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/98226366011.pdfIn PDF document text
    • http://tourhong.com/FileData/ckfinder/files/20210916_6C2C98EDA7104113.pdfIn PDF document text
    • http://cuboni.com/uploadfile/hong202109080414488222.pdfIn PDF document text
    • http://www.jindatunnel.com/up_files/file/64474278102.pdfIn PDF document text
    • http://infinijewelry.com/userfiles/file/66329791221.pdfIn PDF document text
    • https://path.mn/userfiles/files/29748222643.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134aa65c09c4---rezalu.pdfIn PDF document text
    • http://ros.by/ckfinder/userfiles/files/gaxonawutujirezig.pdfIn PDF document text
    • http://yongchengtech.com/uploads/files/202109071124349466.pdfIn PDF document text
    • http://cargologicru.com/sadm_files/86603585069.pdfIn PDF document text
    • http://erbaytag.com/resimler/files/lekemajedogil.pdfIn PDF document text
    • http://seibyou-koujien.com/files/files/vuwezexejuxogozepinipav.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136c184a9ba6---87490234257.pdfIn PDF document text
    • http://alnoorcity.com/userfiles/file/tojilixefipenuzenebe.pdfIn PDF document text
    • https://sportyou.fr/ckfinder/userfiles/files/39796707165.pdfIn PDF document text
    • http://acelybio.com/upload/files/rejademelinovezote.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16132fda069a23---90815033500.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c779.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC779 10392 bytes
SHA-256: 7ccfc1dfc6b9c129f5a01a8ab32c92f410b5865c78870bcd5d4d32196e0c6cdb
font_01_sfnt_off0000df12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF12 16636 bytes
SHA-256: 91a55754f0affe0d5a2ff8805e4fe844d3a7c0cd09fd8bcc63707f0f4bbbf709
font_02_sfnt_off000109a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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