Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6bf2586ffa32800…

MALICIOUS

PDF

74.5 KB Created: 2021-09-23 04:27:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0a55b41af0e7804257e17125a69c2e32 SHA-1: 29f4675e511e5c929f241a9980deea3801a3d585 SHA-256: a6bf2586ffa32800ee400ced9b774bf6fa5ccfb50753d2cebb2b490b216d186d
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Numerous heuristics point to the PDF being a link farm, with many external URLs hosted on potentially compromised or disposable domains. The presence of these links suggests the document is designed to lure users to external sites, which is a common tactic for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://archism.ru/uplcv?utm_term=mould+king+almubot+app PDF link annotation
    • http://receptlap.hu/files/83677215848.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/zikikupudaxirub.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/58e761a577170aa1d35e689fc56ba681/41429553889.pdfIn PDF document text
    • http://sbkf.org/files/files/wubabumira.pdfIn PDF document text
    • http://pc580.cn/upload_fck/file/2021-9-4/20210904124946561542.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161468144c2ebb---68824192406.pdfIn PDF document text
    • https://fultoys.com/userfiles/92446329437.pdfIn PDF document text
    • https://villatoscana-pi.it/userfiles/file/bexajoradunajigosofamo.pdfIn PDF document text
    • https://rugsinc.in/UserFiles/files/1212096440.pdfIn PDF document text
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ecdcb985ba6983cf99d865350d5fc3c/sizesimogu.pdfIn PDF document text
    • http://cn-junsheng.com/upload/file///202191101115871.pdfIn PDF document text
    • http://werkschoenenverkoop.nl/images/docman/files/wijetavenikodepaduge.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/nososikitizi.pdfIn PDF document text
    • http://poketomecam.com/uploads/files/pesafediwej.pdfIn PDF document text
    • http://equipociclistaugeraga.com/ciclistas/userfiles/file/tadopinodopovaneluxofita.pdfIn PDF document text
    • http://votava2.altrodesign.eu/ckfinder/userfiles/files/10525575601.pdfIn PDF document text
    • http://ncdesign.it/userfiles/files/basubozubixemewaru.pdfIn PDF document text
    • http://laptopcuhaiphong.vn/upload/files/desojijixowodasub.pdfIn PDF document text
    • http://www.beverburcht.nl/upload/files/liwazali.pdfIn PDF document text
    • http://theexplorerthai.com/userfiles/files/vibetululofakalur.pdfIn PDF document text
    • http://trevorhannant.com/zekukuwevopo.pdfIn PDF document text
    • http://abwninemile.com/uploads/files/navupujerajemu.pdfIn PDF document text
    • https://tainandentist.com/uploads/files/202109011044123701.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16130cd26580e0---32449809694.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_off0000bfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFE5 17236 bytes
SHA-256: b0594790406ec47ed7132d9384276fedce669ad5193fbf007b2dfb5492cd6373
font_01_sfnt_off0000ec89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000104a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104A0 10660 bytes
SHA-256: b616961b024ba3f4e57982778539b21ecf15bfe645c17a14d82bbbacad64cce8

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