Malicious PDF — malware analysis report

Static analysis result for SHA-256 0bf44765ce8e4e8d…

MALICIOUS

PDF

108.0 KB Created: 2021-09-07 20:46:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 113bcd78d61a7b4cf4d416a2dfd61a00 SHA-1: be47c046373d10c18d83781381c193a0063221ec SHA-256: 0bf44765ce8e4e8dbfd0a8a20cdb69ab455a9ba5e0b2e995ceb6129bd8ff219b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the document as a link farm on potentially untrustworthy hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://facilitymanagementassociates.com/survey/userfiles/files/75598857763.pdf In PDF document text
    • http://www.sindafaz.com.br/admin/editor/ckfinder/userfiles/files/vulomolufupefu.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/79355460875.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a721d06e1d8---dupejipev.pdfIn PDF document text
    • http://beiwendq.com//data/attachment/file/22673230853.pdfIn PDF document text
    • https://globalazeri.az/wp-content/plugins/super-forms/uploads/php/files/7rd1oookh2f3laa2g7c3koubj1/mebufegulapogumexexe.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/sujuzikilabebaxuwitexave.pdfIn PDF document text
    • http://opalbiosciences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086f77809b44---86864128855.pdfIn PDF document text
    • https://hoalavender.net/upload/files/wofoligu.pdfIn PDF document text
    • http://samilove-payitforward.com/clients/f/f9/f9b0b202ed5d2cb263a89f8a9bd08a94/File/fivigagutogigi.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/13653653431.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/m2iv6s9nq7m1f2k71bafvtvmm6/66481006660.pdfIn PDF document text
    • http://kaies.net/upfiles/2107251348388016597geiza.pdfIn PDF document text
    • https://www.azembay.com/wp-content/plugins/super-forms/uploads/php/files/ejt995814vemm2g3nsmrfuef1j/fejapo.pdfIn PDF document text
    • https://useoneconvo.com/wp-content/plugins/super-forms/uploads/php/files/6d743739510e980af6b39133d22154c6/81072675892.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16123572c91744---figuxamenujojog.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160bca11225a36---gitejaluvividopefin.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/4719556007.pdfIn PDF document text
    • http://www.combatsim.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160a43a4944e80---38027592986.pdfIn PDF document text
    • http://www.airportlimofortlauderdale.net/wp-content/plugins/formcraft/file-upload/server/content/files/160721e35d5400---10953310478.pdfIn PDF document text
    • http://szymonadamczyk.pl/uploads/fck/file/xezanota.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/49906090323.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=el+pollito+lito+cuento+pdfPDF 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_off00013ace.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13ACE 21804 bytes
SHA-256: b496f67be8f37b9e0b6230de1a40084aa95ede009ebd6ebf3b6ca0720c54c742
font_01_sfnt_off000172e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x172E5 10268 bytes
SHA-256: 25e9f894cd7415ac6b5a9400a6a1490916f9d9cd19238453bc93b13210eb9fde
font_02_sfnt_off00018a0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18A0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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