Malicious PDF — malware analysis report

Static analysis result for SHA-256 325989329b0b54e5…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 08:53:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfa8987300d37e90d4708510bf84a48f SHA-1: 5fd880fdee0e81eeeeef88ba08ab37f8803a8462 SHA-256: 325989329b0b54e5af931ce28449b9c4b1b5b3dcc049776f632ef2d06ff02b8a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites or disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=movie+fx+photo+editor PDF link annotation
    • http://zopos.zohukum.com/ckfinder/userfiles/files/5813640444.pdfIn PDF document text
    • http://yingtailong.com/upload/file/21091210364895854893cnd0ue0lic.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136930d7e277---89168438256.pdfIn PDF document text
    • https://drishtinetcom.in/FCKeditor/file/jinelera.pdfIn PDF document text
    • http://mdknoodles.co/uploads/files/70952388143.pdfIn PDF document text
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b913950721---52292831915.pdfIn PDF document text
    • http://faisaltowel.com/survey/userfiles/files/15102355821.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/82100715371.pdfIn PDF document text
    • http://fge-service.com/userfiles/file/33196835341.pdfIn PDF document text
    • https://semagro-msw.ru/pics/images/file/56778914856.pdfIn PDF document text
    • https://tekartltd.com/upload/files/lonuminebosigujobelo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612eddc8d7e84---37392521437.pdfIn PDF document text
    • http://plise.org/userfiles/file/ripoz.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fb6bc9e529---verijafunitef.pdfIn PDF document text
    • http://nhatngungoisaoxanh.com/upload/files/dijepibuvewovogeweto.pdfIn PDF document text
    • http://www.s-prom.si/fileupload/file/31303873385.pdfIn PDF document text
    • http://koddous.com/userfiles/file/57210994406.pdfIn PDF document text
    • http://restaurant-lyons.fr/userfiles/file/fewesakupoti.pdfIn PDF document text
    • http://metalzilemboeventi.com/userfiles/files/xifagexe.pdfIn PDF document text
    • https://massagetheory.ca/wp-content/plugins/super-forms/uploads/php/files/46c3450442daf2732774acc0703f037b/52348176512.pdfIn PDF document text
    • http://ateliergermain.net/sites/default/files/file/48283467327.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/h707nq4v902centt5p29pslo98/80703711581.pdfIn PDF document text
    • http://vegman-kzn.com/ckfinder/userfiles/files/84914407228.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_off0000d6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6F6 10276 bytes
SHA-256: 212d2c73a9567743427f3b5a449811d248704af22f9798c68edd0187787742cd
font_01_sfnt_off0000ee3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001064c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1064C 18516 bytes
SHA-256: ee2e2c3d30b8d2de77f13f6f5672321bd987fbcd9e482a13d70a74e802838b2a

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