Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef6a04d83be275d…

MALICIOUS

PDF

88.5 KB Created: 2021-07-22 20:10:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c14a040de74f95d20d385ff64ad34d32 SHA-1: 609aa859ea3d6815115837592651733be51e7254 SHA-256: fef6a04d83be275d19cee4ec5ff009381670b30ff609dfe681c481059a5357f7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Several URLs point to compromised CMS uploads and disposable hosting, suggesting an attempt to distribute malicious content or conduct phishing. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://sl1971.com/clients/5/51/517263f0417f9379c67e6eba0e0bdfe8/File/30917667749.pdf In PDF document text
    • http://kompletucetnictvi.cz/files/file/32281982375.pdfIn PDF document text
    • http://slesnick.net/userfiles/files/xurog.pdfIn PDF document text
    • http://momsystem.ru/public/file/43156508653.pdfIn PDF document text
    • https://ecotranslation.ca/upload/editor/file/linovuxivujan.pdfIn PDF document text
    • https://fullhousetourism.com/UploadFiles/file/20210616141358108.pdfIn PDF document text
    • http://cphs1970.net/clients/877309/File/81100926884.pdfIn PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/7b8bfb4a926ccf2664856194f1d19160/66209729169.pdfIn PDF document text
    • http://parkwaywest1974.com/clients/861606/File/54407697258.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/95714882077.pdfIn PDF document text
    • http://apexnepaltravel.com/userfiles/file/nezujowedarefadogusi.pdfIn PDF document text
    • https://bataretak.com/img/files/file/baxitisa.pdfIn PDF document text
    • http://tutaylamhet.com/storage/ckfinder/files/gigodotujagemevul.pdfIn PDF document text
    • http://compsult.net/userfiles/file/tikawufakogak.pdfIn PDF document text
    • https://sgdivorcelawyers.com/wp-content/plugins/super-forms/uploads/php/files/e75d57a53ee36a4395a14b95178f79a2/74463805176.pdfIn PDF document text
    • https://nationalcardsolutions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160898e4175229---23241685966.pdfIn PDF document text
    • http://imssp.by/data/images/fxeditor/file/kaxoxirevifalegufajerapi.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/70706135731.pdfIn PDF document text
    • https://www.napariverinn.com/wp-content/plugins/super-forms/uploads/php/files/108c11bbfa9a07d176a42c8b0e924545/53185708583.pdfIn PDF document text
    • https://cplastik.cz/data/cms/file/74121740817.pdfIn PDF document text
    • http://www.suffaheducation.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608a0a5d25f45---vakimof.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/16071049e92f17---51416083446.pdfIn PDF document text
    • http://chuaphucluong.com/uploads/image/files/jokaxiritalapefe.pdfIn PDF document text
    • https://sipare.com.ar/wp-content/plugins/super-forms/uploads/php/files/89d8lni7md15rdrk1s151b0gh4/sedagobuxoxateril.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=herbivores+meaning+in+tamilPDF 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_off0000f5d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5D1 10648 bytes
SHA-256: f966e27ed14a3300fbb757fef5b33f2d542a5c2b96e1f364fcefc4818345cb13
font_01_sfnt_off00010e32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E32 17656 bytes
SHA-256: 38fc1963c4ef2c573c1ea2eedbbb8b3f80f944be18896fa1edaa989ab1f0c132
font_02_sfnt_off00013bb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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