Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f15a51bf50da7a4…

MALICIOUS

PDF

81.3 KB Created: 2021-07-07 22:54:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9191cc9e2752fd505da84bf81595186a SHA-1: 86feba0139e2a79ca49717c5f3f601dbea57aa37 SHA-256: 3f15a51bf50da7a4320182c2721986e2d21b5211e457bbe6923885da7d6f8a4f
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous URLs pointing to compromised WordPress installations and other disposable hosting. These links likely lead to phishing pages or further malware downloads, indicating a malicious intent to lure users to unsafe destinations.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://infrive.ru/uplcv?utm_term=language+of+composition+3rd+edition+pdf PDF link annotation
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0ff28b53890c1ddb14076280282f54c2/97691167543.pdfIn PDF document text
    • http://nuitsdartistes.eu/images/file/77213046867.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c5dabc6b04c---96548953508.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/408fc9538334625c305fb89a28b6a8a0/lepilepekevikexogowumasa.pdfIn PDF document text
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/feleselatu.pdfIn PDF document text
    • http://www.immiflex.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be4477f2067---34157426226.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/16088e206e6a45---bupumep.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16095fefe202e6---22617079047.pdfIn PDF document text
    • https://marljivo.hr/UserFiles/files/melewut.pdfIn PDF document text
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/jumisa.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/15991713932.pdfIn PDF document text
    • http://amon-syotengai.com/userfiles/file/kigitej.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c4fb92e17e6---92767739620.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/8b587fc6209facc0caf4ee7ac23c608f/genopamizumin.pdfIn PDF document text
    • http://campbellelectronics.com/uploads/21431989598.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e49c1c171f---20009902008.pdfIn PDF document text
    • https://myupfield.link/wp-content/plugins/super-forms/uploads/php/files/97lrcs4rkns9bpc3gnq661o9k1/503536312.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/2478781638.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160930cbbf1a34---75535121013.pdfIn PDF document text
    • http://www.opencalgary.org/wp-content/plugins/formcraft/file-upload/server/content/files/160cfe3638a831---3318810480.pdfIn PDF document text
    • https://metroguards.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16094495632a6c---jekomefip.pdfIn PDF document text
    • http://beijingbeat.com/contents//files/vuxaxumixaxakiniw.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b306f4d5969---ninoladenexeje.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_off0000d759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD759 11144 bytes
SHA-256: d1769d387eb13837b3bf6c3130244db3d5ab5c6aaa21ce79cb9536c5f5fe0654
font_01_sfnt_off0000f132.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF132 17744 bytes
SHA-256: a9d0567616bb1a0ee15cb49d351e20489a3f624f9b8fb17e3fff1e1456195859
font_02_sfnt_off00011fc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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