Malicious PDF — malware analysis report

Static analysis result for SHA-256 c57092c740974ec0…

MALICIOUS

PDF

90.5 KB Created: 2021-06-27 07:25:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 61e31a11f1e2844049135f88a8637c66 SHA-1: 5931a4938ee6b0b174c189719d4ddc9c6ddff45b SHA-256: c57092c740974ec014e7a9eef00d468c8163b934802a1bd5e1eead07421b0f01
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites and disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, but the structure and URL analysis point to a malicious link distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://famecosmica.it/file/21254556701.pdf In PDF document text
    • http://elfuklid.cz/foto/Image/file/revije.pdfIn PDF document text
    • http://aucoindeshalles.com/menu/file/16951183131.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/3e987e9973afa3d425b0d0568f1b64e7/74811793581.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5a316f2ee0---76945889626.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a2dc4704ffa---4764802874.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zulotuwure.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f71c17ee5b---duwekezizuxugedob.pdfIn PDF document text
    • https://sellos-mecanicos.com/wp-content/plugins/super-forms/uploads/php/files/34d7b43bb3d505a8a40407f6adc738dc/27171880818.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/nolasonifawefet.pdfIn PDF document text
    • http://totalfinance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160bce10ed9348---18776752254.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/dazafanedixetojunaxaz.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/wamuvipeliraloludibizes.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1fb5afea6---gatikapikadasegodi.pdfIn PDF document text
    • http://monroehighbeachreunion.com/clients/8/88/88bd109b8fc96949fe6caf7698e88fda/File/35945990688.pdfIn PDF document text
    • http://gfhs1978reunion.com/clients/56625/File/48046724697.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/284efed4cf73aef3277ea9c428f81818/nutexemarezawosepok.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/lumiza.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/6b554bb8e2d0d67e7a14fcda9d5b55f3/64090807453.pdfIn PDF document text
    • https://www.kadeavenue.com/wp-content/plugins/super-forms/uploads/php/files/aafa589efcf2a589061fdd9d88f28522/3046879261.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/bagavobepiwefikoti.pdfIn PDF document text
    • http://agapetown.net/ckfinder/userfiles/files/63995183237.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/aephddc20ea0hs3fbf36okl6g2/xabuni.pdfIn PDF document text
    • https://cape-electronics.com/media/file/sovatudo.pdfIn PDF document text
    • https://nutricionintravenosa.com/wp-content/plugins/super-forms/uploads/php/files/2ace94fcd7bac9b65f3fff50de1ed915/13132575704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=gold+and+iron+orePDF 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_off0000fefc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEFC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001170e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170E 17536 bytes
SHA-256: d89a1643a6f94a6bf90d5a22beb6a9cb34e41ac85c02b4a50a4b76fb7413f29d
font_02_sfnt_off00014551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14551 10012 bytes
SHA-256: d6cdc5c2df67ee30ca3f21e151b96c3898bccb72b20d37c0ef34a10f26a663ee

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