Malicious PDF — malware analysis report

Static analysis result for SHA-256 769959f371088cab…

MALICIOUS

PDF

131.9 KB Created: 2021-07-01 16:21:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-15
MD5: 3305108a2d966d078daebcc0dbbc2f4b SHA-1: 952071fda5b3b2dc083838a39c5e97e2a8b6e257 SHA-256: 769959f371088cabc1d28ccecb77ab8df31e3b9542a9d2fcaa8fa0c4d618b24b
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites. This behavior is indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9744

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://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160d859de09a58---1437121675.pdf In PDF document text
    • http://de-ko-gmbh.com/ckfinder/userfiles/files/tamosonisadoxodofewi.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160dce82b7019f---navivexevewisa.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/a7fa205e30ffad7173c04c95fa4f7fac/farasevufilatodi.pdfIn PDF document text
    • https://www.qbuildsoftware.com/wp-content/plugins/super-forms/uploads/php/files/2a35bd3fb742c9c5af6f438f0612f18e/fipukovolugujuwolive.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/u031fmf5alr297v321s3mhvenl/69260830721.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e0718c9d1---10353446096.pdfIn PDF document text
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/40m8lltdoa8jdp6ejld3caloih/86310172285.pdfIn PDF document text
    • http://uro-medical.pl/zdjecia/fotki/file/xovisizegebit.pdfIn PDF document text
    • http://katyababash.com/images/uploads/file/riwasawe.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210615_12EAE6DBA71A933C.pdfIn PDF document text
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa90084a3a1---pipurudodewuxutilara.pdfIn PDF document text
    • http://cogersquest.com/clients/f/f6/f6194b381802d71b6842d6160e8859b1/File/4215232457.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d21933876cc---vozigoxowidurokewisijox.pdfIn PDF document text
    • https://brandonsmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/oeukrq2j0njvt0li49qbq2bnu4/kinesosinurezufa.pdfIn PDF document text
    • https://neavocats.com/wp-content/plugins/super-forms/uploads/php/files/cd3abba319d380acb5d2350805b42da8/97020687794.pdfIn PDF document text
    • https://arvikabc.com/images/uploadedimages/file/valumonazazokiji.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/1327723702.pdfIn PDF document text
    • http://vipavtoufa.ru/wp-content/plugins/super-forms/uploads/php/files/461df188d20df500b48a48d6f8f46259/52293672715.pdfIn PDF document text
    • http://structurecreative.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609a32bbad1d4---2211118851.pdfIn PDF document text
    • http://heilpraxis-pankow.de/wp-content/plugins/formcraft/file-upload/server/content/files/160d7c630b2138---waveraxatokikirepoduva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=alphabets+and+their+numberPDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001546a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1546A 17812 bytes
SHA-256: a95fde841db30ffe5c97d0d44c79c32902a0df901df698080001f5c68cbc6dc8
font_01_sfnt_off00016fbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FBE 10756 bytes
SHA-256: 2db6327ebef3b373f493613e5aca2c18cd6fb976e2fbbf1292d8256327ff1741
font_02_sfnt_off0001880c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1880C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001a01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A01E 36788 bytes
SHA-256: 315e0ec260e375da9b3921085042e9b8aae62453da40f804a5a822b17a8650a7
font_04_sfnt_off0001f7ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F7ED 1668 bytes
SHA-256: 3d893f47c1d7c519aae212c817271dbfc41146d1ccb1c0f27ba3b591e70d4aea

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