Malicious PDF — malware analysis report

Static analysis result for SHA-256 98136390cb984ac3…

MALICIOUS

PDF

77.0 KB Created: 2021-09-03 05:28:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a137d56243e84831f02b602cd1076351 SHA-1: acdee4a0c1af5504f5959b8adc9abebe1c2a1d64 SHA-256: 98136390cb984ac322213e9faa8fd308aa810e93889e9ca5d873f7a799477e6c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised WordPress sites or disposable domains, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or serving a malicious payload. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://crysiq.ru/uplcv?utm_term=canon+powershot+elph+110+hs+instruction+manual PDF link annotation
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073d9f23ae50---53475874041.pdfIn PDF document text
    • https://isleo.com/i_photos/file/biwarobexovifizesoritinas.pdfIn PDF document text
    • http://webhenevents.com/clients/868374/File/44120130123.pdfIn PDF document text
    • http://aitrans.org/UploadFile/file/F1202105092221108799.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079f2419b296---43003304327.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/69932880964.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/venivowigifir.pdfIn PDF document text
    • http://sattamatkapatti.com/userfiles/file/75834884195.pdfIn PDF document text
    • https://szekszardportal.hu/userfiles/file/kuvuwasudivi.pdfIn PDF document text
    • http://shriadinathbank.com/uploads/43305729795.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/9468792547.pdfIn PDF document text
    • https://actaviaserica.org/board/file/files/fowosasoseded.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/nq4n33vtvff6h0htg6vqct7mhl/73330624876.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/liwixowafo.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/773d07644363e88e3e291de3ac4e0357/puwoliv.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/52815612276.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/160b49e4b0cc95---kanuvejevajiferur.pdfIn PDF document text
    • http://kopdesign.nl/userfiles/file/34355849892.pdfIn PDF document text
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606ccbdd2e5b0---82704415559.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/4647420848.pdfIn PDF document text
    • http://jfe.hk/userfiles/66661840207.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9fcc8528d1---96282572871.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ee66748e9a6---72481644774.pdfIn PDF document text
    • http://netinflux.net/userfiles/file/mugozuz.pdfIn PDF document text
    • http://trongtinpc.com/luutru/files/78049594477.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_off0000c793.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC793 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dfa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFA5 17200 bytes
SHA-256: 28d39a3e616a8c60974fbaf32ab58ab9c2602fdafadc95629d1e44e9ff5d5e91
font_02_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 11032 bytes
SHA-256: ac8e4f3f521136586f813a56ccdf58b10c4df4ef99d5a9cf5f459949fd9fdadd

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