Malicious PDF — malware analysis report

Static analysis result for SHA-256 7a29b0cc6589e596…

MALICIOUS

PDF

81.6 KB Created: 2021-09-02 08:01:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b4d00d9f3159e8e0e3b568217b6dfe13 SHA-1: f14cffca1b1d62d1fff413e616157ea142542ebe SHA-256: 7a29b0cc6589e5961a1c245c9b0d4a7b6d826fcf61c61dfaf64e0aab9def7dc1
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery through these links. No scripts were extracted, and the document body was unreadable, so the analysis relies on the URL heuristics and AV detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://seattlebestteriyaki.com/uploads/files/juvajotewadetijaro.pdf In PDF document text
    • https://www.horisunmauritius.com/wp-content/plugins/super-forms/uploads/php/files/752dfff0e795a7a0d0968cccb1816895/nekuzolalikexevugemed.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/37939593628.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160d36b75d04b3---44720716682.pdfIn PDF document text
    • https://tungafilm.com/dorceiys/ckfinder/userfiles/files/tetusujarosi.pdfIn PDF document text
    • https://www.penyembuhanholistikreiki.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f07d8f7e4bb---zubalodanu.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/zaguniwazi.pdfIn PDF document text
    • http://adaviestransportltd.com/userfiles/file/jewokita.pdfIn PDF document text
    • http://cloverdiamond.com/file/86064228746.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/taporowag.pdfIn PDF document text
    • http://mariamozharova.ru/uploads/files/60447948388.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/nusoluneluxozenagoguwuli.pdfIn PDF document text
    • http://drthchowdary.net/userfiles/file/mavojabefu.pdfIn PDF document text
    • https://comptables-publics.fr/userfiles/file/vexudagin.pdfIn PDF document text
    • https://member-amz-seller-system.de/wp-content/plugins/super-forms/uploads/php/files/ac608647a5714b3d387f6db358476edf/zonezugavi.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/0adc09acbd9ce8bda230cdadd319efb2/zivefobe.pdfIn PDF document text
    • https://pass-eco-energies.com/ckfinder/userfiles/files/xesusuvirad.pdfIn PDF document text
    • https://sandzak.best/wp-content/plugins/super-forms/uploads/php/files/7266e208f383e705868172602ee7e010/pomikovomab.pdfIn PDF document text
    • http://www.nbc.com.vn/ckfinder/userfiles/files/xineweki.pdfIn PDF document text
    • http://c-amc.com/upload/files/motedapuxejekowi.pdfIn PDF document text
    • https://kaskad-74.ru/images/uploads/44369765611.pdfIn PDF document text
    • https://aventura-agence.lu/userfiles/files/83044980237.pdfIn PDF document text
    • http://linklandhotels.com/upfile/editor/files/43798731272.pdfIn PDF document text
    • https://pet-fashion.ro/mm/file/38633889612.pdfIn PDF document text
    • http://romanasulcikova.cz/userfiles/95256755763.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=strategies+to+adapt+to+climate+changePDF 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_off0000dd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD43 11036 bytes
SHA-256: 9f553f94900ef798a2f3df5f55c81dbe104a3bac5bdecf89a06a117ff08ceba1
font_01_sfnt_off0000f67a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67A 16388 bytes
SHA-256: 1d89e7fa332e94b7841896af735712b9327becae9b372b0ebbf8ade4d98a9f9c
font_02_sfnt_off00012040.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12040 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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