Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9c4ff2d29476b22…

MALICIOUS

PDF

86.9 KB Created: 2021-09-01 03:30:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: f9b0aff33f582f07b97574037838de05 SHA-1: 3c69110a8a0bf0e85323330093085410dfcdc7f7 SHA-256: a9c4ff2d29476b22afa7d618288055809bd57b62d2033be6d6fb27abdae00453
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 uploads or disposable hosting, indicating a link farm designed to redirect users to potentially malicious sites. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://balarampurblock.in/ckfinder/userfiles/files/vebukelob.pdf In PDF document text
    • https://parklanehotel.asia/userfiles/file/rurusew.pdfIn PDF document text
    • http://evaemlak.com/userfiles/file///13819796549.pdfIn PDF document text
    • https://xn--pssa17sw71b.tw/upimages/files/totivudodefubuledoruninif.pdfIn PDF document text
    • http://www.viksexteriors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607bf1ba2f667---lovuxumededuwuxexida.pdfIn PDF document text
    • https://www.alarisusallc.com/wp-content/plugins/super-forms/uploads/php/files/a0a8315afedf49cb4c96737338312d8d/jalananakivurer.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/51331647823.pdfIn PDF document text
    • https://homestayhoian.vn/uploads/image/files/mubisesuzosarokub.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/709ed099306201054f34c728630cfff7/54050386543.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ad3d61374d---xisedugepedetos.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be020e1abf0---bavasekeda.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/ef73fc1b757cf528c942f4b2caef39d0/29698400456.pdfIn PDF document text
    • http://clear-es.net/yamituki-n/uploads/files/60543293109.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/4958971133.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/b458e508042c5a6d341caf507fd02efb/44182195037.pdfIn PDF document text
    • http://dinskayarealty.ru/media/file/19090791740.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cd641ed62---fufuzilogomiw.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/cbd85f2c24345311316602230a4a65d8/zudatilewafaruzapov.pdfIn PDF document text
    • http://sambometal.com/dataroom/file/lovanalakowe.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/4a97cc399c492e8c9cab6bdef4f6c967/63308387208.pdfIn PDF document text
    • http://assushop.com/userfiles/assushop.com/file/71563233132.pdfIn PDF document text
    • http://hrudolf.com/userfiles/91179839314.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16086aba8961db---koruxakadagumedot.pdfIn PDF document text
    • http://fabienneblavier.be/upload/files/25347934494.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=how+to+write+the+purpose+of+the+study+in+researchPDF 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_off0000eb41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010358.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10358 10960 bytes
SHA-256: 3d25c49c827d5f3c26f2b5fb1b936dbec9d5f94be0235339c75fd93c2aa891c4
font_02_sfnt_off00011cca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CCA 18228 bytes
SHA-256: e67e3d3a150ec4b75f47673f8231ab91cde0cb4fc37d25de697f9ad0e8dd5e56