Malicious PDF — malware analysis report

Static analysis result for SHA-256 a04b3e1897be1a37…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 02:41:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: e4dceb464bc815aa72fcbe38098ec088 SHA-1: ccd2a19a9b1b35dc4e70cf3a20cb9dbb27ef587d SHA-256: a04b3e1897be1a37ffe62c36a1c0778e138dadf2d6827d00a659ed6f6e556bce
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 disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://inwebjor.ru/uplcv?utm_term=accept+credit+cards+on+android PDF link annotation
    • http://gyn-ordi.at/myPix/file/wotetoxakemupotunid.pdfIn PDF document text
    • http://www.tamtrebinhminh.com/public/files/dabinum.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/jowumesulubefodi.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/16144b4c0decfb---45099963232.pdfIn PDF document text
    • http://zopos.zohukum.com/ckfinder/userfiles/files/xekojejiluxufanuxunowo.pdfIn PDF document text
    • http://retailcop.ca/files/peboduma.pdfIn PDF document text
    • http://cdkuys.handysociality.com/upload/files/79119269586.pdfIn PDF document text
    • http://z-sinpro.com/upload/files/susisuvolana.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16136682ea7541---nolibibi.pdfIn PDF document text
    • https://senarathgroup.lk/assets/media/file/94756564878.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/161401c6fafd71---92165480425.pdfIn PDF document text
    • https://marcuspietrek.de/MARCUS/files/file/waresu.pdfIn PDF document text
    • http://satunatc.ac.th/ckfinder/userfiles/files/jepevovejebanorufifaru.pdfIn PDF document text
    • https://www.antoniopopolizio.it/ckfinder/userfiles/files/vebozikelaxovabafog.pdfIn PDF document text
    • http://tuttotop.com/userfiles/files/21850553857.pdfIn PDF document text
    • http://www.medical-psychology.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16145cc7f0e20d---83831518838.pdfIn PDF document text
    • http://quocteanviet.com/img-chamthi/files/39500125211.pdfIn PDF document text
    • http://shipsupply.ru/userfiles/files/fagowakemanamugipale.pdfIn PDF document text
    • https://www.sahabatkeluargahomecare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b676a5d3d5---33693110280.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/31553579808.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rapafonojuroxipafigebun.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/19176595974.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/872nccbk472t79suo1m7fv8hgd/44876529778.pdfIn PDF document text
    • http://www.its-dph.cz/admin/fckeditor/editor/userfiles/file/timono.pdfIn PDF document text
    • http://tiszaladany.hu/upload/file/zopuwew.pdfIn PDF document text
    • https://ardiinerkh.mn/uploads/userfiles/files/61814275037.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_off0000dc53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC53 17812 bytes
SHA-256: bea4f3d3aca7fecd6d5592df99f1e8f90fcc62445b349d5f29406522983cd8de
font_01_sfnt_off00010aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AA1 10444 bytes
SHA-256: 6133994eb89f06ee8609d492c24b293eae5f5547533c8d3cec2aff7c4e12d588
font_02_sfnt_off00012278.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12278 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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