Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc292b4c6e27ce45…

MALICIOUS

PDF

105.7 KB Created: 2021-08-03 06:46:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e5e52df34157445d2483bc48f09cc394 SHA-1: f13d94da48a99430091ebb7764d202226efd3faf SHA-256: dc292b4c6e27ce452218bd66124fc44301d5d78bc96136a0b2b7fe00bc267407
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high probability of malicious intent. The PDF contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and a link farm strategy points towards an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://divinenine.net/userfiles/file/71481391926.pdf In PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/59976af72add0ed5b31ee0d2a8ee0234/25124990020.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/43230389097.pdfIn PDF document text
    • http://freetourscadiz.com//ckfinder/userfiles/files/zisamaxopofatipukuz.pdfIn PDF document text
    • https://simovi.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160c6b002f2664---zejepozasilite.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/cc8da5acd680a0895338ee7eca2ea1b2/9382743772.pdfIn PDF document text
    • http://archgeo-leszno.pl/uploads/userfiles/files/reluvatemagidon.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/gezofekupawa.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/fcf48079b162b3b7bd7dab46ce547a7a/94631526669.pdfIn PDF document text
    • http://luxe-pools.fr/i/File/58914561129.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/kexekotusowegef.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/16084f864410bf---33219238408.pdfIn PDF document text
    • https://t4g.nasscomfoundation.org/wp-content/plugins/super-forms/uploads/php/files/77t08sknvgrb91h63su9jr9nk2/jagoziwumapolotajavoni.pdfIn PDF document text
    • http://extrastyle.ee/ckfinder/userfiles/files/datemixubigafuvagalorot.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/418dbdcc04b56bab2f8ba414f2187f35/wujotoros.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/85587867493.pdfIn PDF document text
    • https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608a59ac50b92---teviji.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/fegesetusorux.pdfIn PDF document text
    • https://slide-bearing.com/d/files/54671428743.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/ef8e8079ce0bc3e42440336147155541/wutitedikawazega.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f06ba41d5d2---nidaxudelugebadepefebemu.pdfIn PDF document text
    • http://decamiones.com/userfiles/file/69139595689.pdfIn PDF document text
    • http://elyriacatholic1970.com/clients/7/79/79c6984f8945646ae1b55d50a6b4dbab/File/98652456275.pdfIn PDF document text
    • http://meruzhankhachatryan.com/app/webroot/files/file/81136170150.pdfIn PDF document text
    • https://fanaf.com/article_ressources/file/75040595791.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=fundamentals+of+engineering+numerical+analysis+solution+manualPDF 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_off000134d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134D9 11008 bytes
SHA-256: 11aa3c3289ffcfa5d9c89dc241741dcb0c4526c4d9528c819115e9b44af6f2b3
font_01_sfnt_off00014e40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E40 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00016652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16652 18540 bytes
SHA-256: 023c2b999a3319567e357ed31ed3533f68e5b21473dd0bdd8142315ff78ffb1e

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