Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ff12e2dedd15e19…

MALICIOUS

PDF

87.6 KB Created: 2021-07-28 10:28:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 06b36e2b463cc4784039a8b78ed2ef39 SHA-1: 14d153ebaf5d22717607ff95f9e2289433a686f5 SHA-256: 3ff12e2dedd15e190bdfa8d854becafc4904061e48f0d4afdcd5c6bef63142e6
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and link farm heuristics point towards exploitation of PDF vulnerabilities or social engineering to lead users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://atolab.it/wp-content/plugins/super-forms/uploads/php/files/8f6c07ab8ea206dd3841f34582b06a64/bamalekiwuwojobewimanabi.pdf In PDF document text
    • http://arlington65.org/clients/880802/File/mowovodosobiz.pdfIn PDF document text
    • http://ventss.ru/userfiles/files/11052278108.pdfIn PDF document text
    • https://istanbulbalbir.com/upload/ckfinder/files/zufajiveputogivutu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab3892c11b9---53871113549.pdfIn PDF document text
    • http://koppeika.ru/userfiles/file/jifawawuropodumuwuvusubul.pdfIn PDF document text
    • http://gulfcoolcontracting.com/uploads/userfiles/file/file/wumutufodawegobimobid.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16095d24f5c142---6088696246.pdfIn PDF document text
    • https://camping-du-lac-dijon.com/fichiers/50138726541.pdfIn PDF document text
    • http://sanmargholidays.com/ckfinder/userfiles/files/85142802952.pdfIn PDF document text
    • http://tokyoto.pl/UserFiles/file/tiwevanafexubetizurefure.pdfIn PDF document text
    • https://plswa.com/wp-content/plugins/super-forms/uploads/php/files/6987971ce9c8b0407deab144fb413acc/furopo.pdfIn PDF document text
    • https://tanasiri.com/piceditor/file/72817724588.pdfIn PDF document text
    • http://escolacaritas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a911d52701b---jijuzelejonibepe.pdfIn PDF document text
    • http://timebymtm.com/upload/files/30980005668.pdfIn PDF document text
    • https://amgaa.org/temp//files/29323779327.pdfIn PDF document text
    • http://eperon-kochersberg.com/img_db/xigefikoxofifu.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/74fbd4e70313fd1044b5eea9348f85b1/78011892786.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160c0b8010656a---genibarulapigijetebelo.pdfIn PDF document text
    • https://o-dance.com/upload/files/gakexumevegatodupe.pdfIn PDF document text
    • http://thefjordbaklawfirm.com/clients/876731/File/reforokam.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/fijipigolid.pdfIn PDF document text
    • http://eska-lift.ru/userfiles/file/rifinisumeruz.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/bafevogesanivotewalusazo.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609db1e46236f---6198421576.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=chennai+express+full+movie+hd+1080p+watch+onlinePDF 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_off0000eeaf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEAF 17148 bytes
SHA-256: 54da871ae2b1c1104db05ee1d1029e818e2955704745d81bfda0a2bc77fb48b4
font_01_sfnt_off00011b8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B8C 11652 bytes
SHA-256: 61f43ae441f9d6196fc7f4e268356947fdce0078cf84e4792daee1d3ad759662
font_02_sfnt_off0001373a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1373A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1