Malicious PDF — malware analysis report

Static analysis result for SHA-256 c11edfe204ba9d0a…

MALICIOUS

PDF

71.8 KB Created: 2021-09-16 12:01:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 62bbf0d5c5d4b1918f99c7509759d66b SHA-1: 716a740c3b881a6e30cbb6af4138c60066b149d1 SHA-256: c11edfe204ba9d0aed9776f86203c383a0865a3af0c0e09058299299e0902700
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites, including those hosted on disposable domains and WordPress upload storage. The presence of numerous unknown URLs suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://markiza-trade.ru/admin/ckfinder/userfiles/files/65522618111.pdf In PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe4b9efe42---11353241700.pdfIn PDF document text
    • https://gencshoworganizasyon.com/upload/ckfinder/files/virumolanol.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/161403e3317972---torak.pdfIn PDF document text
    • http://mellorymotors.ru/admin/ckfinder/userfiles/files/wufibugugezuzunux.pdfIn PDF document text
    • http://topflexsports.com/uploads/vatuwesogoxepomazopeti.pdfIn PDF document text
    • http://anais.terminarz.online/kosmetyczka/krakow/files/4497603348.pdfIn PDF document text
    • http://bannhuaduong.net/upload/files/64654072587.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142a4f2964e3---19692026748.pdfIn PDF document text
    • http://stellar.ru/ckfinder/userfiles/files/pewevupavubaxowipezoxo.pdfIn PDF document text
    • http://iknow.pl/files/file/werekinekofa.pdfIn PDF document text
    • http://pscemetery.com/userfiles/file/lobumomapoboluzu.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/39478816699.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109130621023846.pdfIn PDF document text
    • http://elistaprezentow.pl/userfiles/file/98625846978.pdfIn PDF document text
    • https://www.advids.io/wp-content/plugins/formcraft/file-upload/server/content/files/1613e7b05bef14---13344983614.pdfIn PDF document text
    • http://www.expertnutritionadvisor.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613926b295865---87340815396.pdfIn PDF document text
    • http://fogathajtohirek.hu/fckfiles/file/69096996301.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5c753ca42---28353102759.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/zusetodibexogafeteterupeb.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/78890433122.pdfIn PDF document text
    • https://futuresbuilder.net/dayafter/uploadimages/newsimages/file/kizewugoxazafubekeno.pdfIn PDF document text
    • https://coherence.cz/userfiles/file/wexogekisob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=the+greatest+showman+film+streamingPDF 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_off0000b4d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4D8 17212 bytes
SHA-256: a64954804b75c3bb05ba8e141829409b3c4e0854bb95cde707e0c25bb2662678
font_01_sfnt_off0000e168.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE168 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f97f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97F 10708 bytes
SHA-256: a288cd72b99ec2cd8d189e35755fd8bde75f7b769d994257391cc958e499c450