Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9cdaeb2851abc2…

MALICIOUS

PDF

76.5 KB Created: 2021-09-05 06:32:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: ecb81c0b2959214222cd20113216e008 SHA-1: ca34bd1c1a1907c9a28530acd7698f30f43a14cf SHA-256: 6b9cdaeb2851abc235147df040a4cda65415c0d21c37451ce63acd36bd7dbd7d
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 disposable hosting or compromised CMS upload directories, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the heuristic firings and URL analysis are sufficient to determine the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://hzdshg.com/images/upload/File/96235287861.pdf In PDF document text
    • http://burchiellati.com/file_fck/file/xutufabaderiwotigotapep.pdfIn PDF document text
    • http://moyamoya.center/images/hand_uploaded/files/zekapiro.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160781a5893905---xagubuvuboxolij.pdfIn PDF document text
    • http://reelproductionshd.com/userfiles/file/gasodenomotukamujakigu.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/c235012220cdabd84caa71570b88fa18/5598124915.pdfIn PDF document text
    • http://criollo-cocoa.com/userfiles/file/davulesofajirapoxo.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ff12a5f4c---37978770044.pdfIn PDF document text
    • http://www.predoisiasociatii.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c30fea848c5---metosos.pdfIn PDF document text
    • http://sibmaxi.ru/userfiles/file/12958990325.pdfIn PDF document text
    • http://tafgambiatours.com/userfiles/file/92278038281.pdfIn PDF document text
    • http://hanasushimenifee.com/uploads/files/gogajepebujubunabizeno.pdfIn PDF document text
    • http://vivaibonomo.it/userfiles/files/14505882596.pdfIn PDF document text
    • https://devcons.org/uploads/userfiles/files/ribovitik.pdfIn PDF document text
    • https://travelselection.us/wp-content/plugins/formcraft/file-upload/server/content/files/1607852b2845d8---35701762593.pdfIn PDF document text
    • http://www.bewegeninarnhem.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161095fd4d3c80---11158230227.pdfIn PDF document text
    • http://josephlillianmorrisfamily.com/clients/59960/File/58718761260.pdfIn PDF document text
    • https://utilitydiscount.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bb5f2316dc---18850188806.pdfIn PDF document text
    • http://payassistinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b8f5351305---83510680963.pdfIn PDF document text
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/zodatefiwewibomar.pdfIn PDF document text
    • https://leesman.com/wp-content/plugins/super-forms/uploads/php/files/00a97ed9bb2a8f0e1d123b9c7cea2f19/mudimobubaxaza.pdfIn PDF document text
    • http://studiomalpocher.it/userfiles/files/4420972166.pdfIn PDF document text
    • http://womenshealthcarenp.com/clients/2/29/29a32d4da59f0b4eaa4573e1354aeabc/File/79681045437.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=baixar+editor+pdf+freePDF 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_off0000c86c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC86C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e083.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE083 10328 bytes
SHA-256: 414b7d678cdab7cc961b2e8b6d2ccce2b9ad5fc26fa643c91221dc9f82645db9
font_02_sfnt_off0000f7eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7EB 17304 bytes
SHA-256: 591679afe145800371d1b8d51806d9b7d34837b332f80663f226ded0f091fef4

Open this report in the interactive analyzer, or submit your own file for analysis.