Malicious PDF — malware analysis report

Static analysis result for SHA-256 9687f75b1ab8e133…

MALICIOUS

PDF

70.5 KB Created: 2021-09-22 09:31:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 79f23fff56dd759d92a6156d5d107934 SHA-1: 427af0d79c70447173414a486a687077a4931e7a SHA-256: 9687f75b1ab8e13337b7f4a65f00fa119c012b928cb392f4a4c11d875d78fddd
156 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure and embedded links are consistent with a spearphishing attachment used to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://medvor.ru/uplcv?utm_term=reverse+power+rule+integration PDF link annotation
    • http://ogledalata.bg/uploads/pages/files/76824310870.pdfIn PDF document text
    • http://aromaonly1.com/yamituki-n/uploads/files/36615884366.pdfIn PDF document text
    • http://gzperson.com/uploadfile/files/kusunanufobijukamuri.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/94869628321.pdfIn PDF document text
    • http://saigonford3s.com/uploads/2021-09-12/images/files/meguboju.pdfIn PDF document text
    • https://jhservice.net/imagenes/galeria/files/gofevisezi.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe44be0ae---wusebepopiru.pdfIn PDF document text
    • https://yifff.se/userfiles/file/muwogefileluliwedotupubep.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/1613a485b31539---67803108828.pdfIn PDF document text
    • http://franklcalabreseattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/monuwusijusoluti.pdfIn PDF document text
    • https://prawobrzeze.info/userfiles/file/39887468852.pdfIn PDF document text
    • http://www.klccpa.com/userfiles/file/In PDF document text
    • http://botaierpharm.com/upload/files/xunejij.pdfIn PDF document text
    • http://yogo110.com/userfiles/file/lukone.pdfIn PDF document text
    • http://tlca.com/Content/uploads/files/56867231531.pdfIn PDF document text
    • http://fujieshubao.com/zk/UploadFile/file/2021091311093273499.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/23761530719.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/62556832848.pdfIn PDF document text
    • http://coimbrasoftware.hu/images/uploads/files/gajuvinagotudebakuso.pdfIn PDF document text
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/aec860e54baa6e13e2da47353871f58f/86185445212.pdfIn PDF document text
    • http://citygclub.com/ckupload/files/73851553048.pdfIn PDF document text
    • https://kamber.dk/wp-content/plugins/super-forms/uploads/php/files/a2dfdd728586d627a5dd77ede2fd6976/10567148436.pdfIn PDF document text
    • https://tractorpulling-emmeloord.nl/upload/file/52970202712.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_off0000b468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB468 15432 bytes
SHA-256: 830eba822719318ee0842401bdf73079839517463871f4821c4984c4467d78dc
font_01_sfnt_off0000db3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB3B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f352.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF352 10724 bytes
SHA-256: 2a306fcd3327f68e8f83c6227695199f597eb908c48cbfa439f8e07c9d5ef7f4

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