Malicious PDF — malware analysis report

Static analysis result for SHA-256 93ace8b73b7b58b8…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 21:01:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0673ce1dfd423f7c03e8cc66a144d761 SHA-1: 594e283c98722e2815b9dc5b9c2cece39bf49340 SHA-256: 93ace8b73b7b58b8b57687fd439ae3cf47f3d8414c9a12025e7c141d81fe0a7c
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple compromised websites, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document is designed to host and distribute malicious files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://wrd13.com/force/file/83504309292.pdf
    • http://keitbg.com/images/files/gezusap.pdf
    • https://fitness-sport.it/userfiles/file/24917256090.pdf
    • http://mjengo.org/FCKeditor/editor/filemanager/connectors/php/connector.php?Command=FileUpload&Type=File&CurrentFolder=%2Ffile/zakufomipezesusujusagave.pdf
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/wefuxixoniratulon.pdf
    • https://equinox-e.com/upload/UserFiles/file/91966108561.pdf
    • http://snabsz.ru/ckfinder/userfiles/files/58693303100.pdf
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/sedelimediseve.pdf
    • http://queuemanagementsystems.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134d6056853d---zozisofuzedewosagimi.pdf
    • http://www.extramas.com/userfiles/files/13412186751.pdf
    • https://popcouncilinstitute.org/wp-content/plugins/super-forms/uploads/php/files/1e99b24e9a744009cdeeff462696b1af/47814371941.pdf
    • https://nls.vn/upload/files/8651075340.pdf
    • http://theprofitnesstrainers.com/userfiles/file/ximujenurixojosuto.pdf
    • http://fese.in/ienupdimages/images/files/23474107922.pdf
    • https://marblobath.com/app/webroot/img/files/bulibesasoxevoxagurer.pdf
    • http://civicwomen.com/ckfiles/files/zirakep.pdf
    • https://infravoip.com/wp-content/plugins/super-forms/uploads/php/files/a30c82fd9570ab9529b85a9560c1eb13/kubuzevuse.pdf
    • https://greshamgilessalon.com/wp-content/plugins/super-forms/uploads/php/files/428882b5f952f24a9901d3ee347af7a0/bajexusadusomugemesige.pdf
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/0f07737298e510b76c05e36e10e76d8c/tibuje.pdf
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/uetqafluoq3mqfi5ga3n4s969o/94450895559.pdf
    • https://kaptenhoki.info/contents/files/zirafavikeda.pdf
    • https://grupo-kayros.com/userfiles/file/bufosuvazugafasumeti.pdf
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/823fa054973945a299db23ff487f2271/25133746618.pdf
    • http://posuni.com/userfiles/file/87005348563.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=platform+tools+adb+download
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b39d.bin
96fe94be37a8670551986c112023f8105b528df006e8d66db6c0d0dd273ffff0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB39D 10516 bytes
font_01_sfnt_off0000cba1.bin
e4a03c79bfa28cdae4e4f60f2c4a5712ac96db2b4aa890880edfdc0ffc721a3c
pdf-font-stream PDF embedded font (sfnt) at offset 0xCBA1 14632 bytes
font_02_sfnt_off0000efc6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC6 16792 bytes