Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfbaeeb46cec2366…

MALICIOUS

PDF

79.4 KB Created: 2021-07-05 02:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d9bb8246fc9cc9209e9bb332f392418e SHA-1: 2cfffbcb7554079a82ef7dbb96fbd9079c455946 SHA-256: bfbaeeb46cec2366a9c5bf07cc247bc61fcd92ffb9939a30e58c1f59ecb477aa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a link farm pointing to numerous URLs, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of multiple links on disposable or compromised hosting reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/nkn3ltm6uggt2qoukjakbne0m2/xakijusevixerap.pdf
    • https://hmanagement.net/userfiles/file/zipefujezepoboligufabenun.pdf
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/ae5e37dd571af60289e94c563565b740/paxivowisukijusewij.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876663179b0---paxoli.pdf
    • https://frontiersneurophotonics.org/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a8c0e488e75---19532662076.pdf
    • https://www.golddustdental.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092e44f302ca---46542990874.pdf
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/b7ae174cb354db50f2373a36b9fd8a1c/kalezovibuvemepofene.pdf
    • http://poongdung.com/FileData/ckfinder/files/20210701_E6C84F9157803C27.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/160706dba25b59---kexaruwojoja.pdf
    • http://tnslib.net/userfiles/files/1247720572.pdf
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/e961f13854ca5c79fe681a54e9c4d10c/10868242643.pdf
    • https://purpleleafestatebuyers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1026c924c1---kakonogatowosegu.pdf
    • http://msnladyboy.com/ckfinder/userfiles/files/tenefotaxotuwapozekog.pdf
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/57804e1b4a70046d89289629a3411e19/kawosulixidomavolazemawo.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1608e7703239ba---dotosuxamadegoz.pdf
    • https://argumentua.com/i/file/93391199835.pdf
    • http://hollywoodterrace.org/clients/863344/File/musilekimubevegujejo.pdf
    • https://laser123.com/geektic/files/molulem.pdf
    • http://airconbank.com/upload/fckeditor/file/negebupisaniva.pdf
    • http://www.communityheroesproject.org/wp-content/plugins/formcraft/file-upload/server/content/files/1609aacc04baee---11322911408.pdf
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e9639a9b6a---34906320868.pdf
    • http://plafondchauffant.fr//img/user/file/13964456212.pdf
    • http://keifo.ru/ckfinder/userfiles/files/8112750933.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=confederate+flag+stickers
    • 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_off0000d25d.bin
100c9cee66f8d639ea4ebf54866d874b82644126d00650a238873f26f5464dd6
pdf-font-stream PDF embedded font (sfnt) at offset 0xD25D 17332 bytes
font_01_sfnt_off0000ff8c.bin
fca07ccd88b5dbd319653b556988d51db39ae9eb170bd498bcfcebdcc1f30309
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF8C 10772 bytes
font_02_sfnt_off00011854.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11854 16792 bytes