Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea4566657813ed89…

MALICIOUS

PDF

113.9 KB Created: 2021-07-18 10:17:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: ac9f62f8569e806f1b083f4572fa2d35 SHA-1: f51844c5da5439813b239e5b35a20f42f9c06fe4 SHA-256: ea4566657813ed896b0967ef568bb36f4c5077aaf50ed5d5c735a07db85dcb60
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as 'Pdf.Phishing.Trojan' and flagged by an ML classifier, indicating malicious intent. It contains a link farm pointing to multiple compromised WordPress sites and other domains, suggesting it's used to redirect users to malicious content. The PDF structure and heuristic firings strongly suggest it's part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/43fc29e7991b767fafa915960311111b/31139248589.pdf In PDF document text
    • http://karinameal.com/imgdish/files/tevimovor.pdfIn PDF document text
    • http://www.gainerwindows.ca/wp-content/plugins/super-forms/uploads/php/files/pb76dgbq5ud2cbf3pcqv3ujr41/41990860267.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160948b9240213---morulutunat.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090f7b933fd0---97575313221.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a4a24ab80c1---durovenibofiw.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/visav.pdfIn PDF document text
    • http://gorisum.net/fckeditor/upload_file/file/zevoduzotuliw.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/54e83fbaece980c98ac1f2cec802a2cc/rogenapimugufoni.pdfIn PDF document text
    • http://www.yoko-ono.be/images/userfiles/file/90064589664.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7a87aaef---71238788612.pdfIn PDF document text
    • http://hiro-seiko.com/upload/files/gifudepevarokageju.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/r3t7ae7dd2di38s8hbnm6jvo47/22447783120.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160740ede98088---gebegadom.pdfIn PDF document text
    • http://kiiga.ru/userfiles/file/97178642619.pdfIn PDF document text
    • https://pingthye.com/userfiles/files/28870290317.pdfIn PDF document text
    • http://jjmcp.jp/userfiles/Image/file/96517263196.pdfIn PDF document text
    • http://aaaexpressheating.com/userfiles/file/fuxari.pdfIn PDF document text
    • https://widepolymers.com/userfiles/file/41036120191.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160cfdea48c68e---dokiwawim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=altar+of+sacrifice+in+the+tabernaclePDF 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_off00015bcd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BCD 10556 bytes
SHA-256: 59773ab2f743b3a4f45492633126a2d02d068af01085a9947c6cc92ac055a53e
font_01_sfnt_off000173d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x173D8 18340 bytes
SHA-256: 163718cbe2f13b6814f4bb5e1eb3705c36092b0938b51326405d4d37007d5823
font_02_sfnt_off0001a296.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A296 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1