Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3f42db7212dc4c1…

MALICIOUS

PDF

84.2 KB Created: 2021-07-09 00:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: babf0949e7aa568cb95c7e818f4216c1 SHA-1: ec6eed8259a87355c59007e1b51aa26cafa5ad9f SHA-256: b3f42db7212dc4c1af25b3879bcc0ad7e188f3704670ef072abdc28b56c1593c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The heuristics indicate the document functions as a link farm, directing users to multiple compromised WordPress upload locations and other potentially malicious sites. While no scripts were explicitly extracted, the nature of the link farm suggests an intent to redirect users to phishing or malware hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9930

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://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16083db752f268---sukokikizal.pdf In PDF document text
    • https://www.emmabowman.com/wp-content/plugins/super-forms/uploads/php/files/025bce5cbd6b6c9c08ca338c28ff186b/91946469507.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/58294472646.pdfIn PDF document text
    • http://jeremypourstarlight.com/clients/5/53/539822683240d2210db56c0084569a8b/File/bumovemaguguxep.pdfIn PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/27caad1145bbee17d5eaa866122b29e6/xofakoxuginajefiwam.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608477dde22b7---zurobupevameduwurub.pdfIn PDF document text
    • http://asesoriagarpe.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bad6016398---valesu.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/27221724283.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f41857948c---fajutixutubaremejebuk.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/20949631822.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160886fe544a1e---30350446248.pdfIn PDF document text
    • http://crisismobile.com/ckfinder/userfiles/files/lanonufejurevan.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/jurawumowivek.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/e7c9de27bb145bbb2c6217274aefa0d3/kefuzina.pdfIn PDF document text
    • http://alliusie.com/userfiles/file/navebogevegudarufagalenel.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e3f6d5724b8---pupigoxeligije.pdfIn PDF document text
    • http://dientrotiendathc.com/media/ftp/file/89828275490.pdfIn PDF document text
    • http://homelife-superstars.com/image/files/57565059144.pdfIn PDF document text
    • http://waberry1969.com/clients/877040/File/77866857984.pdfIn PDF document text
    • http://savannahcentury.info/clients/4/44/449a5b3489ef279447e90cf6cdd72f1c/File/58916351825.pdfIn PDF document text
    • http://bebelino.ru/userfiles/file/jowojewam.pdfIn PDF document text
    • http://a-kamen.com/userfiles/file/kivemonele.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16078f38c50a2a---nudatajonibetoregipezoseb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=2nd+standard+english+question+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 1780 bytes
SHA-256: ee6d8c25003eb2de61ee1fda640ec7b8e4605923364b71ee832b966c85f0f81c
font_02_sfnt_off0000fd66.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD66 10884 bytes
SHA-256: 06ae5d69d3d0b6a41330b7fd0526e8f31967a6c6d4950c3a46ffb68a0b742ab4
font_03_sfnt_off00011613.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11613 17092 bytes
SHA-256: 1a8bcfb62db428b027106b77d52a4e7bce8c37011398f5f741a67965b166f069

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