Malicious PDF — malware analysis report

Static analysis result for SHA-256 23e5f56b4649b2ff…

MALICIOUS

PDF

86.0 KB Created: 2021-08-07 21:11:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6840fd967a82d5ab0cfc7598fb47158e SHA-1: 03cd8b7d6e09258ce8b3f237d8ceebddbfcb4e99 SHA-256: 23e5f56b4649b2ff59d424b3e24ac2fa6fa8b60bbc449458c9b91c3d5ac59806
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure the true destination. While no scripts were explicitly extracted, the presence of multiple PDF-specific heuristics related to URI and link farms suggests an attempt to redirect the user to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://strandedtattoo.com/file/xezilisabolirikapabujix.pdf In PDF document text
    • https://atlastoursntravels.com/userfiles/file/28044548639.pdfIn PDF document text
    • http://maidnheaven.com/wp-content/plugins/formcraft/file-upload/server/content/files/16074a6b4c0751---8613347202.pdfIn PDF document text
    • http://www.awakohchang.com/image/upload/File/edegasejapenedonumel.pdfIn PDF document text
    • https://www.americanapi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf88fd61421---58113050101.pdfIn PDF document text
    • https://shiokerbau1.com/contents//files/zuzizozalewedewarazatab.pdfIn PDF document text
    • http://kurier48.pl/files/userfiles/file/7322858057.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c977aaa2988---zesikobujoxav.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/evnoi1ticn9intftqhtlq1h074/zuroluk.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/94402313457.pdfIn PDF document text
    • http://rideco.hu/upload/file/53019325066.pdfIn PDF document text
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609469084d8d8---39552742198.pdfIn PDF document text
    • https://cafesca.com/ckfinder/userfiles/files/babazaridamo.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/016fd5337993f61728e789537170b6d9/55452945797.pdfIn PDF document text
    • https://riverasphotovideo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089d4a88f620---gozuxaxebose.pdfIn PDF document text
    • http://coinproject.com/userfiles/image/file/sukefitilowapa.pdfIn PDF document text
    • https://gresathouse.com/wp-content/plugins/super-forms/uploads/php/files/a535ef868054af66456fcd8e305ca379/77875617348.pdfIn PDF document text
    • http://gursakaryahukuk.com/images/file/xivadavukivanoreterabo.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/ffnlougfav5tc5nq9f20uak9qi/13568927798.pdfIn PDF document text
    • http://thebrownbag.vn/upload/files/2949138279.pdfIn PDF document text
    • http://eventechsite.com/files/files/lejesusavenifigeb.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/30006985334.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/0a53903e5ce57173472617dc0eb0e1ed/67545322258.pdfIn PDF document text
    • http://bukhatirhomes.com/userfiles/file/vogawogazolivofoz.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/jiripelelogax.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+do+solar+panels+work+pdfPDF 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://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_off0000f155.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF155 10468 bytes
SHA-256: 6addf0ebb4b40a94808fd394178c452c0213de324dac45ae61c399996ed9cf67
font_01_sfnt_off00010939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10939 17272 bytes
SHA-256: adfde0def979e19f3bf7afd558ce0c54896cb26e96671cdcfa327cae6d526ba1
font_02_sfnt_off00013668.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13668 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1