Malicious PDF — malware analysis report

Static analysis result for SHA-256 c752eb382546b548…

MALICIOUS

PDF

95.4 KB Created: 2021-08-22 05:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: ad7a4ea2117382f4a5a8b55587903bf0 SHA-1: 7787bdcb47bed5a160b93e8eb7fee1f3a05b3042 SHA-256: c752eb382546b5480e47bf62724eebfb96650675fdcec73d980b8df24ec8ba25
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed for malicious redirection. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://1night2day.com/UserFiles/file/navaliraxaxoruj.pdf In PDF document text
    • http://bluecars.pl/userfiles/file/raxizelatobobalazanale.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160f85ce4ec9f0---mubokevez.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/jokuporenesivesawageme.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082e6cd3c7b9---gawexipemofosejarejofo.pdfIn PDF document text
    • http://artwatch.ru/userfiles/file/67212445007.pdfIn PDF document text
    • https://wavesmaroochydore.com/wp-content/plugins/super-forms/uploads/php/files/fe3qngh6cqv4tisruejpc3u26q/wedajekadujiketek.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090705c6dc53---nenizofe.pdfIn PDF document text
    • https://subarini.ro/mm/file/70966802112.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/21049765337.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/35775101839.pdfIn PDF document text
    • https://norservis.com/files/files/68377291195.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160906c3ca3f4e---45346501284.pdfIn PDF document text
    • http://ersatzmonitor.de/userfiles/file/melorozulum.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/rtf1jnfrf7ucv8cgf19dnaifdd/nelazedomeli.pdfIn PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a117750a037---17874019520.pdfIn PDF document text
    • http://usmleworkout.com/files/file/9156618853.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081a1a77017d---woravax.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/ae24fc7443be0dda64fe0a8a06d14a3a/52552556138.pdfIn PDF document text
    • https://imagebeaute.fr/userfiles/file/duzutijebewud.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16075399a79e8c---zidegafixefadesukitutema.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/64973894556.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=advanced+dungeons+and+dragons+book+of+artifactsPDF 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_off00010ef5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF5 10984 bytes
SHA-256: ef3c5c5a42be2a87b4c1133907e93628c5d28fc30240f906a0234e1181145d11
font_01_sfnt_off0001287e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14090 17840 bytes
SHA-256: 7c54fd6a6a5089b70b2101a1fc9485fa5e158671bbc92500541a3d1a1d26a60a

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