Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e49d91ebe4bdc9…

MALICIOUS

PDF

95.2 KB Created: 2021-08-25 22:30:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: b2c30d84f6c5024497be71160ded75a0 SHA-1: ae1e73ec14eb82c23d3451393808d8c677bf05e8 SHA-256: b5e49d91ebe4bdc95baf076c189425a719c7edc65f454188ff73bcc63d40ba27
156 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its specific purpose beyond the presence of these links.

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 https://www.focus.mu/wp-content/plugins/super-forms/uploads/php/files/b0d35f851107888e0222856bc6d4af08/41935379050.pdf In PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607265c7e4ea7---warupujipakerakomotaxuri.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/4b42dac04f4647fa82435afb9f3f7f77/zeliramagenejoxunodi.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/d771026cc4d78b6d5e4b37b49e280481/kesakilexap.pdfIn PDF document text
    • http://vincityhomes.vn/wp-content/plugins/super-forms/uploads/php/files/l6553itsqni0rbpikmgc7lumql/90652965710.pdfIn PDF document text
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/3cca6d4fd2831a50709176c3aeeb5ae4/nupovanorokenixe.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160bbd3a170cc1---vawixa.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/xefevetake.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/4f9466b35a2fd3456ec43a267a52ead6/sosufumuxebipoxugi.pdfIn PDF document text
    • https://humble-brag.com/wp-content/plugins/super-forms/uploads/php/files/rkhkudm3gl8r0a1pfrgnpjr4q1/81028885849.pdfIn PDF document text
    • https://alusol-kw.com/ckfinder/userfiles/files/punifuw.pdfIn PDF document text
    • http://93564497.com/userfiles/95584923596.pdfIn PDF document text
    • https://people11people.gr/uploads/File/vomaxapaxoruxaligigofojez.pdfIn PDF document text
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/ek9lgudh2b4929hn0k49mv90e7/dajijog.pdfIn PDF document text
    • http://yokohama-model.com/userfiles/files/gefobefikerorad.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160782ce2a1372---zikemevowafupisosi.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f7fec8cc691---45241111007.pdfIn PDF document text
    • https://www.bouwenaaneensterkwerkgeversmerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16096475ace698---76985499598.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/lulikenixiji.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/duralelil.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16088862695703---jigimaw.pdfIn PDF document text
    • https://mkycc4.com/kycc4.com/userfiles/files/41699066275.pdfIn PDF document text
    • https://davaocarrental.com/images/file/nudirozajaboforafujegute.pdfIn PDF document text
    • http://matsusushionline.com/uploads/files/jarejidijoxedu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=good+in+patoisPDF 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_off0001104b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104B 10144 bytes
SHA-256: fb53bbbcf1c54105d87b9f3021446bfa3d2fb31a05c78317599b4cd5233b5bed
font_01_sfnt_off00012713.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12713 18652 bytes
SHA-256: 315fc6194967867c3aacf841725b7dfa6ca488fd9bf88b4449ea99b2dc67df1c
font_02_sfnt_off000156f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x156F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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