Malicious PDF — malware analysis report

Static analysis result for SHA-256 aebc04607d64aeb5…

MALICIOUS

PDF

84.9 KB Created: 2021-09-08 00:11:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 19ee247f3a3421b01ce825e3f5e85eca SHA-1: c0571f0989f4014840325896f5fc597cee9ac8fa SHA-256: aebc04607d64aeb598ddf76d0d8cbd4c1fde6e2a7bbce83d60c80795a832a6db
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress upload directories, indicating a link farm or phishing attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and the ML classifier's high score further support its malicious nature. The document body is unreadable, but the heuristics and URLs strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609fd15f4de5a---41734937697.pdf In PDF document text
    • https://www.hemoroidklinigi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070784e8ccc6---sedikuxuwi.pdfIn PDF document text
    • https://juraganmonyet.com/contents//files/32911644790.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/35c88b241bf04948023bdc4cc6c9f132/90594576675.pdfIn PDF document text
    • https://starwebline.com/calisma2/files/uploads/19599546440.pdfIn PDF document text
    • https://webtraffic.ch/wp-content/plugins/super-forms/uploads/php/files/f3r3d9t2o8b1ktp1i0r9utaitb/tilafobazavelixuruvupaz.pdfIn PDF document text
    • http://zhhyhb.com/uploadfiles/files/33191170.pdfIn PDF document text
    • https://dtcprojects.com.au/wp-content/plugins/super-forms/uploads/php/files/lohnpp3hdu9pv411ama15u0i2t/xeregubom.pdfIn PDF document text
    • http://195exim.com/datas/files/retubogapodopa.pdfIn PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/98aaea64d8fa826651481f0367bf373d/buvafiwotobufogafifano.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/cn4fft6nobotqgg5dsajg5g1k2/47595392093.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080115e2a836---wipasizanavon.pdfIn PDF document text
    • http://alacarte-design.de/userfiles/file/xalivojisop.pdfIn PDF document text
    • http://ourpreferred.com/userfiles/files/xetosala.pdfIn PDF document text
    • http://lavalnerina.it/userfiles/file/45051172442.pdfIn PDF document text
    • http://mmckno2010.zkosuchdol.info/files/62181333247.pdfIn PDF document text
    • https://lawpropertyconsultants.co.uk/wp-content/plugins/super-forms/uploads/php/files/gk13h6k07diq8oqb3s9biqnli1/lasezutitixuvaxo.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160ee521872534---8015898080.pdfIn PDF document text
    • http://zoncmswebsitebeheer.nl/files/editor/file/sonodobuvum.pdfIn PDF document text
    • https://www.reparaciondebomba.com.ar/wp-content/plugins/super-forms/uploads/php/files/a6qb3lhl4k1808m9l9magnuh43/ziwitukifowebunuwele.pdfIn PDF document text
    • http://clairerolo.com/userfiles/file/87034641386.pdfIn PDF document text
    • http://dashoernerboot.de/userfiles/tudeluj.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/i5qq4o73bg124ja4cng15jkuo5/11140895739.pdfIn PDF document text
    • https://dycmc.com/DATA/upload/files/202107162205264711.pdfIn PDF document text
    • http://studioarchperissinotto.eu/userfiles/files/sajawudonukovubimotulabi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=fiscal+policy+and+monetary+policy+worksheetPDF 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_off0000e52c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52C 18312 bytes
SHA-256: b715f8b62fe94337c02cc101a3ed931f6d10facefe4b284d685492f7efa01054
font_01_sfnt_off000113d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012bf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BF0 11048 bytes
SHA-256: d9e126e0e827c5bf51ba751011f04e39717f64f32a2186fed24f686c44344a2a