Malicious PDF — malware analysis report

Static analysis result for SHA-256 1353c29ef19114ce…

MALICIOUS

PDF

98.3 KB Created: 2021-07-28 12:08:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 2fa0b8cf406f8d8976067cb11aac8b0f SHA-1: fd9276777c62b1d3319576a7886584305392ef81 SHA-256: 1353c29ef19114ce0511b9c7b756e46f9754f6bfaf2437c09d9286069c6199ec
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous links, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute further malicious content. The presence of these links and the overall structure indicate an attempt to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9927

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.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/160729aff5e12d---39507467538.pdf In PDF document text
    • https://petroblend.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f71c6b415e---wekedobag.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/10622046056.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e952828db9---43873417898.pdfIn PDF document text
    • https://sarujiovalente.com/wp-content/plugins/super-forms/uploads/php/files/ulf4vmqrvue6m73d3d8guesrv3/nipad.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce9fa9d9405---teluburi.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072d4f91e1fa---98355477743.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/bc60587077ad9630687e64aa3040f3af/24225864106.pdfIn PDF document text
    • http://mu-rrrc.com/userfiles/file/51777632839.pdfIn PDF document text
    • http://olddieselparts.com/ckfinder/userfiles/files/86539338528.pdfIn PDF document text
    • https://meccanicagambirasio.it/file/71041794208.pdfIn PDF document text
    • https://tecsal.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b2d6f61a1a2---48027042477.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/8mq0ld3rcc8sf07jsfugdlh2l6/54049379419.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b318feb9af1---goguduxerolox.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/poxanulinezufukogujol.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/pupinav.pdfIn PDF document text
    • http://cottoneauto.it/userfiles/files/wegapibeta.pdfIn PDF document text
    • http://forumts.com/ckfinder/userfiles/files/62161485969.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/r2d4regn4l63lra9ien8jpcbg6/83801052138.pdfIn PDF document text
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/1cc9ca262ed4b7cb568e617e70a77412/keledunirikutamiperel.pdfIn PDF document text
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1606eb8940ec0f---fuliwaxesuluvidojawuveja.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/c80e8230cc8a4f23154e6a35c7cef917/83717126125.pdfIn PDF document text
    • https://caffedisanto.it/file/zidogapumewobex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=nutrition+et+organisation+des+plantes+4eme+exercicesPDF 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
stream_003_off0000faab.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0xFAAB 18320 bytes
SHA-256: 36490f93d8109c0ddc055504c832263d0d67d6c3cd8a0e547e41dae9c4512a1e
font_01_sfnt_off0001177a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1177A 18780 bytes
SHA-256: 8297606f75122f43edd6b4f0c10cfce50850e58a623e9de2f94a6c1927e124e4
font_02_sfnt_off000146b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015ecf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15ECF 11116 bytes
SHA-256: 245de088d78e12b86d3bf702b13ada392463ea5319202b6abff3c89968a86cf0

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