Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3a3f9262e435bb1…

MALICIOUS

PDF

84.4 KB Created: 2021-08-28 17:56:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: fef1b7921a8cd3c38e01e9501045063f SHA-1: 3fca180bb4d48bd5d4697747f0e7c9a3c86cc862 SHA-256: e3a3f9262e435bb1aa545c90fddccd50c8bf56f45e662f2c3f1e22a6078154ef
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to external resources, many of which are hosted on compromised websites or disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to exploiting PDF vulnerabilities or redirecting users to malicious sites. No scripts were extracted, but the structure and URL patterns are indicative of a phishing or SEO poisoning campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/9760af3a2e4dff7bee4111f3df5ad800/50140379376.pdf In PDF document text
    • http://ebonit.light.bg/includes/libs/ckfinder/userfiles/files/gupofamajifibelasuf.pdfIn PDF document text
    • http://jaika.in/images/documents/files/6351215335.pdfIn PDF document text
    • http://tweddlefoto.com/files_contenidos/upload/files/22885528504.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3cc60c592e---mujowimatojaziro.pdfIn PDF document text
    • http://springbook.no/files/83850045112.pdfIn PDF document text
    • http://weddingdiy.cc/uploadfiles/files/20210607_110516_4452.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/tidazabisivomiture.pdfIn PDF document text
    • http://sporteambiente.it/ckfinder/userfiles/files/womoxulanaluwif.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/guvoritokapeladixa.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607262bfbe833---wujezafabamos.pdfIn PDF document text
    • http://bukharasuwanee.com/sites/default/files/file/49682946567.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ddea425bb1---87966360192.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160c78435e1b31---gudonatagurewowaw.pdfIn PDF document text
    • http://monkey-do.net/userfiles/file/18114722250.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210503190149101.pdfIn PDF document text
    • http://halongbaycruises.org/upload/files/merirunug.pdfIn PDF document text
    • https://ahl2005.com/ckfinder/userfiles/files/nakifofe.pdfIn PDF document text
    • http://ar-intl.net/wp-content/plugins/super-forms/uploads/php/files/mur91hno4fjh6q6ukfgqu9hqf6/24535460431.pdfIn PDF document text
    • https://staffxrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/9dd2099387c1520e183146d155d676d5/nawovizibotis.pdfIn PDF document text
    • https://www.helmmsp.ca/wp-content/plugins/super-forms/uploads/php/files/f9d161bea0e7dae14f2108b84a2cbdcb/178815127.pdfIn PDF document text
    • http://nakatka.com/files/file/netezepi.pdfIn PDF document text
    • https://egyiksem.hu/uploads/file/9330464989.pdfIn PDF document text
    • https://benjamindreyer.com/wp-content/plugins/super-forms/uploads/php/files/f9f3fa38dc3a99cf4dc83b5f74f41e15/rakuwe.pdfIn PDF document text
    • https://adikketiga.com/contents//files/felejakejopuwejizotoxepaw.pdfIn PDF document text
    • https://www.histoiresdegroupes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b19d390bca3---newojozuf.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=real+steel+boxing+champion+modPDF 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_off0000e3b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B9 11148 bytes
SHA-256: 96fff212920ec444a3d71b3bad5cd307695a8c759fd6cafbb67b2fd82660fcf8
font_01_sfnt_off0000fd2e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2E 17520 bytes
SHA-256: 277d919e5fb3fbfb5b57e8fd4f9e36aa11762ba2c065b7281f1db62836714eef
font_02_sfnt_off00012af9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AF9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1