Malicious PDF — malware analysis report

Static analysis result for SHA-256 368052853812cbfe…

MALICIOUS

PDF

82.3 KB Created: 2021-09-03 01:38:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 1ca776e2e96376c092dff996a2131b5b SHA-1: 6b54be266439ff8792d795e3d77531779002b18f SHA-256: 368052853812cbfe1fd96b444bd8d2371049f4a613bd4bf8e4e26409a10cc62d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. No scripts were extracted, but the PDF structure and embedded URLs point towards exploitation of the PDF viewer or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/9db054aaf0ecb1fc0376fbc08513115a/nigigabipajovogosokasijad.pdf In PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/faa3bfcb3e88beb8a38c6cac925cbe00/votaxo.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a89ae35c952---dosadiwegelalejugidorel.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/160d3cc992497d---99319962110.pdfIn PDF document text
    • http://ecoaga.com/documentos/file/wojumimenagabimabas.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/84a64b555caac17bb472384874e7365d/62532625815.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089f013544bb---rajodugolofesufe.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607a232da7116---bojaxi.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/94112754624.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607774b33c4a8---67093290502.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/24564484369.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/66443384016.pdfIn PDF document text
    • https://spectrumohio.com/wp-content/plugins/super-forms/uploads/php/files/1cfb94e71961f58d55530490fc66d031/80814963538.pdfIn PDF document text
    • http://bularz-auto.pl/images/userfiles/file/77388095594.pdfIn PDF document text
    • http://cdn.eagle.mn/uploads/userfiles/files/likavipetolegiwegi.pdfIn PDF document text
    • https://zold-kommando.hu/files/61417969071.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160b88eb631ba0---20999831677.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/xererireforubowa.pdfIn PDF document text
    • https://francois-daulte.com/ckfinder/userfiles/files/juritatenapugigukabew.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/87236019483.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160773d3ac01f4---87844472440.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/93945480529.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/86806451712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=2000+honda+prelude+manual+transmission+fluidPDF 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_off0000db9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB9A 17892 bytes
SHA-256: 9d15167bc4e32a7fcf4ff14759d93d709c72d5a79ae8797659f7bd9a9dafb055
font_01_sfnt_off000109f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12207 11008 bytes
SHA-256: c95b95834d0b53be7df4bcf92cf7f2e4a8cc44c5de939c6dfd19b9d3a02a4487

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