Malicious PDF — malware analysis report

Static analysis result for SHA-256 12ab97077c00ddbc…

MALICIOUS

PDF

97.6 KB Created: 2021-08-03 12:16:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f6b291d346cd0806e272cbd6575e3794 SHA-1: 1d07c97721468934cda0d898d4fd2d1b9eafe619 SHA-256: 12ab97077c00ddbc27dee99ff1c6b0b0dd683e88521e1005d5db214176289776
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, with numerous URLs pointing to potentially compromised websites or disposable domains, suggesting a phishing or malware distribution scheme. The presence of multiple PDF link farm heuristics further supports this assessment.

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://chcial.ru/uplcv?utm_term=20+ejemplos+de+lenguaje+comun+a+lenguaje+algebraico PDF link annotation
    • http://luxe-pools.fr/i/File/58567357808.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210719175035.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a745bb47830---tifuzesusudus.pdfIn PDF document text
    • http://ugyvednok.hu/userfiles/file/gakirixefemifaxawafedud.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13424266953.pdfIn PDF document text
    • http://iideree.org/wp-content/plugins/formcraft/file-upload/server/content/files/160f9f034a8862---97800324991.pdfIn PDF document text
    • https://bakwanudang.com/contents//files/mobobidurafatepawugemitak.pdfIn PDF document text
    • http://stalmost.pl/userfiles/file/32528971734.pdfIn PDF document text
    • http://budoprojekt.eu/obrazy/file/8151574851.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160989862c928c---zegiv.pdfIn PDF document text
    • http://srividyaastrology.com/userfiles/file/91321139147.pdfIn PDF document text
    • https://www.vedaaz.com/wp-content/plugins/super-forms/uploads/php/files/c76fa086f154dd5e2e401d41aaf422f9/lewumo.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a3969837bc7---galeniba.pdfIn PDF document text
    • http://xn--ob0bjxt9h99icicrvkksa421cwwp7hiv4d6a.net/ckfinder/userfiles/files/toxelumelukexujex.pdfIn PDF document text
    • https://www.oneirishrover.com/wp-content/plugins/super-forms/uploads/php/files/c95bb8da71a4c37b0526576e3a37aa3c/87648198659.pdfIn PDF document text
    • https://hotellemaritime.com/hotel/upload/files/bobimuxibegofigisaj.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/gorisibupi.pdfIn PDF document text
    • http://www.ponderosafestival.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607770b6bb18a---26860276554.pdfIn PDF document text
    • https://aduanaldelvalle.com/userfiles/file/40622329769.pdfIn PDF document text
    • https://duocvinhkim.com/userfiles/file/guzipipujelag.pdfIn PDF document text
    • https://study4student.com/cache/fck_files/file/lukojokemuvojeg.pdfIn PDF document text
    • https://eyetracking.pl/userfiles/file/nugibirezexivexunovixide.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/tuun63povdk292eqghm7r14su7/11681085069.pdfIn PDF document text
    • https://oncallanatomist.com/ckfinder/userfiles/files/48450302693.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/95273347696.pdfIn PDF document text
    • https://digitaldaya.com/imagenes/file/56529519759.pdfIn PDF document text
    • 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_off00010fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000127b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B9 20128 bytes
SHA-256: 3329b21500fd8276d8bb7671166820d9ead92df8cef46a3348b383ac7f198ed1
font_02_sfnt_off00015bb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BB3 11276 bytes
SHA-256: d39f1b94c147ea2669ec3462d491ba132fff5a56a55ce165408994cf1f780de7

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