Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca34374bdfbedb7…

MALICIOUS

PDF

104.7 KB Created: 2021-08-21 00:27:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 5b343df8758d63382f02018e329e79db SHA-1: 902c0fc7308cda4dabea600aa36f843b2d18ae3d SHA-256: dca34374bdfbedb744dddcc426359727346e141b6c45f5a430eb2fb8e1188ecb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ketchas.ru/uplcv?utm_term=informerande+tal+%C3%A4mne+lista PDF link annotation
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/333a1fa39a8deb79419500f863f134ae/92661390158.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/nosodox.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/jpn3af7ed5niekmfjamg8jjnf1/18316927945.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/4732394573.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/fufegasotija.pdfIn PDF document text
    • http://agisma.ru/files/pages/files/33474017055.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/67390518803.pdfIn PDF document text
    • http://gphs100.com/clients/e/e3/e3ed30f4e85b1ff1e74f61348c82e8eb/File/51431651897.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed6c158a90---ligoxonezatero.pdfIn PDF document text
    • http://medicalproduct.hu/images/files/nidapejapefi.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cad3463cb4---86190086083.pdfIn PDF document text
    • https://gabinetpro.pl/kosmetyczka/krakow/files/24482547119.pdfIn PDF document text
    • https://pima-alarms.rs/slicice/file/ligepiwobovuf.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/4128f1ebebf0c639e9a3de5652cf768c/24703421601.pdfIn PDF document text
    • http://baihsad.com/userfiles/files/20210712_211648.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881a4d41dd3---fuxumuvoduvixupub.pdfIn PDF document text
    • http://stkvn.ru/wp-content/plugins/super-forms/uploads/php/files/afa618fc0e6c7f99e17f86bdefedf69e/zidanexalugiratabewilere.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/b62052c98a93dac2e90a8ca8d24a0ed4/56196073902.pdfIn PDF document text
    • https://medok18.ru/wp-content/plugins/super-forms/uploads/php/files/a20ee22f6671d02fae8771540bf9f118/58812150903.pdfIn PDF document text
    • https://edoxmarketing.com/wp-content/plugins/super-forms/uploads/php/files/mgu2n52sf60qub28ub1e1aulan/tabuluzapezawuvobevikuki.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/160f0e0ea2ede1---71342624598.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/bdc1cf714d0e50bfad3fa3508d2dfd57/73595200281.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_off000131ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131AC 10724 bytes
SHA-256: 98b1fd6ef835a8e71f4f436a7e180aec224382e4f4172e983a649633791b2d2a
font_01_sfnt_off000149b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x149B5 19240 bytes
SHA-256: 368a41846539376586c77779c658da319ccf2887f342512541addcbe591fbae5
font_02_sfnt_off00017a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A6C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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