Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5a47c1b5066d335…

MALICIOUS

PDF

83.5 KB Created: 2021-09-21 07:29:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 59d3ea29f9bf40b065e7ec21789533a0 SHA-1: 76af66ebfe2c7395554ae3ea3cf78d4c51a24a05 SHA-256: f5a47c1b5066d335384e167a00b28b847f01cf5103a53e0095722c98ee04d72c
156 Risk Score

Malware Insights

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

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of a URL with a 'utm_term' parameter indicates an attempt at tracking or a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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=learn+python+the+hard+way+4th+edition+pdf PDF link annotation
    • http://testsitehq.com/ckeditor-ckfinder-integration/uploads/files/3046944135.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/3385e67706debf7303b76df44c0f1c4d/51553053788.pdfIn PDF document text
    • https://bnbcostaverde.it/userfiles/file/39695341473.pdfIn PDF document text
    • http://eurogeographyjournal.eu/admin/fckfiles/file/51787759130.pdfIn PDF document text
    • http://artmetinc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147943991de5---35313896395.pdfIn PDF document text
    • http://hotelgiottotorino.com/userfiles/files/javaxigajenatagako.pdfIn PDF document text
    • https://datatech-int.com/userfiles/file/lifolixopatidixunepawim.pdfIn PDF document text
    • http://yacpa.org/yacpafiles/file/pipumalixuzorude.pdfIn PDF document text
    • https://vdbergelectro.nl/wp-content/plugins/super-forms/uploads/php/files/ed3a9813b351b5694f4ca94689ed218c/goxazexirazuxumefik.pdfIn PDF document text
    • https://brusroom.com/wp-content/plugins/super-forms/uploads/php/files/f2dfd4f4cd8fb1358f7dac21754bbe2e/vesipumaxuluwip.pdfIn PDF document text
    • https://pepsima.biz/files/file/2388106087.pdfIn PDF document text
    • https://publicbridge.pl/userfiles/file/32633376656.pdfIn PDF document text
    • https://mn-lawfirm.com/box/userfiles/file/99594382085.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/guzoj.pdfIn PDF document text
    • http://balogmihaly.hu/UserFiles/file/43969228052.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/94327170328.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613919f6101e3---40938740749.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/bujakuvenepi.pdfIn PDF document text
    • http://kalmi.ru/upfiles/files/dasisi.pdfIn PDF document text
    • http://111-orte.de/testarea/cwsCMSlight/media/files/litisidikikirix.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/94781913051.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/geremonupoponomegesem.pdfIn PDF document text
    • https://rlmahtani.com/userfiles/files/gaduwafunukuz.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_off0000e27d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27D 17292 bytes
SHA-256: 07be094e4a7e43d295d8da84070db233e8123bf0a289beacb1424a519969a12f
font_01_sfnt_off00010f62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F62 10616 bytes
SHA-256: 9b01d6351d7c502be836a67dd00d49eb2b4d9f57226fb2cbde15ba30dce68c87
font_02_sfnt_off000127a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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