Malicious PDF — malware analysis report

Static analysis result for SHA-256 c50ce578476e1845…

MALICIOUS

PDF

111.9 KB Created: 2021-07-21 02:46:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 0edbb0c60643b5dc46d8cfa0e3dd2bfb SHA-1: f45ac90e4b17a365776f129b7d2a6cd573544d20 SHA-256: c50ce578476e1845835b83f1c960299b76b510a2a0219c59491c2e66f766b68a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous URLs that point to compromised CMS uploads and disposable hosting sites. The primary purpose appears to be directing users to external, potentially malicious content, which is a common phishing tactic.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9868

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://klccpa.com/userfiles/file/38573796412.pdf In PDF document text
    • http://barrybusiness-crm.com/ressource/devis-photo/files/sozuronap.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b7d24b108cd---37856996757.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/zafajulasarakozexewad.pdfIn PDF document text
    • http://dreiseengrundschule.de/files/noguniwemida.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609075138ae1f---vikerisapadoxetenilan.pdfIn PDF document text
    • https://standardpromotion.com/images/upload/userfiles/files/86439284755.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4342cd4cd---jubopovirelatewazanadom.pdfIn PDF document text
    • https://psychotherapie-dr-albrecht.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a75c5a01ccf---fovegepevetabowemoxaba.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2aa89c44e4---60030775128.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ce244127b66---77571813132.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/16086d31710dd4---bawadelola.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607964fd7f634---gasote.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/36ddab40b7da1e8da0086fff6dc7f805/jolamegefino.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/85631679912.pdfIn PDF document text
    • http://zulaikhatextile.com/userfiles/files/2817739341.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/160708e0d8edb7---53464832480.pdfIn PDF document text
    • https://aquaticlandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9358b6873---50719608392.pdfIn PDF document text
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcbaaa5cdd3---17515405275.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ccfe88f8da---53418073036.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/20846019781.pdfIn PDF document text
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/mp10d00djlm7kpb589ql1mjs8a/24178679199.pdfIn PDF document text
    • https://razdolle.by/wp-content/plugins/super-forms/uploads/php/files/0uvik270ig3csogga5nvnrks15/94455595117.pdfIn PDF document text
    • https://www.bocamvigliesrooms.com/wp-content/plugins/super-forms/uploads/php/files/d1da335aff1ff945752f1631b826ecd2/bozizepikokes.pdfIn PDF document text
    • http://nktrading.qa/file/files/34013889731.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=dua+to+protect+from+harmPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00017b67.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x17B67 30644 bytes
SHA-256: ec7e1c7139cf1dccc6280cc80542bd6cd0cc41a9ec36e929e2bb26fdc18ab4e6
font_00_sfnt_off00011eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000136c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136C2 17296 bytes
SHA-256: 4baab5df7a4a98a18e8549113080cf9e1517f87e1b7989bba0b3b5d39816a318
font_02_sfnt_off000163b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163B4 10436 bytes
SHA-256: 70357dc14bca05d85cf06ad644cf3254f190da40baa3f4e3ec402029cb4f0a7b

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