Malicious PDF — malware analysis report

Static analysis result for SHA-256 75f3233f9bb8764a…

MALICIOUS

PDF

88.7 KB Created: 2021-08-05 09:14:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: c145148e63e1a536511f1ae8cced5910 SHA-1: c6774628faf2c4b5d9d90bb5c1949e7bd36b7b4e SHA-256: 75f3233f9bb8764a04eaf8b2701af557d983119f631d4c11e68199a7f6578741
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external URLs, many hosted on compromised WordPress sites or disposable domains, suggesting a phishing or malware distribution attempt. The presence of PDF-specific heuristics like 'PDF_RANDOM_URL_LINK' and 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicates malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' further supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://synerhu.ru/uplcv?utm_term=rain+bird+1800+operating+instructions PDF link annotation
    • http://albatrossmrn.com/konadnew/userfiles/file/18578735937.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160729e0d35756---fusofewudepik.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/011423338865.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/8ae014525c38315da966ad3c89144977/28627779974.pdfIn PDF document text
    • http://broorybulldogs.com/clients/33993/File/24697312113.pdfIn PDF document text
    • https://feriaesotericadeatocha.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ea502c37b2---34824852010.pdfIn PDF document text
    • http://stellamaris.cz/userfiles/93422407796.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aebbbc11176---runuwogutozewojejofobom.pdfIn PDF document text
    • https://censcakmu.org/board/file/files/23477421341.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608b48b5cc1f4---3490416675.pdfIn PDF document text
    • http://ggmtc.net/userfiles/files/46219509166.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/16102e3ea1fc17---kenixatuvafagarevubo.pdfIn PDF document text
    • https://stagerightstaging.com/wp-content/plugins/super-forms/uploads/php/files/26313488d31c8513693bc10b2813a7f1/99851164760.pdfIn PDF document text
    • http://starlightcelebrates.com/clients/4/43/43e9139217482d7666ce300faf566241/File/60860668746.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/pakax.pdfIn PDF document text
    • https://rebates.forex/wp-content/plugins/super-forms/uploads/php/files/1bqd0uuri8egeoh0g958qhkd61/14829523778.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160e9439784e77---savakar.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160861d021185c---timosezetawikafal.pdfIn PDF document text
    • https://www.ppmcare.co.uk/wp-content/plugins/super-forms/uploads/php/files/3q4jithl8j78te1jao809122r5/72618703556.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/gadenigatotiso.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/55057821293.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_off0000f02d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF02D 18636 bytes
SHA-256: d48c056830f94ee3173a7d3fded364f59f866bab54aedf24c38062b68342446c
font_01_sfnt_off00012158.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12158 11312 bytes
SHA-256: 34d0fe8f9ceffa46051a5c162a4a5f0f9ec6d49b561f7f8f087d7735d9e306fa
font_02_sfnt_off00013ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BA8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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