Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad5db94876e33bd6…

MALICIOUS

PDF

82.3 KB Created: 2021-06-10 10:20:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-24
MD5: df70b3fddd569172f874825e9e29fa2d SHA-1: e6db9e684c72cd6d515159ee4dc643b1a4bf17a0 SHA-256: ad5db94876e33bd6fa02b0ee16929ce7ff4e5a8a2c0b6ff0116353d938c6f59b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document is identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document employs a link farm strategy, hosting payloads on compromised WordPress sites, and uses a lure of 'homework answers' to entice users. While no scripts were directly extracted, the PDF structure and URL patterns suggest it is designed to exploit vulnerabilities or deliver a secondary payload upon user interaction.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crewmak.ru/uplcv?utm_term=exponential+growth+and+decay+homework+answers PDF link annotation
    • http://www.champcaregivers.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c306ec508---51867710875.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/387ddb40d9929300bbdb67f6b2235ebc/97473765645.pdfIn PDF document text
    • https://mrmusicfoundation.org/wp-content/plugins/super-forms/uploads/php/files/lfbc1a7glbj3tnoijjtilf8nm6/nabilizovurarujopez.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/868e8ea9c9aed2c92afbb57a5d6023be/pidedoritejuf.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/lizapewowotitefoju.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/dc9d4e7bfd2b68ba235213a5c7406a30/4908600987.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/20496055255.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/55fed53q6805pu1jlge22a8m34/xamelezifuferojubej.pdfIn PDF document text
    • http://alphaconsultinggroup.us/vpw/images/file/binito.pdfIn PDF document text
    • https://www.karavanlakesfet.com/wp-content/plugins/super-forms/uploads/php/files/8e5c4ca9423c3cd1449a11367eafd3ae/94541642801.pdfIn PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaa131587---46470903954.pdfIn PDF document text
    • http://chi-kara.net/userfiles/file/taletukeji.pdfIn PDF document text
    • https://pristineleather.com/userfiles/file/48532649652.pdfIn PDF document text
    • http://thm-holding.ru/wp-content/plugins/super-forms/uploads/php/files/f05d11eb7b490c0b28ecb65a30cc8dc4/50844760307.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1607cee17b456d---78874761953.pdfIn PDF document text
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607c5dbd2b7c5---32246001109.pdfIn PDF document text
    • https://portsidestrategies.com/wp-content/plugins/super-forms/uploads/php/files/fd3dc1ef6d2d8d15518ab973b2d62430/40834584992.pdfIn PDF document text
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/odolos0ur52peheev1lripm9f3/12655301402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://e1pl2.nazwa.pl/busy/fotki/file/movuvilujimo.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc97.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC97 5772 bytes
SHA-256: 6f66891ca965946b038d891c6c73c4312d839a3505910864476fb6f4ced233cc
font_01_sfnt_off00011032.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11032 12900 bytes
SHA-256: 2d1ef695e18a1e91252b1d4c132f7c71a83b392cd19e930e265316c2bdae9b9c

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