Malicious PDF — malware analysis report

Static analysis result for SHA-256 e364c28e469b9cb7…

MALICIOUS

PDF

86.1 KB Created: 2021-09-07 09:49:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: edb99509605bad44059fbb6ab7edcb7b SHA-1: b1791f091b9bf47207999ba856f4e4c6d18bbe0b SHA-256: e364c28e469b9cb7f89e596f049aa0f5f97e5f08ef616a287071ae784a851280
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this, indicating the document's primary purpose is to distribute links to potentially harmful sites. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 https://queure.ru/uplcv?utm_term=alternating+current+circuits+4th+edition+pdf+free+download PDF link annotation
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/nhladd215399slsrigs9s4r6st/wuxetanu.pdfIn PDF document text
    • http://makaroma.fr/upload/file/42533811230.pdfIn PDF document text
    • http://firmen-bekleidung.at/userfiles/file/60191737164.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612efe01daec4---fuwowatakegogebetozo.pdfIn PDF document text
    • http://fkm-lux.by/var/upload/file/moxob.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/tevidofokami.pdfIn PDF document text
    • http://upasamed.org/Content/uploads/files/jowefojepanigexuf.pdfIn PDF document text
    • http://hoacanh.net/luutru/files/31277363333.pdfIn PDF document text
    • https://maconlux.lu/userfiles/files/10219859813.pdfIn PDF document text
    • http://steakclubhn.com/campannas/file/niveripibipu.pdfIn PDF document text
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/bamasezerifiguxejipo.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/c65d6e1cc45db4cd5a6f8d3533d41023/5066590465.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099d5cfea05b---96061481324.pdfIn PDF document text
    • http://cnex.cc/images/blog//file/ginidorusofexazerur.pdfIn PDF document text
    • https://www.masismarketing.com/wp-content/plugins/super-forms/uploads/php/files/1e44b003c4ce93a823770d74b2b1848e/dixijelotumarufidid.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/gukubanur.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/d8562ae9cd8bbeb46f09af8a7cf74932/juvekeburujigudejikap.pdfIn PDF document text
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/f1c4643bc2d3ee474e5ad80187a7da27/56115378559.pdfIn PDF document text
    • https://bowenpainter.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707dd712a4b---21569882614.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c50a90597fa---valobekukimikup.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16121b24a7949c---56277397082.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_off0000e75a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE75A 11144 bytes
SHA-256: a419266f5b08b13ceb6b8b29c52130e33c31f2e194d04f71c709c0eddcbcf956
font_01_sfnt_off00010142.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10142 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011954.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11954 18768 bytes
SHA-256: f3606074a7f51542b1db396b3a6db24405569044819615dd84732ead06c2b0df

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