Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a914c90897cce44…

MALICIOUS

PDF

82.4 KB Created: 2021-09-01 05:06:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: aa9a2613236c961a9c8013aa527798fd SHA-1: d6cec29efbb371412097a082dc09864cb95ec8ec SHA-256: 1a914c90897cce441fda4b6eb87da49be9340439026b584539007cfa3091ae9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised or disposable domains, indicating a link farm or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. No scripts were extracted, and the document body was unreadable, limiting the analysis to the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://terezmisszio.eu/files/file/pifakamowolewudaja.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/olkp7lvpr8jo59ccd249tqqrb1/68334834027.pdfIn PDF document text
    • http://lukoilmarine.com/ckfinder/userfiles/files/livebebide.pdfIn PDF document text
    • http://urbanconstructions.org/images/uploadedimages/file/32545567245.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/160a05e46f120a---puziwumiru.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/97730555085.pdfIn PDF document text
    • http://mitsubishilongbien.vn/images/ckeditor/files/42697596343.pdfIn PDF document text
    • http://bajcsidavidfoto.com/_user/file/30757217023.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/85386823971.pdfIn PDF document text
    • http://loaamtran.com/files/usersfiles/files/71755425075.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff13ad0e531---32076495068.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/99047203524.pdfIn PDF document text
    • http://abnicum.ru/files/file/gukod.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/isnim1cd5uu0narq4cilo52jv7/77192289072.pdfIn PDF document text
    • https://renetravel.ro/images/files/gobexesafitudesomi.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/24b7877ebb7a8f9951110754813bca0e/panuratavurifuxe.pdfIn PDF document text
    • http://praguetransfer.com/files/file/ripukubugesanubamugotufum.pdfIn PDF document text
    • http://oprandi.it/userfiles/files/wimifozukawadulagilasowu.pdfIn PDF document text
    • https://varida-tech.com/ckfinder/userfiles/files/4854438264.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/mubefaxesazunonogedemesu.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608a6d44bfc05---2460745834.pdfIn PDF document text
    • https://www.spreefahrten-berlin.de/wp-content/plugins/super-forms/uploads/php/files/ec6tv49voe6daq4u6qpntvd2mp/76057493861.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=define+adenopathy+in+medical+termsPDF 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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF614 17424 bytes
SHA-256: c0206f62bf83f2c381111876d9624152dddeadf2802450265f31e8711d56802e
font_02_sfnt_off000122e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122E2 11000 bytes
SHA-256: c51bfb5a791317896e5960d708f973fa9f53bb44ae4feae31f9b39206289ec49

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