Malicious PDF — malware analysis report

Static analysis result for SHA-256 874719103937436e…

MALICIOUS

PDF

70.7 KB Created: 2021-09-19 21:10:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f3080ab90e02341cfea09952b1bed93c SHA-1: 6c1621de8afb042a2d91c3993767f3d0ee2c1edc SHA-256: 874719103937436e31bd6d62ef992a6d747f5245d6fa7e0ffdc1498ea5f14353
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains numerous embedded URLs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm or phishing attempt. The presence of these links indicates an attempt to direct users to external, potentially malicious, websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1613f1505cc0d0---87300574610.pdf
    • http://co-wemart.com/careeruserfiles/file/xowomopodidajagenejovizal.pdf
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_15_14_45_49_5662.pdf
    • https://www.auto-ecole-acm.com/ckfinder/userfiles/files/tukemalajaxepisizefamagi.pdf
    • https://jmclimatizacionhvac.cl/images/subidas/file/fozolikapewipub.pdf
    • http://finara-v.com/file_media/file_image/file/vesemapozipafotalefo.pdf
    • https://dermatologie-francophone.com/userfiles/file/65181975786.pdf
    • https://hometutorsdelhi.com/userfiles/files/29529267609.pdf
    • http://rassadaspb.com/new/files/file/20180787948.pdf
    • https://webrobogo.hu/kepek/semitaxokofuwafopax.pdf
    • http://erodiertechnik-wenzel.de/userfiles/file/39842978423.pdf
    • http://teleinwestor.pl/userfiles/file/93181729156.pdf
    • http://bjqyms.com/filespath/files/20210903225901.pdf
    • http://exoticland.bg/upload/files/files/zeratolapemarunetajurir.pdf
    • https://needletherapy.eu/upload/file/79140408363.pdf
    • http://cephedanismani.com/images/pages/file/73006895616.pdf
    • http://studiochiodo.eu/userfiles/files/53692591746.pdf
    • https://odontologosmalca.com/images/userfiles/file/15523553528.pdf
    • https://clinicaabrahaoosta.com.br/ckfinder/userfiles/files/roruvujilojaluvuli.pdf
    • http://remontnoedelo.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613de57b80fa9---3008903382.pdf
    • https://dom4m.com/userfiles/files/reber.pdf
    • https://atlantidegattico.it/file/fafizagupagomagi.pdf
    • https://www.lavishlook.se/wp-content/plugins/super-forms/uploads/php/files/6e1e68f88b5b4b8aa854a7ff8cbcfc94/vapexusota.pdf
    • https://olterus.com/contents/files/desaxageguxizozofupuwun.pdf
    • https://handientu.vn/userfiles/file/92662204743.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=car+eats+car+3+racing+simulator+fast+drive
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b3df.bin
6256ef0aa5fe417c30817bfced2cc17570d9fd6e8d545d9abdd6637efc9cbb69
pdf-font-stream PDF embedded font (sfnt) at offset 0xB3DF 11188 bytes
font_01_sfnt_off0000cde9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE9 16792 bytes
font_02_sfnt_off0000e5fb.bin
f49a39b5d009dac20118522bdff0d3965ef89a62fedccb988370486640d8ad85
pdf-font-stream PDF embedded font (sfnt) at offset 0xE5FB 15708 bytes