Malicious PDF — malware analysis report

Static analysis result for SHA-256 e41840e15d317317…

MALICIOUS

PDF

84.9 KB Created: 2021-08-09 11:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 243f6af719205633f9de14dce65b4e6d SHA-1: 777c75196b763d123f9d1222fa68b0fcf0e0d036 SHA-256: e41840e15d317317a82d3b85d2c3a372ee61037ad2439168ea5fe755af24a3da
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The PDF structure and embedded URIs are consistent with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 http://absolutelyneon.com/userfiles/file/vapex.pdf
    • http://fecirturizm.com/resimler/files/labotexozozoziwo.pdf
    • https://www.yoursurveysurveyors.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082df13654fe---namazojefubopebusef.pdf
    • https://rubin2000-distribuitorshop.ro/userfiles/file/xarod.pdf
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1609938d33a8a5---24180255999.pdf
    • http://cavusofis.com/images_upload/files/3373701844.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070348d5703b---faxunilapasa.pdf
    • https://bandai-k.com/userfiles/file/74815877121.pdf
    • http://liburnia.pl/userfiles/file/gexivegazumiraxik.pdf
    • http://studiopol.it/userfiles/files/69106483687.pdf
    • https://xlspandoek.nl/userfiles/file/bizezimoxafidivaf.pdf
    • http://digilit.ir/basefile/digilitir/files/wuginefobelape.pdf
    • https://isosklo.cz./uploads/66829942982.pdf
    • http://ventilatoryzlin.cz/images/file/fatededu.pdf
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7b963b2f5873d142d08364426970e0fb/93353030404.pdf
    • http://samurairamenbar.com/uploads/files/87884308906.pdf
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160caab8c96441---40828613231.pdf
    • http://music-summer-courses.eu/upload/files/vosanarosamudabifugugav.pdf
    • http://sciattella.net/images/file/43886873797.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160a0d19752068---jiselijuvowitamabamur.pdf
    • https://cmetrix.net/ckfinder/userfiles/files/97322213872.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/0d4no277fvr7gmccke3sg0b4g7/93881228292.pdf
    • https://hijaulumut.com/contents//files/59234773070.pdf
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093a573ba7f3---zalorefa.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=certificato+anamnestico+porto+d%27armi+2020+pdf
    • 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_off0000e785.bin
f45172acf0726149057e2cafa6db6f0698a168dafc078f7087ec6e103376731d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE785 17688 bytes
font_01_sfnt_off00011440.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11440 16792 bytes
font_02_sfnt_off00012c57.bin
ace34198768ac6f7f07096fa3a8658a8deabc52f2dd280e7ad23b6b97f0ae4ae
pdf-font-stream PDF embedded font (sfnt) at offset 0x12C57 11040 bytes