Malicious PDF — malware analysis report

Static analysis result for SHA-256 db9c286693347126…

MALICIOUS

PDF

77.1 KB Created: 2021-09-28 23:54:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f1cbc72f5aa5e065ada28c83b9a6f1a SHA-1: aeb9b599133dc51b2b7d4cf9ba8cded364ba55a7 SHA-256: db9c2866933471267fbc5eb4e97a5cc07c65866ecfb8894e39cb17c75c3ce501
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links pointing to potentially compromised websites, suggesting a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were directly extracted, the presence of external links and the nature of the heuristics point towards a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

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://tianlanlawyer.com/filespath/files/20210913130531.pdf
    • http://fanta-life.com/userfiles/file/jomokur.pdf
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613d529f46ee0---satojutelox.pdf
    • http://ore-processing.ru/d/files/68308183746.pdf
    • http://www.platformliften.info/wp-content/plugins/formcraft/file-upload/server/content/files/161518bbe2cab8---rudaf.pdf
    • http://mega-gold.com/userfiles/files/95646038007.pdf
    • http://24hnbc.com/assets/ckfinder/core/connector/php/uploads/files/fixugabegobesaxaxuzur.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/6c847b64ffc8168064009be8323069f0/23711311791.pdf
    • http://lagrupacio.cat/file/daremubugojebuzexek.pdf
    • http://kondicionery-bronnitsy.ru/upload_picture/file/12788768130.pdf
    • http://petgears.com/app/webroot/files/file/duluwotigak.pdf
    • https://xetnghiemadndanang.com/upload/userfiles/files/34823331609.pdf
    • http://www.kymenhome-etsinta.net/tiedostot/files/gesuvojunujiz.pdf
    • http://alltimescare.com/attachment/files/86031199822.pdf
    • https://bartonsteel.com/tony/barton/ckfinder/userfiles/files/74303830908.pdf
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/svhb2dkm4v1tp3a70d4vlmpt6n/jijujolezufevejexe.pdf
    • https://medbillings.us/lightspeedweb1/file/tikopujudiko.pdf
    • http://esejsc.com/upload/files/purenaguririjajesafexo.pdf
    • https://jpt.mysmartedu.com/uploadimages/files/56547868783.pdf
    • https://veglifekc.org/wp-content/plugins/super-forms/uploads/php/files/11340331102.pdf
    • http://microsolder.hu/userfiles/files/jogiwog.pdf
    • http://mh-gartengestaltung.de/userfiles/file/63108864354.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=hello+neighbour+game+android
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b052.bin
96197918d2aaae0054e003228f6332d06ca7f433973421da413822d643fdcb79
pdf-font-stream PDF embedded font (sfnt) at offset 0xB052 18800 bytes
font_01_sfnt_off0000e0df.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE0DF 16792 bytes
font_02_sfnt_off0000f8f0.bin
01cd0e4798e93fb086042d610f43ddeed7bf091af48aa863f5c4a4f61b651684
pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F0 16232 bytes
font_03_sfnt_off00010eca.bin
12dffbaef6c6ba581141f77d460f544016d6c19c345ddd00ceb0e1073ffdef53
pdf-font-stream PDF embedded font (sfnt) at offset 0x10ECA 10660 bytes