Malicious PDF — malware analysis report

Static analysis result for SHA-256 8f93e64d1348fec5…

MALICIOUS

PDF

70.0 KB Created: 2021-09-30 21:31:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 47005dd197173884db5f73887207ffd8 SHA-1: 9e45ffdb65e2a613ed09ebafdda761b34c1ae313 SHA-256: 8f93e64d1348fec5da96614ec7e14ac272671ad8ae7c3d5f7150123e05dbcace
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ML classifier and ClamAV, specifically as a phishing trojan. It functions as a link farm, containing numerous URLs that point to various domains, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external, potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://indianspringhomes.com/userfiles/files/raxawiraj.pdf
    • https://quatden.vn/webroot/img/files/jadevirekaxafozu.pdf
    • http://farmina.ru/uploads/files/zefusugugijafito.pdf
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/4528020751.pdf
    • https://bhiringisamsankalimandir.org/ckfinder/userfiles/files/kedavabugosonupekibuze.pdf
    • http://constructionone.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16151eaffd5fc6---liwatibaroz.pdf
    • http://traktor-tv.de/sites/default/files/file/wedotelumufuwexitewomi.pdf
    • http://seanmore.com/userData/board/file/zezigugije.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/c842b7bf261556d97ef3291d7f199903/37935803562.pdf
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16151d366c80ec---11353387700.pdf
    • http://driver-jazda.pl/upload/file/73327051384.pdf
    • https://www.indoorclub-informa.com/boletines/img/file/suredezajib.pdf
    • http://nemeckystrakac.sk/editor_uploads/files/26737140786.pdf
    • http://mathahospital.org/userfiles/file/zasemiwu.pdf
    • http://artikos.pl/userfiles/file/gavidozozetibawitinup.pdf
    • https://twr1115.net/files/fckeditor/file/pukuxeninobevegobub.pdf
    • http://asid.rw/userfiles/file/33205015773.pdf
    • http://cuacuonbinhduong.com/upload/files/wororigos.pdf
    • http://immobilieninvestors.de/userfiles/file/simogij.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/7d997ba2e66d55391b4df8645019f90c/ropedadivod.pdf
    • https://yesilkoyluleriz.biz/resimler/files/gukonejibefot.pdf
    • http://yucehukuk.com/resimler/files/dowubifa.pdf
    • http://anapharmata.hu/ckfinder/core/connector/php/files/14478382989.pdf
    • http://ke-sen.com/userfiles/file/1631877766.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=rblx+city+codes+2021
    • 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_off0000b2c4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB2C4 16792 bytes
font_01_sfnt_off0000cad6.bin
c678eb26edeaae06ce7868654574eaea69b56064c925d5691d1e25a85ebefd5d
pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD6 15196 bytes
font_02_sfnt_off0000f152.bin
b36fbae17100660447bc99c3331a212ab43ae5db36c109ed9cd171bc930f4743
pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 10692 bytes