Malicious PDF — malware analysis report

Static analysis result for SHA-256 53b1c75bfa97cc0a…

MALICIOUS

PDF

83.6 KB Created: 2021-09-24 07:04:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e702d5d896fdc15b9ab3d083f6cf1fd0 SHA-1: 7a94570c23a033b4f8339fd501f90843c99dc33d SHA-256: 53b1c75bfa97cc0a04e5fd30d07ee6abd7be349d29e3a24b6d586f2677211f50
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous links to compromised WordPress upload storage and other disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The PDF structure and embedded links point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://sbnjl.com/userfiles/files/70215003950.pdf In PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/majiwuvipedipeminip.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614282891acde---55832251961.pdfIn PDF document text
    • http://qcfloor.com/userfiles/file/14720548673.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/06274ff1055bad9ff8dcf513cf9f8c00/50273319832.pdfIn PDF document text
    • http://gaudi.tw/upload/files/wuwolelewafuforutawikito.pdfIn PDF document text
    • http://yakutiaprime.ru/SITE/files/editor/file/93597458153.pdfIn PDF document text
    • https://petroservice-eg.com/userfiles/file/roxogipekajomunokojipug.pdfIn PDF document text
    • http://bimbrlata.cz/UserFiles/File/fozemuvopanobosefavotaj.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/68791203363.pdfIn PDF document text
    • http://www.movingintofreedom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410d9584b1e---80608641471.pdfIn PDF document text
    • http://nieruchomosciklodzko.pl/files/file/beninez.pdfIn PDF document text
    • https://xn--psg-9lac.hu/files/files/98179436312.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/bc83df2d90821e486c788c866b5a9a03/67687138600.pdfIn PDF document text
    • http://1careglobal.com/upload/files/38912246031.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/xilafukipavawapewil.pdfIn PDF document text
    • https://hoangphatdanang.com/uploads/image/files/berikijojulevenifazi.pdfIn PDF document text
    • http://whuntex.ru/userfiles/file/zigupomudoreru.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613808b000d73---71420590849.pdfIn PDF document text
    • https://pactforfamilies.org/ckfinder/userfiles/files/99126517353.pdfIn PDF document text
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16134e8128b3f7---52679502217.pdfIn PDF document text
    • https://worldmedglobal.com/userfiles/files/10830610162.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/96188e089ee0928b7be1cbda77e0f067/davixew.pdfIn PDF document text
    • https://glbtrader.com/userfiles/file/9270250763.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/rafisurenuwatukofob.pdfIn PDF document text
    • http://budgettranslation.hu/sites/default/files/file/12224176286.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=blacklist+apps+download+for+mobilePDF 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 17992 bytes
SHA-256: c7aa458ff6df566ae70ca89ea8f47351c3a8b077551cecacf2a84f2862ddfa53
font_01_sfnt_off00010e3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012655.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12655 11152 bytes
SHA-256: 9333d2a4b98b8db127ab4c304d1df745ba65bff9f7547b8992563cb16c1720e6

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