Malicious PDF — malware analysis report

Static analysis result for SHA-256 c05947102562e07b…

MALICIOUS

PDF

68.0 KB Created: 2021-09-26 22:29:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c7cff9fe6deffe1f859137aedbe12830 SHA-1: 8ca8af036a6d72d02718c02bc22c8ef38b66ce60 SHA-256: c05947102562e07b2fa2cc3fc3c14d3999de5ff82bb51f685aed81db27d06868
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It functions as a link farm, containing numerous embedded URLs that point to compromised CMS upload storage and disposable hosting. These links likely serve to redirect users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/gqhstkeglqfaqq33i276eb5t76/tasubunif.pdf In PDF document text
    • https://tpk-m.ru/files/file/galemiba.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16136cf0ab72d6---buvegotozolikibajirezorex.pdfIn PDF document text
    • http://bargiel.com.pl/ckfinder/userfiles/files/duxugejulobadofo.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/jivol.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109052129144239.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614e487f46e5a---5372254639.pdfIn PDF document text
    • http://betheaskssd.com/flash/betheaskssd.com/file/nisafopirexokun.pdfIn PDF document text
    • http://attilacenter.org/userfiles/file/86361873635.pdfIn PDF document text
    • https://goez1.com/10005001208290177/ckfinder/userfiles/files/72859258548.pdfIn PDF document text
    • http://houstontca.org/Content/uploads/files/zomakigalorale.pdfIn PDF document text
    • http://ihdbd.org/upload/files/tupuzudixiji.pdfIn PDF document text
    • http://mastrodibaglio.it/userfiles/files/fijadix.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/76832190388.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/70684312711.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/73599150189.pdfIn PDF document text
    • http://rs-entp.com/upload/file/nodibatilasugap.pdfIn PDF document text
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161343e9dc53e4---borelalixojixo.pdfIn PDF document text
    • http://secretinvitation.net/images/files/dexujaze.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/64653480042.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/06clmroden175hfit04pj2te0c/sogitawejexu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=how+to+crack+phone+lockPDF 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_off0000ac3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAC3E 10380 bytes
SHA-256: d2e771565a181b4bde85e2c431d9c191aa8121123e77055d92d862c0a2b59ddd
font_01_sfnt_off0000c3b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC3B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dbc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC4 15216 bytes
SHA-256: 6a293bfba9cceb9809c24701a6744864a898670b9ba938d2451d721f89f13ec5