Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf18914f970a5cd8…

MALICIOUS

PDF

74.8 KB Created: 2021-09-23 22:51:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b21025d7224ad942ea72aae2e3f33880 SHA-1: 132046f6c58e08e755337e2552ec0f57c6660383 SHA-256: bf18914f970a5cd8742a078806a5426a7db991b7db4abf68a07849c23a25ad7f
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous links, many pointing to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of external URIs and link farms indicates an attempt to lead users to potentially harmful websites.

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://medicaldistri.com/ckfinder_files/files/givedoguretitokala.pdf In PDF document text
    • http://bigbulkbags.ahmadpackages.com/survey/userfiles/files/revenujevujexodekeru.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1614a10a88ca15---93803510341.pdfIn PDF document text
    • https://globalmediaminds.com/uploads/files/nalafoxorijimikuf.pdfIn PDF document text
    • https://hsse.hssanesteban.cl/files/fowidijowevusasuma.pdfIn PDF document text
    • https://successalpha.team/upload/files/sedefijosopawupakofevuf.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/ab47e0ce80f1ec6933989326baeb8573/xanowufirimokasese.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/87397840802.pdfIn PDF document text
    • https://tims.ro/ckfinder/userfiles/files/58978176993.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/35715831383.pdfIn PDF document text
    • https://telenovella-bg.com/files/defejidaruras.pdfIn PDF document text
    • http://ellev.fr/upload/files/fazajejudijaloj.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/78448156225.pdfIn PDF document text
    • https://mangallagn.com/images/file/76943150890.pdfIn PDF document text
    • https://paroles-vives.com/ckfinder/userfiles/files/84735019603.pdfIn PDF document text
    • https://bselink.com/userfiles/file/69508851621.pdfIn PDF document text
    • https://artcorner-fiberglass.com/userfiles/files/jinerijozolifo.pdfIn PDF document text
    • http://vet-arrighicolangelicristilli.eu/userfiles/files/8195388533.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/86658280728.pdfIn PDF document text
    • https://mldom.xyz/web/img/podborky/files/dixutosokamet.pdfIn PDF document text
    • https://fivetc.net/uploads/files/34455031060.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219211258225182.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161494dec60f9e---33988605124.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed1ce5d1ef---77721110082.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=instagram+private+profile+viewer+no+verification+free+2021PDF 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_off0000bf71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBF71 16672 bytes
SHA-256: e2b311ed88adb45a1c7383432a75ffb37403afc5a2d57b94dcedcc6af2ee823a
font_01_sfnt_off0000ea2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA2A 11220 bytes
SHA-256: 70a2534e960f9b7b4b47664548b1082f3464e48b99caa9589543e985e09a7967
font_02_sfnt_off00010496.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10496 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1