Malicious PDF — malware analysis report

Static analysis result for SHA-256 e42f8c18ea33e8d9…

MALICIOUS

PDF

82.2 KB Created: 2021-09-23 02:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 5446cba1208868aaa3cb8cf0203dcd7e SHA-1: 36f7665eba8aded049de041bb01ad517a1c9e351 SHA-256: e42f8c18ea33e8d97b4e04c94544eb310809c80e25db47437bbb49d9a93ffc3f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, specifically identified as a phishing trojan by ClamAV. The document contains a link farm pointing to compromised WordPress upload storage and other disposable hosting, suggesting an attempt to distribute malicious content. Although no scripts were directly extracted, the nature of the links and the detection indicate a likely phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://papinchess.ru/userfiles/file/63595435803.pdf In PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/161460136d108a---tipaxatudawifejejugezeja.pdfIn PDF document text
    • https://nisahanpin.com/calisma2/files/uploads/35419272625.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/99607236885.pdfIn PDF document text
    • http://aerotherminsulation.com/userfiles/file/nojewolexil.pdfIn PDF document text
    • http://travelbilet.ru/sites/default/files/file/66742829555.pdfIn PDF document text
    • https://arrad.ch/modules/ck/ckfinder/userfiles/files/59225083027.pdfIn PDF document text
    • https://willes-gb.com/uploads/files/202109140634457795.pdfIn PDF document text
    • https://www.myjamaicais.com/wp-content/plugins/super-forms/uploads/php/files/3935228b69047fa79685ce691f294d60/zafoxetokepubane.pdfIn PDF document text
    • https://motoralbini.it/files/file/nusumomasaraxosisof.pdfIn PDF document text
    • https://larrialdiak.es/files/galeria/files/12371303238.pdfIn PDF document text
    • http://sherwoodonionfestival.com/ckfinder/userfiles/files/pisufawitiret.pdfIn PDF document text
    • http://dailyliving.nl/ckfinder/userfiles/files/kamomozizejoxej.pdfIn PDF document text
    • http://hondaototanan.com/upload/files/xapakirapenol.pdfIn PDF document text
    • https://qian-ho.com/upfiles/editor/files/61699532140.pdfIn PDF document text
    • http://www.udelimpa.es/ckfinder/userfiles/files/82544005089.pdfIn PDF document text
    • http://www.papelerialapiceros.es/ckfinder/userfiles/files/53895007012.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/160da0e2cf08b7---nabemisurinabavujaja.pdfIn PDF document text
    • https://univerosg.com/ckfinder/userfiles/files/11012710885.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/7927364060.pdfIn PDF document text
    • http://www.gitialiganjlko.org/ckfinder/userfiles/files/vaboti.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/xafevemezidobisutes.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=the+holy+blood+and+the+holy+grail+pdf+free+downloadPDF 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_off0000da4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA4B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f25d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25D 18340 bytes
SHA-256: 30e06f9f79b696e4e3eee56225ef5df073845ef976dc357381d196eb2848372e
font_02_sfnt_off000121ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121BA 10912 bytes
SHA-256: ab3360d7e2175d523ff5a450a74615064dc49b5cd0e7eff478afe12815f54b5d