Malicious PDF — malware analysis report

Static analysis result for SHA-256 b05f2ade423eae18…

MALICIOUS

PDF

83.4 KB Created: 2021-09-21 17:19:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d1d4972ae095c2daac122b295ded33dc SHA-1: 0bb48b6fffa51c74aa8b66c8d1c9b2266895e116 SHA-256: b05f2ade423eae1843bd08504f84ce3a393704eea5f57458473cca60d6652203
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm hosted on compromised CMS upload storage. The embedded URLs point to various PDF files, suggesting a phishing or malware distribution campaign. No scripts were extracted, limiting the analysis of specific execution methods.

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 https://thingstodobahrain.net/ckfinder/userfiles/files/60179721818.pdf In PDF document text
    • http://voszveszprem.hu/_user/file/lowebiv.pdfIn PDF document text
    • http://bridgeonlaw.com/filespath/files/20210902073103.pdfIn PDF document text
    • http://tuning-zone.eu/userfiles/file/zowijinukepovuvopoj.pdfIn PDF document text
    • https://bestrecycledautoparts.net/images_i/file/jusosigubet.pdfIn PDF document text
    • https://wittnebel.dk/file/xogobifif.pdfIn PDF document text
    • https://rmdschoolandcollege.com/wp-content/plugins/super-forms/uploads/php/files/c5b0790226a31de74788cfa449860bea/79467124519.pdfIn PDF document text
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613b4d0cf1923---sogojibidixufepa.pdfIn PDF document text
    • http://usefchina.com/uploadfile/file///2021091518304348.pdfIn PDF document text
    • http://skisun.it/userfiles/files/vusodujuxegorut.pdfIn PDF document text
    • http://protech.com.ng/wp-content/plugins/formcraft/file-upload/server/content/files/16138ca4938c67---54828314261.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc3b1e4ca7---solimanalolaw.pdfIn PDF document text
    • http://hocomesun.com/upload/63054330381.pdfIn PDF document text
    • https://ashasuchikala.com/ckfinder/userfiles/files/tekizevexebizevagubi.pdfIn PDF document text
    • https://nakatarikaszel.pl/app/webroot/userfiles/file/viroxogoledi.pdfIn PDF document text
    • http://teplorium.su/userfiles/file/verutolefadosobu.pdfIn PDF document text
    • http://rujiahk.com/uploadfiles/file/lepotubutoge.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/vikezibit.pdfIn PDF document text
    • http://aktasmatbaacilik.com/resimlerfiles/76975281862.pdfIn PDF document text
    • http://riskhedgetech.com/uploaded/file/16373192116148717d9f20f.pdfIn PDF document text
    • http://bouwbedrijfbouwheer.nl/userfiles/file/jipugijemewijawimixonero.pdfIn PDF document text
    • http://dalaichau.com/files/suluxilelevugewajobepulon.pdfIn PDF document text
    • https://renteci.com/imagens/file/memirukowutowi.pdfIn PDF document text
    • http://cesvil.it/filesUploads/file/tunabavuwigobazoleto.pdfIn PDF document text
    • https://atlantidegattico.it/file/2804278353.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=time+and+date+of+indiaPDF link annotation
    • https://mediaget.com/userfiles/files/lisesuliw.pdfIn PDF document text
    • 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_off0000e418.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE418 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC2F 10164 bytes
SHA-256: 272ddd32577a7fd0793b17bb456ffd4dacebb3529cec13cde38513a8a2a24af6
font_02_sfnt_off000112de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DE 17304 bytes
SHA-256: 288c0f78ef180175fcc35fcafdc7f5e3ec2714aaa38f6a973358f54d6bb12800