Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f52e699d9acc33b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-11 14:50:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 2f161e33ab0714533d53b4ddc20abc5f SHA-1: aa4d148ebf82fed4c14593973a2be4dae1d466f6 SHA-256: 6f52e699d9acc33bae1a3b6e4f33438ec18273eb1e874cf54e4915fe3ed14560
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to other PDF files hosted on compromised CMS uploads and disposable hosting, indicating a link farm designed for malicious redirection. ClamAV and ML classifiers confirm its malicious nature, likely for phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are strongly indicative of a malicious campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://michalpavlicek.com/uploaded/file/newujet.pdf In PDF document text
    • https://omnistopbollards.com/application/third_party/ckfinder/userfiles/files/lituvemuxebututizovuzimij.pdfIn PDF document text
    • http://www.orarestauratorisaf.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613260641ac70---fifigatigogeridubalexasi.pdfIn PDF document text
    • http://pagyesa.org/userfiles/file/20210905142802.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/90055115326.pdfIn PDF document text
    • http://rayanchem.com/d/files/famodanumebirexejepela.pdfIn PDF document text
    • http://studiosaletta.it/userfiles/files/lezab.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/70833268684.pdfIn PDF document text
    • https://frontiermyanmar.com/sites/all/libraries/ckfinder/userfiles/files/zagafukarurizerovufas.pdfIn PDF document text
    • http://rebeccafantarchitetto.it/userfiles/files/80498966105.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/lawitekeravokuxonetef.pdfIn PDF document text
    • https://lostsoulsmemorialnj.org/wp-content/plugins/super-forms/uploads/php/files/2e488fcf85d7c5495a0c98579003ae2f/53579202234.pdfIn PDF document text
    • https://laughteronlineuniversity.com/images/upload/files/33967920954.pdfIn PDF document text
    • http://studio5r.com/userfiles/files/63130034125.pdfIn PDF document text
    • http://kangshi-you.com/uploads/files/202109052308179122.pdfIn PDF document text
    • http://agrostroi-proekt.ru/ckfinder/userfiles/files/93770565888.pdfIn PDF document text
    • http://aeronautike.com/userfiles/file/nuzovonodur.pdfIn PDF document text
    • http://gizmakina.com/depo/sayfaresim/file/30881785790.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135072147655---pelulavarewulubid.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/riganipore.pdfIn PDF document text
    • http://okfilm.kr/userData/board/file/96149206962.pdfIn PDF document text
    • https://namdolove.com/FileData/ckfinder/files/20210903_8404342E37B71DF6.pdfIn PDF document text
    • http://sswjeans.com/files/75510111484.pdfIn PDF document text
    • http://utpcomp.ru/uploads/files/54629703186.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=dragon+mania+legends+modsPDF 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_off0000b7dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB7DC 15648 bytes
SHA-256: d3d6ce43a59ebb7a8bd85e9be4c2142806c9c7ed73052d3f3d263a138d60eb53
font_01_sfnt_off0000df80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF80 10496 bytes
SHA-256: a9cf547a1cbbc6065d592db1ce182cae70b44f0e1b57f0f3447bb2097efd3826
font_02_sfnt_off0000f706.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF706 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1