Malicious PDF — malware analysis report

Static analysis result for SHA-256 b08b9c4c181479a0…

MALICIOUS

PDF

72.4 KB Created: 2021-09-28 02:01:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e414f07add21516d57e11f4d5e89d5f7 SHA-1: 9b7335237146259248ba02b18d382d5c4416e1d4 SHA-256: b08b9c4c181479a09c8b73b411f778ca13e9572e3f5496ad233ca29c7f9f659b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute further malicious content or phish users. The presence of multiple PDF link farm heuristics reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/525bec80cd5bab1019d2c34c8c55ac9d/xigejumagelatatukemevetor.pdf In PDF document text
    • http://cabinet-blin.fr/ressource/site-image/files/79235951588.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/86113980918.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/57e1e474a48bcb21a3e243d1689470af/41615536669.pdfIn PDF document text
    • http://ver9ctrl.sonikgps.com/ckfinder/userfiles/files/37300999127.pdfIn PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/selugevamoxotukulepijow.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/161428ac611779---likowavunerivizeki.pdfIn PDF document text
    • http://koreabulk.net/userData/board/file/50631625913.pdfIn PDF document text
    • https://cylinder96.ru/admin/ckfinder/userfiles/files/topopuragapodavuv.pdfIn PDF document text
    • http://3m18.com/images/editor/files/44067378563.pdfIn PDF document text
    • http://seasplendorpetro.com/userfiles/2663159644.pdfIn PDF document text
    • http://marinda.ru/pics/images/file/fojutosijuxufanapopukoror.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/muwudemerudebuvajimez.pdfIn PDF document text
    • https://38e5bbdfe8be.gdziezjesc.info/userfiles/file/faminimerugikodakawef.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/92577769460.pdfIn PDF document text
    • http://elitvorota.ru/f/file/zegelujizekesitubop.pdfIn PDF document text
    • http://www.greddy.com/admin/common/ckfinder/userfiles/File/37186067035.pdfIn PDF document text
    • http://klusjesindex.nl/images/uploads/mipolu.pdfIn PDF document text
    • https://tw-itemaos.com/ckfinder/userfiles/files/litafox.pdfIn PDF document text
    • https://www.ijmsir.com/ckfinder/userfiles/files/79051816712.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=age+of+civilisations+2+apkPDF 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_off0000b464.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB464 18104 bytes
SHA-256: 015c1eabc05c6bb3d6011fc5a333e5f419a31c4e5b05be46a7e76ca95f8724e8
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10816 bytes
SHA-256: f39b3435e4938cce71574c47b3c1c207956e15da3f655ee10262c5f978130b1e
font_02_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1