Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0fbea0bb8e5533…

MALICIOUS

PDF

69.4 KB Created: 2021-09-27 22:48:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7341c6135c20c8651522d15b17a9991d SHA-1: a9e027b866f7358da5f4bf2d24868f26b1e39c7d SHA-256: 3b0fbea0bb8e55335710df45dfac9fe452d8d0c1241338bf6702bb09864ff192
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. The presence of multiple PDF-specific heuristics related to URI and link farms supports this conclusion.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://huntic.ru/uplcv?utm_term=root+android+using+kali+linux PDF link annotation
    • http://hoteldanang.com/uploads/images/files/99892995601.pdfIn PDF document text
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vimorikuxenek.pdfIn PDF document text
    • http://willettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/39333311802.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/1615009d000e52---27257768473.pdfIn PDF document text
    • http://colegiosantarosa.com/uploads/imagem/file/lilos.pdfIn PDF document text
    • https://ailani.org/wp-content/plugins/super-forms/uploads/php/files/df57c058142afc34224fef4250ec7986/53724061938.pdfIn PDF document text
    • http://bodegaadrover.com/userfiles/imagenes/nepuzoterez.pdfIn PDF document text
    • https://mosaicopeoplecorporation.com/ckfinder/userfiles/files/xurepasapumulilev.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60463876639.pdfIn PDF document text
    • http://tractortools.cz/ckfinder/userfiles/files/27325511504.pdfIn PDF document text
    • http://d2dgroup.net/upload/files/bikililojoxojufesi.pdfIn PDF document text
    • http://dgxzz.com/uploadfile/file/36959051712.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/tejabe.pdfIn PDF document text
    • http://abbuffalowings.com/uploads/files/paburasi.pdfIn PDF document text
    • http://thuexe7cho.vn/upload/files/78802997599.pdfIn PDF document text
    • https://vanvoorst.info/uploaded/file/50825707287.pdfIn PDF document text
    • http://levotst.com/uploads/files/limodigesipex.pdfIn PDF document text
    • https://danielstrehlau.com/userfiles/file/22087595233.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/deropomuvagabusijolaf.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/kolijulubeg.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/gixadiwudevetisisajifosug.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161493dc095d03---77284483993.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_off0000af5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5D 10632 bytes
SHA-256: 20099f2af89cd618ec6607b87d96ffc8be3f01fcf961b783705a03a013465edf
font_01_sfnt_off0000c79b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC79B 15788 bytes
SHA-256: 437ddfe47eb3402bdbae54310a378b1f9b763df96c3aab9039f3f6618b0c1b8b
font_02_sfnt_off0000efca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1