Malicious PDF — malware analysis report

Static analysis result for SHA-256 159cf879334b4f38…

MALICIOUS

PDF

71.5 KB Created: 2021-09-04 14:19:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: c29e267646f9a8862e9254f486b98808 SHA-1: 47e1f631b878bcafe39bbd794b93897e603a10ef SHA-256: 159cf879334b4f3800f5e3462a5df1bcfa5b9b5d4fe1752c8fd256ad2c33ae02
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier returned a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload storage or disposable hosting, suggesting a link farm designed to redirect users. The presence of these links indicates an attempt to lead users to malicious sites, likely for phishing or further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://bugaboo-buffalo.eu/UserFiles/File/74983216875.pdf In PDF document text
    • https://www.hintonassociates.com/wp-content/plugins/super-forms/uploads/php/files/c9baffbb92392807b05f8663ab49560a/roludej.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/5019d09b58e0d4c64b00ca5d98597cf3/domewofuko.pdfIn PDF document text
    • http://banphimchuot.com/userfiles/file/35457756888.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/49539697327.pdfIn PDF document text
    • https://readandenjoy.ae/userfiles/files/75253666970.pdfIn PDF document text
    • http://alteredcompta.com/buddha/ckfinder/userfiles/files/kevirobuwezonitokubebav.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f3c02a4e5b4---90376036271.pdfIn PDF document text
    • http://panziofabian.hu/fck_kepek/mobijafugoxinanusanewa.pdfIn PDF document text
    • https://altonika.pro/files/fck/file/jewufaraxorupelipad.pdfIn PDF document text
    • https://a-1commercialkitchenservices.com/ckfinder/userfiles/files/83776694837.pdfIn PDF document text
    • https://megashina24.ru/files/files/fuviwifemutaziluteloduf.pdfIn PDF document text
    • http://www.atrium-tuiles.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609490c6a0ee4---vojukeminezen.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/37993520173.pdfIn PDF document text
    • http://infinity-pro.ru/userfiles/file/16889000725.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/56725179223.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160b4b1f2b9116---92746683481.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/56612787279.pdfIn PDF document text
    • http://bearings-home.com/userfiles/file/11288734785.pdfIn PDF document text
    • http://quick-thailand.com/images/uploads/file/81353767166.pdfIn PDF document text
    • http://outspokenholland.com/userfiles/fckFile/20210530221937.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-6-26/20210626094254149697.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=toyota+avalon+2015+manualPDF 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_off0000b75b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB75B 10448 bytes
SHA-256: 3d7f2506c47700fb525fb0c00d47b24dedd40bbc8192aafc110ccc05f8bbe182
font_01_sfnt_off0000cf3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e751.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE751 16192 bytes
SHA-256: f0ddf2ba6b99223aa41d5bd15e461dd20ae3129a243ead8ac01120ead544aefa