Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4c782802ec69125…

MALICIOUS

PDF

93.4 KB Created: 2021-09-01 11:09:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 585ecb36dc266fd43a235234a3ae565b SHA-1: 07c06c078f24b6c12c8c98548efa851a10630ba2 SHA-256: d4c782802ec691257e52a68f31afa1ae114424c854a85d7caa924a18b9e1fb91
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ketchas.ru/uplcv?utm_term=oem+ball+joint+press+instructions PDF link annotation
    • https://globalcareerclub.com/FCKeditor/userfiles/file/piwusilojazew.pdfIn PDF document text
    • https://peptidturkiye.com/ckfinder/userfiles/files/62387635597.pdfIn PDF document text
    • http://albino-pitti.com/pub_img/file/jopekopodowujukogefeg.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/worokusinolikenisinu.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/a8df267b6799f1068776a13d1bb488f4/64355271083.pdfIn PDF document text
    • http://racecross.com/upload/edito_fckeditor/file/zomemejunojojodoreduv.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/5b82da4ff50f47d9339809586f988f1a/lukom.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1ee6e8549---tamerikugapifolimawuron.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/28r3knla23v844aa38bmnoreov/mufavivebidegulabuv.pdfIn PDF document text
    • http://amako-ra.com/wp-content/plugins/super-forms/uploads/php/files/185f749f77b8e69ea2525f964e094284/51644083820.pdfIn PDF document text
    • https://www.cocochan.com.pk/wp-content/plugins/super-forms/uploads/php/files/3a36b5cc3c04b3e56c18ce8ddbbecd3c/zukosidusebuj.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/b35d91a87a4e78a46f0e430a8b8d7f7d/zegutukipizironu.pdfIn PDF document text
    • http://boursemoi.fr/userfiles/file/50540937107.pdfIn PDF document text
    • https://kclandscapes.com/ckfinder/triplebuserfiles/file/pawobelukajow.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/jefaxu.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/tisurilapewoz.pdfIn PDF document text
    • https://www.audifonosdoshoydos.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c77c24e5---naririzolilazeviba.pdfIn PDF document text
    • https://travelstore.tn/userfiles/file/30968078145.pdfIn PDF document text
    • https://myhoorayhealth.com/wp-content/plugins/super-forms/uploads/php/files/sg5g9psir9sa693mbbkps46k95/tudosisoxibudiwerimotexuv.pdfIn PDF document text
    • http://blbr365.com/userfiles/file/1622884435.pdfIn PDF document text
    • https://fenixfalt.com/userfiles/file/59238893775.pdfIn PDF document text
    • http://podlahyadvere.sk/editor_uploads/system/files/44172854432.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_off0001072f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072F 18036 bytes
SHA-256: 1abbdcb2b0186b63efb4be47a891237f4a0a3bc04da3e08233bf104d83041f92
font_01_sfnt_off00013627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13627 10932 bytes
SHA-256: 1a1972a7f6c7696071f92e17a7e938a07a418d62ca078a43fdf1734a0eb7dc8c
font_02_sfnt_off00014f37.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F37 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1