Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e104f41362c78f4…

MALICIOUS

PDF

84.4 KB Created: 2021-06-28 14:24:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 4775d0287e51ada79961fe291674c96f SHA-1: 73091454c30e6d30199d1eea048f612e9f6377c5 SHA-256: 8e104f41362c78f4d834b01822724b550da5b768c3f9ee75215040d295795f4e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised WordPress sites and employing UTM parameters, suggesting a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://archism.ru/uplcv?utm_term=screening+interview+questions PDF link annotation
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16091e4337f64f---83068031313.pdfIn PDF document text
    • http://paradisoseminatrici.it/userfiles/files/kisux.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aa2418d5d3d---29337770406.pdfIn PDF document text
    • https://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609189d691a97---funefivajizutevinekew.pdfIn PDF document text
    • http://www.truca-taoules.com//ckfinder/userfiles/files/romam.pdfIn PDF document text
    • http://totaleclipsenv.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088b08274a58---visunelunamegime.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/gesepow.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/0941a328df1ab3210986bdd657f32faa/gatiboduvofere.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/0c99bfcc4ea717c9c64253491ada6f3a/82000164025.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/lawefakasawar.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2b62fd4791b310ed2cd9bbafb29b36a6/96725865491.pdfIn PDF document text
    • https://europeancustomtailor.com/wp-content/plugins/super-forms/uploads/php/files/26ea72dfed96a0c9d0f786ef6e0edea2/zipitajafek.pdfIn PDF document text
    • http://fouladsazanco.com/Upload/file/nejelifikezuziserutemi.pdfIn PDF document text
    • http://kwong-cheong.com/userfiles/65021757026.pdfIn PDF document text
    • http://momsystem.ru/public/file/viloxaxejonizepunir.pdfIn PDF document text
    • https://blueridgelightingandcontrols.com/wp-content/plugins/super-forms/uploads/php/files/03a48f789b7614e62c2edac508a345ca/85411827629.pdfIn PDF document text
    • http://mashtalkandil.com/userfiles/file/29463098513.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082abe70e359---26999285961.pdfIn PDF document text
    • http://mid-europe-ex.com/lufov.pdfIn PDF document text
    • http://centrons.com/uploaded/file/111199244760d000cf37a47.pdfIn PDF document text
    • https://costumeworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160878ae172f20---kaxozomubibo.pdfIn PDF document text
    • http://cbelmira.com/wp-content/plugins/super-forms/uploads/php/files/0ft2bjmehejn34ang4jp6bngb0/30381083773.pdfIn PDF document text
    • https://biomedchita.ru/imeg_master/file/topanasawewetegaxu.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/82311927558.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/kojafisupapatiguxa.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_off0000e7d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D5 10672 bytes
SHA-256: a18875fd60ba3110d9a237ba333e1670b356ce46894be84c7e318b8726ce4202
font_01_sfnt_off0001002a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1002A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001183c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183C 16932 bytes
SHA-256: 146c1c72221c337a3d1e8b2c18f3a5ad88d2165602026174fcf90dfcd71707b3

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