Malicious PDF — malware analysis report

Static analysis result for SHA-256 6738f28a49ce63c1…

MALICIOUS

PDF

86.5 KB Created: 2021-08-12 22:56:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: a68febe0e0747f520851781cad799a3f SHA-1: a2979180764d3ecf5b50311806bd4c59592af8d5 SHA-256: 6738f28a49ce63c1033354aa78e33c1c3e2ac4bd89a6d85a1a91f3d1970c7cab
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of multiple external URIs and link farm heuristics supports this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 http://aprendanow.com/wp-content/plugins/super-forms/uploads/php/files/dbc25dd34886a7a16e8e9dd10ccbe8b2/36271661139.pdf In PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/a77gkkjdkoe5pnqtvso4ecf61i/noluwimakalodebuxore.pdfIn PDF document text
    • https://binarbaidequipment.com/public_html/userfiles/file/tamulakuvekitodenibera.pdfIn PDF document text
    • http://wallsfamilyreunion.com/clients/876683/File/65966979941.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bb88047d272---dejom.pdfIn PDF document text
    • http://www.theflightfest.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5e1971a6bb---vopixafabis.pdfIn PDF document text
    • http://www.grupoaccs.net/ckfinder/userfiles/files/fafaditelesulezenujer.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094655a1fd59---2242201938.pdfIn PDF document text
    • http://w.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/jedagukexunagisinutewus.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/49453891248.pdfIn PDF document text
    • http://www.vitrierbxl.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606ca6ffc086e---pegiwibagomopobajijeb.pdfIn PDF document text
    • https://gsm.company/ckfinder/userfiles/files/62589678993.pdfIn PDF document text
    • https://muguet.fr/sites/default/files/file/xevenefojijawopusavasep.pdfIn PDF document text
    • https://web-sila.ru/wp-content/plugins/super-forms/uploads/php/files/74ab85d554450d67c2076f7411124551/meweregevusesabale.pdfIn PDF document text
    • https://vidolamerica.org/wp-content/plugins/super-forms/uploads/php/files/ecf0815241083aa96d717106cd585a88/vumemesasu.pdfIn PDF document text
    • https://24emk.ru/ckfinder/userfiles/files/73702851715.pdfIn PDF document text
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6bb4191fd9---popagijoleluleneperije.pdfIn PDF document text
    • http://abimobiliare.pl/pliki/File/walitavaxufejeropibo.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/mujonemelojuw.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607079399ec0f---fokozonetilizeris.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/57112668843.pdfIn PDF document text
    • http://kolbiko.com/images/uploads/file/6800964971.pdfIn PDF document text
    • http://sity-luxe.ru/userfiles/file/gixigizumumijevovuvudas.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=she%27s+dating+a+gangster+full+movie+english+subtitlesPDF 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_off0000ecc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC0 17296 bytes
SHA-256: cc82728e2c43bcfb9348fd459f6c8076d5fb1aff94738efb1a2141078417a993
font_01_sfnt_off00011a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A23 11216 bytes
SHA-256: a9b1487032cab16e798e8cf252446c2c611ff5932deae44e172c2f6bc22908bd
font_02_sfnt_off00013419.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13419 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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