Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c6c87cd168536e4…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 16:58:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: a566584be0385f8bacd9e7d52cf1e94c SHA-1: 7b07fd51d694f87982939e8e7552a3787c178f14 SHA-256: 7c6c87cd168536e444f3ea08ab94c638886147f71ee2079fdcb3b3f62d56e410
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting, suggesting a link farm or phishing lure. The PDF_URI heuristic specifically highlights a URL with a 'utm_term' parameter, indicating a potential marketing or tracking element used in phishing campaigns. No scripts were extracted, but the overall structure and URL distribution strongly suggest a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://crewmak.ru/uplcv?utm_term=show+me+the+number+1+trillion PDF link annotation
    • http://dansecyr.ca/pdf/file/ditadodasapulofela.pdfIn PDF document text
    • http://bundoreh.com/fckeditor/files/file/zuxuwozigusududadazovudu.pdfIn PDF document text
    • http://otczenacts.com/media/files/33567288242.pdfIn PDF document text
    • https://antoinepanau.com/wp-content/plugins/super-forms/uploads/php/files/9cbe6064e50b08b2a462804b3e78a1b1/vidigizixujo.pdfIn PDF document text
    • http://novelinternationalschool.com/ckfinder/userfiles/files/wafotabodatexawote.pdfIn PDF document text
    • http://machin.kr/userData/board/file/visazawugudesirosifo.pdfIn PDF document text
    • http://sumtinathholidays.com/admin/uploadfiles/file/87510434317.pdfIn PDF document text
    • https://www.pessin-location.fr/ckfinder/userfiles/files/vutema.pdfIn PDF document text
    • https://amagi.la/wp-content/plugins/formcraft/file-upload/server/content/files/1613040fd2b216---pogebagasoberoganuzavoza.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/89455929647.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/bepomomavi.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/kofireduwewor.pdfIn PDF document text
    • https://premiersuli.hu/files/files/20935010119.pdfIn PDF document text
    • http://dieta-plus.pl/userfiles/file/75613766406.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16147b393c2d3c---78325162113.pdfIn PDF document text
    • https://smobiil.eu/userfiles/files/7918283351.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/8548872763.pdfIn PDF document text
    • http://obkladlazby.cz/userfiles/file/87141384060.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16130d14c4b1a6---kupaxixobaruzug.pdfIn PDF document text
    • http://asirakademi.com/resimler/files/divodadupagov.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f02e0c2fff---76028802617.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146e5d9600f5---80635547248.pdfIn PDF document text
    • http://media-production.net/admin/ckfinder/userfiles/files/bofefikufaj.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/55497430111.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_off0000de2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE2D 10496 bytes
SHA-256: 8741585446d3cbbd9529c2b31103f6b7cdf87aa9c4a15cd6d3149b54179bc39f
font_01_sfnt_off0000f5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5E7 18980 bytes
SHA-256: 8f8601c1ef1874011c3fba0b02252a6c0616f37deb716af8719ec8c2d574448a
font_02_sfnt_off0001276c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1276C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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