Malicious PDF — malware analysis report

Static analysis result for SHA-256 9750ddabd900bdf8…

MALICIOUS

PDF

79.3 KB Created: 2021-09-18 01:25:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 3c96d78dd3748beffd8e8dc3c85a9853 SHA-1: e9e27822b27dab0d4cfe6fac4fabfebc44156250 SHA-256: 9750ddabd900bdf89b0711fc67971e2fcbdc71ce5a986d50707b46a555a2ad9e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution by redirecting users to malicious sites. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=why+we+sleep+matthew+walker+free+pdf PDF link annotation
    • http://gemculture.com/userfiles/file/zimasijumodajalekitunaxok.pdfIn PDF document text
    • http://ducthoaudio.com/upload/files/matogimorobot.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/47107752.pdfIn PDF document text
    • https://www.thaiahpa.com/flash/files/vekizo.pdfIn PDF document text
    • http://kme-kme.cz/files/file/votifekusupadaxikema.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/16141149686ffd---vebegujijeragufe.pdfIn PDF document text
    • https://www.spoton.pet/wp-content/plugins/super-forms/uploads/php/files/ho6ov9l3tn6t4keen91cmfa3lc/kododi.pdfIn PDF document text
    • http://wasserburg.pl/userfiles/file/667473675.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/40451561001.pdfIn PDF document text
    • http://rilta.net/userfiles/files/pigatuj.pdfIn PDF document text
    • http://xn----9sbbnbtte4cyg.xn--p1ai/ckfinder/userfiles/files/neruxebinebopateredopewi.pdfIn PDF document text
    • http://tuecpa.com/file_media/file_image/file/fopuwuponenirezemaxes.pdfIn PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1612f5a156c958---33483956185.pdfIn PDF document text
    • http://recepti.plovdivweek.com/js/ckfinder/userfiles/files/sofudiloxupo.pdfIn PDF document text
    • http://eksternest.be/images/file/84666604071.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/kezofi.pdfIn PDF document text
    • https://hoya.hr/UserFiles/file/94563582107.pdfIn PDF document text
    • http://xn--80aer5aza.xn--19-kmcm3c.xn--p1ai/ckfinder/userfiles/files/vimutefujo.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/67185999400.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d8a116ba4c---46577239498.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b1a3e9242---libudebolo.pdfIn PDF document text
    • https://www.a2zmedical.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0be2bc712---59114682179.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_off0000d345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB5C 10732 bytes
SHA-256: 42a58d5d9817135bcd2e29927c715fdc26307cba7d3623b95f00067d675c08ee
font_02_sfnt_off0001041f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1041F 16784 bytes
SHA-256: 2d94a10ba929df2244fd725b55d47ff2d8dfa2407002173906dd7965133ac62e

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