Malicious PDF — malware analysis report

Static analysis result for SHA-256 3483fb49f33cfc2c…

MALICIOUS

PDF

81.8 KB Created: 2021-09-06 04:48:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: ef78371c1a02fa625cd31583985c3312 SHA-1: 647afd3fbe66a2d0a8938357798fd806550333ac SHA-256: 3483fb49f33cfc2cee6751112ba50fb866072f9d45814715a56b375abfbbdad5
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are indicative of malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/04bd86a1020252bfd562ad3493afbd64/reridukogimatow.pdf In PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f2e1fa40d7---29175905497.pdfIn PDF document text
    • https://prosaison.fr/userfiles/files/26361419464.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/12734216440.pdfIn PDF document text
    • http://leton.pl/userfiles/file/63978158933.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1609401b29d44a---pipumem.pdfIn PDF document text
    • http://daearesort.com/FileData/ckfinder/files/20210608_235646E194D452A6.pdfIn PDF document text
    • http://solac.nl/app/webroot/files/userfiles/files/gusinedopejonugikoga.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c58fee591cc---jatozumobarotezuzurigugar.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7b2f7407e5---27116904375.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/4b26d1288446195139830c397f66b080/bididixinonawavejonojewos.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/14870182363.pdfIn PDF document text
    • http://hainescentreasia.com/images/file/biwizosebatugeb.pdfIn PDF document text
    • https://landbondcorten.com/attachment/file/d1151d15b8d2ba2318c2c2cada516460.pdfIn PDF document text
    • https://aihr-iadh.org/uploads/FCK_files/file/91576143796.pdfIn PDF document text
    • http://yer-krasnodar.ru/ckfinder/userfiles/files/vawedazuje.pdfIn PDF document text
    • https://dalton-english.com/userfiles/file/52321590646.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/30450e688efebadc5120f0f6bc05eaba/12874932731.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/98rkhntj3l6p9d7ieb48bk8g26/fadonumunefuxaga.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1608f57b8564e1---27842078760.pdfIn PDF document text
    • https://kaptenhoki.com/contents//files/lunifepose.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5c86d030---sokexuledobaxiliga.pdfIn PDF document text
    • https://certifiedmoversinc.com/wp-content/plugins/super-forms/uploads/php/files/19e330165d456d7304c6393e07a03a07/nigix.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/1vcq7mm7k7tqbh4d7argg86mu5/zetonejuvotatumadepan.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad335e741e1---79815623784.pdfIn PDF document text
    • https://www.alpha-dynamics.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160c636dbca84c---47397449984.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=frigidaire+gallery+washer+dryer+manualPDF 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_off0000db31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB31 10752 bytes
SHA-256: 003e013da802ea0b9f5565de5c17c02d7124331e64200d39651d2e25d4e33146
font_01_sfnt_off0000f377.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF377 17524 bytes
SHA-256: b51dde7fdb2d6f85626a5b51b6d5f237d882c286d89b3797b3d5c2605f0c8cb9
font_02_sfnt_off000120fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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