Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c6ad6c797d97680…

MALICIOUS

PDF

83.1 KB Created: 2021-09-16 08:17:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dbd2daa1d4f9e95439c127437bdeabeb SHA-1: cec3eb0ac3dcb9158ad9b9ed71ba67deaf200f24 SHA-256: 9c6ad6c797d976804169df456616e64bba5c4843425ec26f1942e25403f0c8e9
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or disposable domains, suggesting a link farm designed to redirect users to malicious content. ClamAV detection and ML classification strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://garglob.ru/uplcv?utm_term=pdf+reader+app+download+for+pc
    • http://imaginove.eu/data/Files/wedesofokowiliji.pdf
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/olmvnsins97v97mskf3a48f740/52174223433.pdf
    • http://ogcdc.org/uploads/ck_upload/files/kajafigo.pdf
    • http://mail-business.ru/uploads/file/netezovigenodiwiranatun.pdf
    • http://southportrubbish.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b5eb6245a---senasemizigodasutoted.pdf
    • http://nuyewrecruitment.com/wp-content/plugins/super-forms/uploads/php/files/ba1203ef98dfccfccb01e48de98d739b/refedasamekegal.pdf
    • https://riolisboa.com/images/ul_files/file/K1tOh9iGWBfP.pdf
    • https://vasutaszeneiskola.hu/ckfinder/userfiles/files/23569395144.pdf
    • http://metalzilembo.it/userfiles/files/dikavudirolabomifur.pdf
    • https://termofriz.rs/files/lujevovigazimelarofotutix.pdf
    • http://npcbalkan.net/ckeditor/ckfinder/userfiles/files/18501427662.pdf
    • https://thriveelearning.com/wp-content/plugins/super-forms/uploads/php/files/854ca75cb2366fbc08103bad6fc40b08/lexevutabebasegor.pdf
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/47851990808.pdf
    • http://englandmatchshirts.com/assets/file/63128266960.pdf
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/40168194363.pdf
    • https://self-storage.sg/images/uploadedimages/file/zanasidimiw.pdf
    • https://deshpanday.com/ckfinder/userfiles/files/xalotamiz.pdf
    • https://claphamjunction.com.au/wp-content/plugins/super-forms/uploads/php/files/267b5f3b9da37441d994d38da4dac960/wuwalunanevoveguwuvigede.pdf
    • http://peak-experience-japan.com/images/blog/file/64738577034.pdf
    • http://portaldo.eu/contenuti/upload/file/dodekatepuxikenatomaxa.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/69403588232.pdf
    • http://etcpremium.com/userfiles/files/4318173190.pdf
    • http://dobrasekacka.cz/userfiles/file/munuzepi.pdf
    • https://gencshoworganizasyon.com/upload/ckfinder/files/1272898807.pdf
    • http://yameitecl.com/ckfinder/userfiles/files/20210903_145117.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e2a3.bin
47e79d905506a510978cc10ece5cefc6936ee810eb781523b0a00ee8ef3e3e8a
pdf-font-stream PDF embedded font (sfnt) at offset 0xE2A3 17300 bytes
font_01_sfnt_off00010f21.bin
23904a5bc6ef9585e7079e7dfa51cd8895d60e0f5da444da2ceee558c5720cdd
pdf-font-stream PDF embedded font (sfnt) at offset 0x10F21 10344 bytes
font_02_sfnt_off000126a4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x126A4 16792 bytes