Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b1c39f89e999994…

MALICIOUS

PDF

74.0 KB Created: 2021-09-01 10:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 5f354675899a0fd98111ee8ae02d310b SHA-1: 89cb982480ee00ef948ce7af33d360332ad5324a SHA-256: 4b1c39f89e9999949a5498b7adb6d2fd92368ebd1c07f082569efb051ba4c5f7
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs that form a link farm, with several pointing to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution scheme. The presence of these links and the overall structure indicate an attempt to direct users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://crysiq.ru/uplcv?utm_term=solve+the+system+using+the+inverse+of+the+coefficient+matrix PDF link annotation
    • https://yenhuy.vn/upload/files/79302595288.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/30768960077.pdfIn PDF document text
    • https://ka-base.no/images_content/file/pinazobubomovo.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/70988920893.pdfIn PDF document text
    • https://heatingboiler.ca/fck_upload/file/fubofejudezite.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/bowug.pdfIn PDF document text
    • http://palakkadtourism.in/ckfinder/userfiles/files/16982049529.pdfIn PDF document text
    • http://italianopizzeria-pg.com/uploads/files/fexosalopofuw.pdfIn PDF document text
    • https://www.tessilgiada.it/wp-content/plugins/formcraft/file-upload/server/content/files/1611f0ffa49b87---jijuzuxozopofumawowoxo.pdfIn PDF document text
    • https://kaisar168.com/contents//files/91538823905.pdfIn PDF document text
    • https://prolocolidodisavio.org/ckfinder/userfiles/files/tuvatutumalewurozubif.pdfIn PDF document text
    • https://ludifrance.fr/userfiles/file/bebanozuvatemovifozexobud.pdfIn PDF document text
    • http://bike-aholic.com/UserFiles/file/38199308873.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/161181fe6aae72---69953425.pdfIn PDF document text
    • http://electrogalicia.com/electrogalicia/recursos/archivos/nefuzuzesavega.pdfIn PDF document text
    • https://feltshoe.com/userfiles/file/bepuwivame.pdfIn PDF document text
    • https://jdlpartnerss.com/userfiles/file/72909961056.pdfIn PDF document text
    • https://www.davinci.dk/wp-content/plugins/formcraft/file-upload/server/content/files/160d297b572691---15868421636.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/2ef908b599d493b339f09a670f037587/kokerawesuva.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec464e55d9---zimifijobokinulubuwopikid.pdfIn PDF document text
    • http://coytex.net//ckfinder/userfiles/files/61869363284.pdfIn PDF document text
    • http://majortaylorride.info/images/uploaded/file/kutogalonenapenoveked.pdfIn PDF document text
    • https://www.accidentinjuryalbuquerque.com/wp-content/plugins/super-forms/uploads/php/files/phn0uejde3rre60bktt1n34fsb/tojebejepalujilavawotofox.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9E6 17516 bytes
SHA-256: d141b97edbbae5aff6e8df0b6ddc1742dc6198e61139da04e473cf2ca803ad01
font_01_sfnt_off0000e7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010008.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10008 11240 bytes
SHA-256: 406071e3f67ed038037cd69fc4dea551bf441cf8cc04fcba85f32f70a82ad4ab

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