Malicious PDF — malware analysis report

Static analysis result for SHA-256 0090c3cd11b66534…

MALICIOUS

PDF

87.1 KB Created: 2021-08-11 06:13:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 5feffd4e5fa0fc3505da65cc23cfbbc2 SHA-1: 613dbf2ebbb59c45c2f92844ac9e12257db25caa SHA-256: 0090c3cd11b66534c540160a9ae2811b3e186f34decc8f93ae46b91b12f5e8d4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection T1204.002 Malicious Link

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, many pointing to compromised WordPress sites, suggesting an attempt to lure users to malicious content. The presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://laborke.ru/uplcv?utm_term=imagenes+de+cumplea%C3%B1os+para+la+madre+de+mis+hijos PDF link annotation
    • https://southtours.com/wp-content/plugins/super-forms/uploads/php/files/33kh9slj75iieo2jucil4kmm67/dodefurujidopofukilaben.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/8340964781.pdfIn PDF document text
    • http://tandprotheses.com/ckfinder/userfiles/files/vusupigajaso.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/zetobufiwi.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/xatar.pdfIn PDF document text
    • https://familienbilstrup.dk/ckfinder/userfiles/files/34497951047.pdfIn PDF document text
    • http://alexandraharris.com/clients/36054/File/10888985329.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/1feu4hmnsu9hjct84h8748cm3h/tiwutukidurakete.pdfIn PDF document text
    • http://business-plan-capalpha.fr/mbp/upload/images/images/upload/ckfinder/zozulalotekubafo.pdfIn PDF document text
    • https://tedvandergulik.nl/userimages/file/nixopatezelafaluxeduk.pdfIn PDF document text
    • http://global-insurance-broker.de/downloads/65063123757.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c850c3049fe---tazapupomuwikax.pdfIn PDF document text
    • https://elegune.net/files/galeria/files/latipuxutefagejesa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/ce1297c019c85a95da5d33d937037794/golidetuwadojowuvutadum.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/2ae0d9754560ca292b09e341acf4557e/vozerupelamomaripafar.pdfIn PDF document text
    • https://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/623c8b210ef49f825f11ba6e3c7cb9fb/rujafakuxaraxegavu.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/a1a2cf0ab3e10904b19f3f22ac17575f/jazisunodowekabebisoduw.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/venibexew.pdfIn PDF document text
    • http://www.anjhimayath.com/upload/file/85293088789.pdfIn PDF document text
    • http://smclassof57.org/clients/34860/File/5674895988.pdfIn PDF document text
    • http://netflor.pl/upload/File/58258892507.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/51851426544.pdfIn PDF document text
    • http://veronicanealhome.com/wp-content/plugins/formcraft/file-upload/server/content/files/2/160e4cc68bb64a---mapuraro.pdfIn PDF document text
    • http://termocity.by/pics/files/84816871315.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_off0000ef13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001072a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1072A 11252 bytes
SHA-256: bcd156cb8406a9a883eeb1c1aec3267526328b4fb91b512ac74c9206e3381d28
font_02_sfnt_off000120bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120BF 16952 bytes
SHA-256: eb52a0d1d8ee638730b04db92d02dd294920c67326baf3360fe864e05a90fca4