Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9f53aec103360bf…

MALICIOUS

PDF

84.6 KB Created: 2021-07-19 14:55:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2668b9ef2a92ecc0c875364a534517e7 SHA-1: 6f198d778fbedb66754924bb1c5f28abb586bf10 SHA-256: f9f53aec103360bf9b49e972acb5901640a8e1a29f59c06a7418dfad35bd94ab
156 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. Heuristics identified the document as a link farm, with multiple URLs pointing to compromised CMS uploads and disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and a link farm structure strongly indicates a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9886

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 http://afghansolar.com/userfiles/file/buxaw.pdf In PDF document text
    • http://vinmexindia.com/uploads/mokoxugatebejebaloz.pdfIn PDF document text
    • http://matstravel.ru/userfiles/file/53062098277.pdfIn PDF document text
    • https://alzubidi.com/userfiles/files/24515880635.pdfIn PDF document text
    • http://fluellensoflandreth.com/clients/b/bf/bfbe38bd58d8cb8bd08b82175287e3b3/File/bakisavumugukojevezupi.pdfIn PDF document text
    • http://bezagsecurity.cz/userfiles/varefegili.pdfIn PDF document text
    • https://butchercurnow.com/img/shop//contents/donujoxopigeke.pdfIn PDF document text
    • http://boothbayharborshipyard.com/userfiles/file/lutokune.pdfIn PDF document text
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebee2c056f---piduvejiwudaxubujokugugeg.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/tadidiwulixidinumatutes.pdfIn PDF document text
    • http://www.itbaloch.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607371e81ac1c---tosikalaliregegajevitukep.pdfIn PDF document text
    • http://thucphamchucnangmy.vn/uploads/files/mivof.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16094668feadb6---36133248808.pdfIn PDF document text
    • http://rkmaster.ru/uploads/files/17903480714.pdfIn PDF document text
    • http://okmarin.ru/userfiles/file/89057998317.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/2e6d8c8306d55f0c14482e65bd8d49a4/42970212344.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607adb92dfc47---pizogale.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/430l2fa39hmfffupvv3rdsrlo6/fegotupoganutaxufilifane.pdfIn PDF document text
    • http://aeskulap24h.de/wp-content/plugins/formcraft/file-upload/server/content/files/160a68d1207831---30734038540.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/fubostbuaancv0ppdeabardnse/28841773635.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609876eed88b9---14644440513.pdfIn PDF document text
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606fd8cfe2594---zobukuril.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/1609053b0029da---8611861646.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=hedge+in+bankingPDF 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://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_off0000ecf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF6 17948 bytes
SHA-256: 7817e99014865e3d4c46b2b48e0ad72bab38b801f6b0b8fbd4424377c61c6ef2
font_01_sfnt_off00011c73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C73 10112 bytes
SHA-256: 1d8926c872a375fe87a693c62af25888387dde1c2c9d841c8ef8316469c3ec08
font_02_sfnt_off000132d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1