Malicious PDF — malware analysis report

Static analysis result for SHA-256 9875b814a208bcfb…

MALICIOUS

PDF

80.7 KB Created: 2021-09-13 04:46:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 9f20fd627053d86d9e4f40c7ddb032eb SHA-1: 0f6b64ab45b9dc96307b89f8036844af8c3079a2 SHA-256: 9875b814a208bcfb54d819a1317c70ab41b5e46661afe205638a546c7266a5c4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to various external URLs, some hosted on compromised WordPress sites. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into visiting potentially harmful sites, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=paradesi+tamil+full+movie+hd+1080p PDF link annotation
    • https://hoangnhataudio.vn/media/files/31815077258.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/vazebitezaxixiwudiz.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/hsd5orso3do5g2cjpct3avk6md/43955957135.pdfIn PDF document text
    • http://sztarmedia.hu/_user/file/nedolukex.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136dcd7a3fb7---46299241115.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/siguzajoleroza.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161394b34abd3d---wulomukomosasukorelogiso.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/hs4puku0p7i1q53o8ndgbpupgm/17006404268.pdfIn PDF document text
    • https://floridagreatescape.com/media/file/54640138524.pdfIn PDF document text
    • https://xn--hjrnskadeakademien-mtb.se/userfiles/file/61373285670.pdfIn PDF document text
    • http://appartenvue.net/appart/upload/images/getumovokebipif.pdfIn PDF document text
    • http://www.alex-vasilkov.ru/images/wisdom/file/96347625959.pdfIn PDF document text
    • https://sainaudit.mn/File/vowodesajoze.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/98009762607.pdfIn PDF document text
    • http://acm-medicali.it/userfiles/files/11731065993.pdfIn PDF document text
    • http://qamsar.org/userfiles/files/38354670349.pdfIn PDF document text
    • https://forumhrdbekasi.com/webroot/userfiles/files/malufurovegunidaz.pdfIn PDF document text
    • https://alebusph.centralcms.cloud/galeria/files/93544231174.pdfIn PDF document text
    • https://kirbas.com/img/uploaded/file/nitufevasezitozowi.pdfIn PDF document text
    • http://caudafotografia.com/userfiles/files/78627636572.pdfIn PDF document text
    • http://autoklej.pl/app/webroot/media/files/64989084966.pdfIn PDF document text
    • https://sunwayhk.com/louis/STARKGROUP/ckfinder/userfiles/files/buturisexekilumijavites.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613502c6766f7---61699640441.pdfIn PDF document text
    • http://sushiosushi.com/uploads/files/razofuxazamebenut.pdfIn PDF document text
    • https://alixdemassy.fr/userfiles/file/31940101698.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_off0000d328.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD328 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB3A 18156 bytes
SHA-256: dcec2e00474e94511dc3bda935822318e0f8fdbffbca4763353dee0b6a13edb8
font_02_sfnt_off00011aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AA2 11208 bytes
SHA-256: ffbdbc56e3a0dd83b388c27e7167bda200eca71684dc2691f55e3bf723f5f1de