Malicious PDF — malware analysis report

Static analysis result for SHA-256 c8d87efe9023f9c7…

MALICIOUS

PDF

85.9 KB Created: 2021-09-18 10:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 77c74d0bcb5de69e29f37b44e630d8e0 SHA-1: c039f0e9f9fab7dc579ae363a15878d579556927 SHA-256: c8d87efe9023f9c77f06f9d58247bf100dad28e32f53f182256442efd684d5d3
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO poisoning. No scripts were extracted, but the primary attack vector appears to be directing users to external malicious content.

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://pistant.ru/uplcv?utm_term=how+to+create+shortcut+on+android+home+screen PDF link annotation
    • http://resortcrimea.com/ckfinder/userfiles/files/lanevetudupotomipebi.pdfIn PDF document text
    • http://rem-stroymont.ru/img/file/zepodugu.pdfIn PDF document text
    • http://mnwebdesign.dk/userfiles/file/24272810045.pdfIn PDF document text
    • http://raffaelecavazzoni.com/userfiles/files/32112789524.pdfIn PDF document text
    • http://yilip.net/userData/board/file/24133435447.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/xodiwoxa.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/detid.pdfIn PDF document text
    • http://kartelabasligi.com/images_upload/files/wazuselipok.pdfIn PDF document text
    • http://retailcop.ca/files/pejubokoxigivanobamumuj.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1613bd1ca47667---maxexowidelurixo.pdfIn PDF document text
    • http://firewheels.pe/userfiles/file/deboxuzozagifisib.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/36829245237.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/rimabapo.pdfIn PDF document text
    • http://fine-cottage.ru/userfiles/files/vuvogubudotamipeve.pdfIn PDF document text
    • http://assytekservizi.com/userfiles/files/88552114125.pdfIn PDF document text
    • http://www.fishandcosolicitors.com/uploads/files/24646268113.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/673ca24af8767623473def6559c10e6c/66545279351.pdfIn PDF document text
    • http://goldendazzle.com/upload/quangtri/files/64573193745.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e8e34d2d39---dugasokefitalixaporizobi.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161433d25436e9---91317618696.pdfIn PDF document text
    • http://hillsdalehorseboarding.com/ckfinder/userfiles/files/jezof.pdfIn PDF document text
    • http://denda.co.kr/ckfinder/userfiles/files/punaxosiz.pdfIn PDF document text
    • http://solee56.com/ckfinder/userfiles/files/dixaz.pdfIn PDF document text
    • https://agriturismoilcolle.org/userfiles/file/pagozadinosiz.pdfIn PDF document text
    • http://fecirturizm.com/resimler/files/bekojofoluvidef.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_off0000eb91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB91 10764 bytes
SHA-256: a22df5c652f4c1564fd107d3235c1a87e6c1a3fdf5764dd70f50c8f1e0f2da20
font_01_sfnt_off00010426.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10426 17156 bytes
SHA-256: ec3137c5d7ef09a3613fc1fc93546c4f39f11e2a8aeda6a24dac0c05217b70e7
font_02_sfnt_off00013150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13150 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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