Malicious PDF — malware analysis report

Static analysis result for SHA-256 4064a15e2b9a2e5c…

MALICIOUS

PDF

91.1 KB Created: 2021-09-13 07:38:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: dd11375d67efe060af0f8e18063865a0 SHA-1: e773c74a05ed70f818fad611a4a3d3b4c1d034e3 SHA-256: 4064a15e2b9a2e5c538f091d613301e84f4560dfc4e6ae6784943b5c1f5c945b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to various domains, many of which appear to be compromised or disposable hosting, indicative of a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or SEO abuse. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards malicious URL redirection as the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=age+of+empires+2+tower+rush PDF link annotation
    • https://accuratesearch.com/userfiles/file/fugetofefoto.pdfIn PDF document text
    • http://sithome.com/upfiles/file/20210910081955.pdfIn PDF document text
    • http://zdravi-kromeriz.cz/files/file/92945077386.pdfIn PDF document text
    • http://naturpix.ch/cmsimages/file/kamewidepin.pdfIn PDF document text
    • https://signos.larrialdiak.es/files/galeria/files/lafutugow.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/4495111901.pdfIn PDF document text
    • http://bowie.abwingsmd.com/uploads/files/dipozoxotigokutaki.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/kasinavazojikavefulomo.pdfIn PDF document text
    • http://hotelamadeustorino.com/userfiles/files/73228497306.pdfIn PDF document text
    • https://khonggiansachhanoi.vn/uploads/files/pimuxufolusumemitizup.pdfIn PDF document text
    • https://toskov-yordanov.com/userfiles/file/21323112513.pdfIn PDF document text
    • https://encoyun.com/calisma2/files/uploads/99528274938.pdfIn PDF document text
    • http://freemansphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133f86408fb4---xozaparikini.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/13030034924.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613da3d2e253a---79805333680.pdfIn PDF document text
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/422865e94cf004eb3602ace3cc371ad5/91189391152.pdfIn PDF document text
    • https://ekselantechnology.solutions/ckfinder/userfiles/files/70861370611.pdfIn PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/46723302487.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/mozafi.pdfIn PDF document text
    • https://istanajp.net/contents/files/93284814251.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613670f75c9a2---zogoginone.pdfIn PDF document text
    • http://canshu.dlzj.net/upload/files/20210907022356230106.pdfIn PDF document text
    • https://www.getfitcrew.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a2574278b---bexojujofunizi.pdfIn PDF document text
    • http://safarekhoob.ir/basefile/safarekhoobir/files/ponubam.pdfIn PDF document text
    • http://www.vandiestbrandstoffen.be/uploads/files/21675523107.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_off0000ff0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0C 10780 bytes
SHA-256: 57e4d5c5b471784a21e3e397b8d4997c986c12446a45988fab299fc3c137bea5
font_01_sfnt_off00011805.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11805 17836 bytes
SHA-256: 26b728e9f81aaa2a7980f8883838ffaaa902a43816c39245db0d5f6a25512942
font_02_sfnt_off0001465b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1465B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.