Malicious PDF — malware analysis report

Static analysis result for SHA-256 cbc8fb658d32508b…

MALICIOUS

PDF

72.2 KB Created: 2021-09-13 18:10:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9637944ca344ca0b797f1d8c233a8d98 SHA-1: 4a18b6f89f23df3d3fd0ce44d25896c7642a79ba SHA-256: cbc8fb658d32508be2b615cfaa295ce06814b7ed201bbef1f0c70545b562c03f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious document delivery mechanisms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://wastran.ru/uplcv?utm_term=game+gta+android+offline PDF link annotation
    • https://hamasataccessories.com/userfiles/files/petusunizajajafizuralero.pdfIn PDF document text
    • https://petek.biz/resimler/files/tavowamuxudu.pdfIn PDF document text
    • https://activepymes.com/pub/file/40644070820.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c6d693856b---67115343001.pdfIn PDF document text
    • http://jcnjl.com/userfiles/files/18543450647.pdfIn PDF document text
    • https://dancleland.com/img/upload/file/mekuzatosur.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/didulad.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/fogojotoka.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/91741917327.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d922595b31---57244857948.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/161378fc0da537---82870686504.pdfIn PDF document text
    • https://dveropolis.ru/upload_picture/77300669401.pdfIn PDF document text
    • http://www.wiz-fac.com/uploadImg/file/54836288874.pdfIn PDF document text
    • https://enerjimakine.com/tsrm1/img/userfiles/file/kidiwoxuwepapitow.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/qa6gbisou6qffd2dnm4db745qc/nivuzokijebobakufobabojaj.pdfIn PDF document text
    • https://sailstudy.in/ckfinder/userfiles/files/51936280500.pdfIn PDF document text
    • https://event-connections.net/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43a8eafbc---51780022078.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/57359684222.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/sixisoturalofojexagem.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/5ffdfpav8ol3mp5fs0qsdrtqh6/39472101787.pdfIn PDF document text
    • https://treasurehunterdetectors.com/ckfinder/userfiles/files/vinesosinufiz.pdfIn PDF document text
    • https://chupwo.com/editor_upload/file/39572082487.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137377b0bd73---57646417556.pdfIn PDF document text
    • https://speedwayinfo.hu/uploads/file/76892904438.pdfIn PDF document text
    • https://gangwontaxi.com/FileData/ckfinder/files/20210904_069421830FF0EB88.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_off0000b898.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB898 10568 bytes
SHA-256: ab345acea222ea4e69186352a4d31aa1df02fab07a5f6ee6344898c9a8ee3b8a
font_01_sfnt_off0000d077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD077 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 16504 bytes
SHA-256: 4ab4b7c136631f5fb3aef2452de825586d2bd329e1bc9a616cec9433f3331e20