Malicious PDF — malware analysis report

Static analysis result for SHA-256 c85287af9f8c85cd…

MALICIOUS

PDF

71.5 KB Created: 2021-09-28 01:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: c64f26e5f1a2c860f91fe8a42715d4f1 SHA-1: 831fdc9f07e12717d56b480322441184e59e39d6 SHA-256: c85287af9f8c85cd0faa07763ca7324fac864b102d0f0f100cd333fe9b9509da
196 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics as malicious, including a ML classifier and ClamAV, indicating it is a phishing or trojan delivery mechanism. The document body is heavily obfuscated, but the presence of embedded URLs and the 'SE_BROWSER_INSTALL_LURE' heuristic strongly suggest the intent is to trick the user into downloading and installing a malicious browser extension or update. The numerous external URLs, many pointing to compromised WordPress sites or disposable hosting, further support this phishing and malware distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9909

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://crewmak.ru/uplcv?utm_term=download+chrome+extension+for+android PDF link annotation
    • http://trevelsi.ru/ckfinder/userfiles/files/94841583173.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/88303190210.pdfIn PDF document text
    • http://www.macrolepidoptera.hu/userfiles/files/damuwi.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210912135205.pdfIn PDF document text
    • https://gymlesgeants.com/upload/editor/file/40770040849.pdfIn PDF document text
    • http://caribsplash.org/wp-content/plugins/formcraft/file-upload/server/content/files/16131842b63a25---94787890831.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/gixuwuruzugupudakovejogeb.pdfIn PDF document text
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/1613c21c27176f---94219428684.pdfIn PDF document text
    • http://tofuyatogo.com/uploads/files/borevapilubupakegazojajub.pdfIn PDF document text
    • https://zevkotodoseme.com/upload/ckfinder/files/92246733145.pdfIn PDF document text
    • http://dar-tom.pl/userfiles/file/kujuvuxomimavut.pdfIn PDF document text
    • https://sme.bankai.lv/ckfinder/userfiles/files/gutidu.pdfIn PDF document text
    • http://ehoron21.mn/uploads/files/fuvusozojak.pdfIn PDF document text
    • http://saint-party.com/media/file/6074651285.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/2gk9epfpo1a9hr52athufsm4t4/vekizumasa.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-6/20210906235954226108.pdfIn PDF document text
    • http://www.gesas.it/media/mailinglist/file/xapuwedosad.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/18683969949.pdfIn PDF document text
    • http://msnladyboy.com/ckfinder/userfiles/files/watik.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16138d5af58bdf---33886422468.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/mumozuzupejifonuluwitepak.pdfIn PDF document text
    • http://mhinflatable.com/upload/file/tuxuxuzuzamivu.pdfIn PDF document text
    • http://nutranghongngoc.com/media/ftp/file/rifuvixopipop.pdfIn PDF document text
    • http://canadianrockies.info/files/file/muxatija.pdfIn PDF document text
    • http://worldcar.jp/userfiles/files/nadupikivajesaxivipuvuz.pdfIn PDF document text
    • http://fabrykakonwersji.pl/wp-content/plugins/super-forms/uploads/php/files/ebcd341babf55144c144f098a0b4e10c/28721353122.pdfIn PDF document text
    • https://onecre.com/images/content/files/nomomefafeboxesasakijaru.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_off0000b698.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB698 10928 bytes
SHA-256: e77090bd74eaa176a44fb249da50f19395b7fe5e0ee038d61bdac6bcd6793909
font_01_sfnt_off0000cfcb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e7dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7DD 15528 bytes
SHA-256: 2a4420b4b5fc676b24ecb51599b0298c3e3067dda2736727b585a0fd1cf66614

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