Malicious PDF — malware analysis report

Static analysis result for SHA-256 b80f7609bdf29b22…

MALICIOUS

PDF

91.4 KB Created: 2021-08-01 00:00:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 881674b2bf8afdcbd622c982acbc406c SHA-1: b1fc3737ef76b35ed863d44ea990777efc8d2b59 SHA-256: b80f7609bdf29b229cfde163c69b342df2e00b458b0237f633aae7006a41f5d7
204 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a link farm on disposable hosting and a ML classifier flagging it as malicious. The presence of a 'password-protected archive handoff' lure and a 'visual download button' suggests the document is designed to trick users into downloading a payload. The ClamAV detection further confirms its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=gta+v+apk+%2B+data+android+highly+compressed PDF link annotation
    • https://kuechentreff-schmid.de/wp-content/plugins/super-forms/uploads/php/files/j08ptje9o7bael8l4nrrq28icu/26632146383.pdfIn PDF document text
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/d27d0c6af3ba4dfc6230f98f25f03aed/xanutimimeme.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210621_289F398550C6D1CD.pdfIn PDF document text
    • http://geluidsadviesnederland.nl/ckfinder/userfiles/files/jonopukajuwupamu.pdfIn PDF document text
    • http://kondicionery-ivanteevka.ru/upload_picture/file/56602152482.pdfIn PDF document text
    • http://j-club.eu/userfiles/file/lalaxitepu.pdfIn PDF document text
    • https://99shayari.in/userfiles/files/68009511734.pdfIn PDF document text
    • http://studiotecnicomaglio.it/userfiles/files/64522319941.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/160aa227c4b7b6---42111896789.pdfIn PDF document text
    • https://feniks9.ru/ckfinder/userfiles/files/judovutexat.pdfIn PDF document text
    • https://x-software.cz/data/file/warulabej.pdfIn PDF document text
    • https://iwnta.com/userfiles/file/vazirixokeniliru.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/talejo.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/45374157f259c7d40a0d655bbc804282/takiv.pdfIn PDF document text
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/0ltg8kd602i66qqto230d3h0sm/rajibo.pdfIn PDF document text
    • http://waltonjohnsonfamily.com/clients/870437/File/temab.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/leketokozemiwogelutuzav.pdfIn PDF document text
    • http://www.psstrecno.sk/wp-content/plugins/formcraft/file-upload/server/content/files/160dc182cde17b---79697960390.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/lovenamida.pdfIn PDF document text
    • https://polandpools.com/contents//files/7390620383.pdfIn PDF document text
    • https://atlanticcompact.org/userfiles/files/zukopuzojekezudag.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608244b9bde79---wupamitopalu.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7e0c8dcd6e---95429207753.pdfIn PDF document text
    • http://plusbateria.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab7e0d61b63---jupariwezogixuxujinap.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/jonus.pdfIn PDF document text
    • http://gorillatheory.com/admin/upload/file/ruxat.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_off0000fdcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDCF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E1 17788 bytes
SHA-256: 71a80599933fb2af1f2ead125dc43148938587c58d99eb5e3edba9102782eb6c
font_02_sfnt_off000144ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144EE 11272 bytes
SHA-256: 9e212cbc6731e6652fb1f45c45d695aee924d589a711cc41789dbe5ecb58653c