Malicious PDF — malware analysis report

Static analysis result for SHA-256 88be905b87596f01…

MALICIOUS

PDF

89.2 KB Created: 2021-07-29 14:27:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ddd262f8466d011b98fbc96d70ed8f0b SHA-1: 753af02e0ee82745ebb7f90aafa7c1105a5069db SHA-256: 88be905b87596f01d157eb942e74b800c89703b5834ecb07e1ea16fbd0d402b2
156 Risk Score

Malware Insights

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

The PDF contains a large number of links, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent. No scripts were extracted, and the document body was unreadable, but the heuristic firings and numerous URLs are sufficient evidence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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 http://challendor.com/fckeditor/upload/file/muruzizowik.pdf In PDF document text
    • https://easy2ticket.com/upload/files/74921287688.pdfIn PDF document text
    • https://gbeequestriansurfaces.com/wp-content/plugins/super-forms/uploads/php/files/sa5h3g3l2gnbmbte9fq8upi3lp/22999503174.pdfIn PDF document text
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/032841297de78cbacde9116df39815ba/badake.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160887512ad2fb---46895143819.pdfIn PDF document text
    • http://mkbeauty.vn/luutru/files/muzenojodusozanuf.pdfIn PDF document text
    • https://sf-tfi-pgu.uz/wp-content/plugins/super-forms/uploads/php/files/a79afb7ca3bec30fae8a8b0191f9956f/18570275345.pdfIn PDF document text
    • http://vitalchurchesinstitute.com/files/file/90118922853.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070fa0ccead9---89404064610.pdfIn PDF document text
    • https://www.hit-education.com/wp-content/plugins/super-forms/uploads/php/files/7vs2s92ivlb6bqsfislhj5a0c4/dikib.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160b3e7c54db00---52834020869.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/og2spu3iuk0s4ipl9344sq4vsa/46992293248.pdfIn PDF document text
    • http://grotech.in/userfiles/file/losururajojominimufupa.pdfIn PDF document text
    • https://bczenekar.hu/files/file/7010969507.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2e6d222a1c---16351971230.pdfIn PDF document text
    • https://terminal.hr/userfiles/file/53800551354.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/kqbciqsg4gijolurh09l99oo52/fepefomemadedak.pdfIn PDF document text
    • http://spoilersmensgolfclub.com/clients/865201/File/33050923024.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/lejoxozironisazumekod.pdfIn PDF document text
    • https://defrokatilai.lt/images/files/89969032969.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/160c08b3bdab8a---virusexunusi.pdfIn PDF document text
    • http://call.ae/wp-content/plugins/formcraft/file-upload/server/content/files/160710144d237f---14550703233.pdfIn PDF document text
    • https://livingcircles.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9dceddeaf---vigukawerizukosefozisowap.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088e15b22561---54806505557.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=woman+fashion+croquis+templatePDF link annotation
    • 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_off0000f5bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5BF 17988 bytes
SHA-256: 0410d0e8ff3b967fff8b4068341d55d8c421f3ff1513e727b7eae9eb406e5c6b
font_01_sfnt_off00012486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12486 10984 bytes
SHA-256: 22cc7e4f2770594438a7a0cd3b80056f1588a81f2abd7ad3fc4129d06d25614e
font_02_sfnt_off00013ddb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13DDB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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