Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdaac869d6bf3d86…

MALICIOUS

PDF

102.0 KB Created: 2021-08-24 21:09:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 88795ef8e9d17bba97cb2f11bb195068 SHA-1: 87e53ebed74d66c72f22716743f6ab5d0ce992bb SHA-256: cdaac869d6bf3d863fb42d56ec3bc34fcf373e71368c9f5d821ade2e0567cafb
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous links pointing to compromised WordPress sites and disposable hosting domains, indicating a link farm designed to redirect users to malicious content. The presence of multiple external URIs and link farm heuristics strongly suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9906

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://huntic.ru/uplcv?utm_term=make+our+days+count+ost PDF link annotation
    • http://hotelrefah4ter.ir/basefile/hotelrefah4terir/files/12835928875.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/qsrh9avc0870k1mdtc22ml1u03/56130840419.pdfIn PDF document text
    • https://khotelmarket.com/FileData/ckfinder/files/20210813_711CF034AC361ADD.pdfIn PDF document text
    • https://weinquartier.at/wp-content/plugins/super-forms/uploads/php/files/46812b8ec1229c90931f2ba041d87867/pupizoloruxufopofoxep.pdfIn PDF document text
    • http://perfectthesale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f6544257f86---54797046512.pdfIn PDF document text
    • https://miamivanservice.net/wp-content/plugins/formcraft/file-upload/server/content/files/160c224d82ebd6---8990216242.pdfIn PDF document text
    • http://cartopack.com/Images/file/kekijetogux.pdfIn PDF document text
    • http://tsg-edinstvo.ru/userfiles/file/sulovasozojaxuduso.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/26048721927.pdfIn PDF document text
    • http://lifemartrealestateconnect.com/wp-content/plugins/super-forms/uploads/php/files/sqphrptqjo5skjhiv4g5pmveo5/xamatefubugoxike.pdfIn PDF document text
    • https://mymovingestimate.com/wp-content/plugins/super-forms/uploads/php/files/102d75b58c9969ee3ec1fdabb4e755e7/disotupanodujibifotax.pdfIn PDF document text
    • https://signaturetowerpune.com/wp-content/plugins/super-forms/uploads/php/files/0bse31isqsn2qqckmb00ngsdr5/76571459107.pdfIn PDF document text
    • https://singaporenotarypublic.com/wp-content/plugins/super-forms/uploads/php/files/b812d005e262583f367e895b29b1effb/15639943698.pdfIn PDF document text
    • http://inimtrento.it/userfiles/files/95662612226.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1611572e55f10a---7895427058.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ee6c93e9c86---74600289932.pdfIn PDF document text
    • https://www.opdrrustukalac.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ace2d244df0---rogojawasitidanuvafam.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609f74ed76fc2---39421500219.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/kijuwamonosasoguto.pdfIn PDF document text
    • http://humanlitech.com/files/files/93836308535.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/44117238701.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/xenodedivabamoroti.pdfIn PDF document text
    • http://bienchidan.org/uploads/files/51002798202.pdfIn PDF document text
    • https://realestateconnect.us/wp-content/plugins/super-forms/uploads/php/files/6pvut60ipdhsd8e8rbmja41ic0/11045355155.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106EA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011f01.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F01 10524 bytes
SHA-256: 561b02b53836a8e0910862769f80c940c41a56e1548acc4b48d2841e3d192e45
font_02_sfnt_off00013729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13729 2464 bytes
SHA-256: d3424045cc37e3904d51b6e5109ea901797438b4894b88af0fe99b21560d6ca4
font_03_sfnt_off000141e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141E4 16444 bytes
SHA-256: 36070b98a8e6753b527ad528b889fade7991f37b868401bef5caeb3b987fe28d
font_04_sfnt_off000158a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x158A2 17728 bytes
SHA-256: c7710920a3fffc1e99bf66b89397fc0f7b474991c69c9959cf1c8978351d9108

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