Malicious PDF — malware analysis report

Static analysis result for SHA-256 56dc304dd9cb80a0…

MALICIOUS

PDF

82.8 KB Created: 2021-09-01 08:31:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 165c2ab3cda88658c55893a6cd1003d4 SHA-1: c64c7b75e7ac01bbc0d37a5785a3750737897433 SHA-256: 56dc304dd9cb80a00d46ab35b9cc73533accc8b3788c4213285b1e1e4faffac1
156 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous external URIs and is identified as a link farm hosted on potentially compromised WordPress sites. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of multiple links to external sites suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://medvor.ru/uplcv?utm_term=it+essentials+chapter+1+quiz+answers PDF link annotation
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1608292c782978---31068731481.pdfIn PDF document text
    • https://bimstudioinc.com/media/files/88006461570.pdfIn PDF document text
    • http://teaterskolen-efteruddannelsen.dk/ckfinder/userfiles/files/31107913574.pdfIn PDF document text
    • http://humanitool.ru/userfiles/file/bapesibegifid.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/tefofomimonatesagefagum.pdfIn PDF document text
    • http://blissrenewbeauty.com/newerac2c/userfiles/file/71304975002.pdfIn PDF document text
    • http://icmasistemas.com/userfiles/files/7912893156.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/tulagumipimasigewimew.pdfIn PDF document text
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c181bba447f---18509136806.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ee9dfbfdf2---jukimegixuvifunanuwodire.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/begutirazudusumirisegajus.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/7b5c3035193637830e67d7715026b02d/67761578874.pdfIn PDF document text
    • https://bluetact.com/ckfinder/userfiles/files/litufewixatovamazag.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/75785387549.pdfIn PDF document text
    • http://penzionriverside.cz/files/file/24818620700.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/tgt3ruq7pct1h2l0lov5rpdkhe/xomesisukisaduvuzit.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/zafikivozotelerodasidiri.pdfIn PDF document text
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/006f6d2931f2f15bec283686f156d799/zosenepegikiwijoxafita.pdfIn PDF document text
    • http://khachsansapa.vn/webroot/img/files/zukutaki.pdfIn PDF document text
    • https://reparation-mobile.net/userfiles/file/23502475356.pdfIn PDF document text
    • http://www.zopfitravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160be81a46aee9---93300386611.pdfIn PDF document text
    • http://kfnmdg.com/upfolder/e/files/20210601150751.pdfIn PDF document text
    • http://casinodanmarkjackpot.dk/userfiles/file/pafekaveruku.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_off0000ddb5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C7 18076 bytes
SHA-256: 1eaabe7bc9cd77ec76c3ea46cb6d4e45cb62421bfe4c52ea9c838711473dd12a
font_02_sfnt_off000124eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124EB 10744 bytes
SHA-256: 83b8ff9409b0e97ae9b5bc5cfa2dffb58b87fd1cdc6bf22e9fad394c514352f1

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