Malicious PDF — malware analysis report

Static analysis result for SHA-256 7aec7092a1902f31…

MALICIOUS

PDF

105.3 KB Created: 2021-06-27 23:01:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 7b5ca6f541378ae4ff05a5ed5494272a SHA-1: a8f4af09d1dc917a0c87084afa90f25be24e2ebe SHA-256: 7aec7092a1902f317766dc04ba77323bdaca8281fa74c9577007048fb11fa792
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised WordPress sites and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the nature of the embedded links and the heuristic firings point towards an attempt to exploit users via external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

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://crysiq.ru/uplcv?utm_term=pure+russian+nudism PDF link annotation
    • http://www.heksan.com.pl/file/wokewomu.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bbbbc8082e1---tujakilevajonavipen.pdfIn PDF document text
    • http://staging.impactredevelopment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608303291cc5c---45118540456.pdfIn PDF document text
    • https://lawrenceyezersky.com/userfiles/file/bapinexamudu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098034ea347d---14816718130.pdfIn PDF document text
    • http://sieuthicayxanh.vn/webroot/img/files/natipaxelexoxepugofofasu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/0a790e77c8fe16512f367b2fc177af4e/66382838334.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160acfac3eec15---40307839782.pdfIn PDF document text
    • http://www.uppld.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a248a1d5ee1---bosotifisekok.pdfIn PDF document text
    • http://antiochhighclassof70.com/clients/4/4a/4a4d67c83f6236388cbe8d22d68d4f91/File/dipabuxijimorizubinitoriw.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/80741209867.pdfIn PDF document text
    • http://www.sensible-seeds-premium.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a0ea26ee825---purizozodararepixodewez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7c770de9ee---wajagobadokakawiv.pdfIn PDF document text
    • https://ivaco.it/file/44360865125.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/220b59a45b4b4efe5417c89c73093a10/9909012116.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/kqgsmtm0l37cnabosr5ckc4ti2/miselolow.pdfIn PDF document text
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087070882400---nimasewuxibowitulinabomar.pdfIn PDF document text
    • http://brandnewgoods.net/userfiles/file/rofizepa.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f4112ec10d---negiwapezukaxof.pdfIn PDF document text
    • http://swaminarayangm.org/userfiles/file/xaxenexuwadelurewowos.pdfIn PDF document text
    • https://caribemed.com/userfiles/file/diwesifovegunopipadovap.pdfIn PDF document text
    • http://gibson100.com/clients/870224/File/33131993459.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_off0000ec26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC26 10248 bytes
SHA-256: 97da2a8ae433fdfb0e3ddea2d8a7434d76024664bae68c45023eb015efc735bf
font_01_sfnt_off00010318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10318 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B29 16164 bytes
SHA-256: fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
font_03_sfnt_off0001309b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1309B 17400 bytes
SHA-256: d43bd93af967a2ba9e14bea9520e865591ccf23f43868b4545eed452888f4a0d
font_04_sfnt_off00015e17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E17 18112 bytes
SHA-256: e98ef64999f9e07374f367e7c44c4cea59dcd05955fada3d649b0a41d14b3ef4

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