Malicious PDF — malware analysis report

Static analysis result for SHA-256 63c9e2232d8aba51…

MALICIOUS

PDF

74.4 KB Created: 2021-09-04 23:16:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 6ce552b2d2b37357c346d0b3f9fa2ddb SHA-1: 60df0d3c00558717582e2c485367d223a823d279 SHA-256: 63c9e2232d8aba5128daebff60c53e1b7a9e9657603692e4374b8a05dc8da226
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 links, many pointing to compromised CMS upload directories, suggesting it's designed to redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a malicious intent, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://ehblending.com/wp-content/plugins/super-forms/uploads/php/files/3ba425346be8e306d75e20daee8ade51/36714560613.pdf In PDF document text
    • http://ahs1968.com/clients/d/dc/dcea35c349c70fb55dca458fc6558ff6/File/48315605692.pdfIn PDF document text
    • https://swotin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161013200487e9---zidavapined.pdfIn PDF document text
    • http://ingpoggi.eu/userfiles/files/jepiposimibibotusesoraso.pdfIn PDF document text
    • https://tresonance.org/uploadfiles/mesusipuxadanawaz.pdfIn PDF document text
    • http://0930actress.com/files/files/ronubugavaxoxivonubigov.pdfIn PDF document text
    • http://nwatchonline.org/userfiles/file/61977880123.pdfIn PDF document text
    • https://ccaquebec.com/userupload/files/63143547822.pdfIn PDF document text
    • http://fritz-fahrlaender.ch/download/gumubegefasumewomifagugav.pdfIn PDF document text
    • http://www.bash.cl/media/file/neperatiduvavopazodelomuf.pdfIn PDF document text
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ac404b0eb00---xobisuxekigasomodase.pdfIn PDF document text
    • https://www.wikiwebagency.it/wp-content/plugins/super-forms/uploads/php/files/509252344b15eebdcb17d25864bf0b0b/21098705849.pdfIn PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cbb18d99d4---33819569074.pdfIn PDF document text
    • http://pro-elec.ru/ckfinder/userfiles/files/61455919609.pdfIn PDF document text
    • http://angelcabrera.com/FCKfiles/file/13210113214.pdfIn PDF document text
    • http://iltorg.ru/upload/file/roboloxali.pdfIn PDF document text
    • https://happycustomerservice.com/wp-content/plugins/super-forms/uploads/php/files/79e895bb33e55ae5450d87cd67345dca/zunomutogudubasa.pdfIn PDF document text
    • https://adlinefor.com/home/webagen/public_html/korn/data/file/4084703579.pdfIn PDF document text
    • https://bloomeng.com/uploads/52468243611.pdfIn PDF document text
    • https://cosalesrep.com/wp-content/plugins/super-forms/uploads/php/files/a054a0daaf87c06bf7624f4608e92a85/kezijozatalojedimefuvudes.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce8de9914f4---rerimenexerafixaritezep.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606f48c377613---93674769744.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=convert+kindle+for+pc+to+pdf+freePDF 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_off0000c077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC077 10472 bytes
SHA-256: fbf26952f8821750eea8a14a983dcd89b10a2fa5be149dba7dea8345cd950ae0
font_01_sfnt_off0000d865.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD865 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f077.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF077 16784 bytes
SHA-256: 68615a439522ac4c203ad9980fb174350b669993217c0c9b976f10a7cc8915a1

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