Malicious PDF — malware analysis report

Static analysis result for SHA-256 491c8486bf57738e…

MALICIOUS

PDF

86.8 KB Created: 2021-09-03 02:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 29a9fb4281626597ec77e5c672441b0e SHA-1: 167f53cfcd2d535c21add34a0a7432c3c72764c6 SHA-256: 491c8486bf57738ec13f409a7686a07f0591da6c3a57244ef6f9d7d41c2bb8ca
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs and a link farm structure, suggesting it's designed to redirect users to compromised websites or phishing pages. The presence of external URIs and links to potentially compromised CMS upload storage points towards an attempt to distribute further malicious content or harvest credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://queure.ru/uplcv?utm_term=aneurisma+de+aorta+toracoabdominal+pdf PDF link annotation
    • http://macabrey-luthier.fr/data/Files/lototelisisomifixakaxiwe.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/rasekogoxosanuzikadake.pdfIn PDF document text
    • http://afslab.asia/upload/files/64942944858.pdfIn PDF document text
    • https://masterpieces-mallorca.com/wp-content/plugins/super-forms/uploads/php/files/186a371f2508aba73adca2b89eb12804/woxafugufeze.pdfIn PDF document text
    • http://gattoneva.pl/pages/userfiles/file/gazufodesuxilagaderoni.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/dosawelewarasu.pdfIn PDF document text
    • https://holzhaus-suedtirol.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607418cadba99---panovaluboxab.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/4ngirlcso28djo9nf5877fvaks/niwikolinomafulatolajomo.pdfIn PDF document text
    • https://mygamedaysports.com/wp-content/plugins/super-forms/uploads/php/files/663b35c92d4bbc6d4d203bb717f46469/42199174956.pdfIn PDF document text
    • https://goldengrowers.com/wp-content/plugins/super-forms/uploads/php/files/9a8b694cedafa2bd4d943944d4417446/zesupasigedapa.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/a969318d1f84ab734407b7ba5706a457/75834352558.pdfIn PDF document text
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6335ea3f7d---94116466445.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/91708872990.pdfPDF link annotation
    • https://ancoraeducacion.com/images/giletimu.pdfIn PDF document text
    • http://www.shipsupply.co.mz/wp-content/plugins/formcraft/file-upload/server/content/files/1609b00c885127---welimavetebepovoxopixo.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1606cbc828a74b---81997074690.pdfIn PDF document text
    • https://pensiuneavlasin.ro/wp-content/plugins/super-forms/uploads/php/files/boa178gbob5am28q9kj1d9jees/didanofawonenomopup.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/tozevobova.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160744438ce7c4---83406320868.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/wapudiro.pdfIn PDF document text
    • http://mutamobilya.com/images_upload/files/vapofolase.pdfIn PDF document text
    • http://www.pics4us.de/userfiles/file/94389364639.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/zogubumabozimizazovagemu.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/l9p5jciv672ggki1thops56gt9/98492437549.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_off0000e9a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A3 11000 bytes
SHA-256: 5f7a4e2845bc8b4bcfc6fe034a230df8b4e2c7d0e69143d6a6386b845b66bd97
font_01_sfnt_off000102f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F9 19380 bytes
SHA-256: 6e1105027c587d9d9c42b346ea3b1fb3a34762d752cbc1d34bd0671ffa2f4faf
font_02_sfnt_off00013575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13575 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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