Malicious PDF — malware analysis report

Static analysis result for SHA-256 866bbf68ff0ed689…

MALICIOUS

PDF

83.3 KB Created: 2021-09-22 20:34:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 8c31ecce24a63f1d42d515a908703f03 SHA-1: 33e51eeb0c92947a09a3fae541fa2d962a59b3ac SHA-256: 866bbf68ff0ed68991d8adaaddc0fc2e5599caa8ed9886e51d74f42e35f84d9e
156 Risk Score

Malware Insights

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

The file was identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Multiple URLs point to potentially compromised or disposable hosting, suggesting an attempt to lure users to malicious sites. The PDF's structure and embedded links align with phishing or malware distribution tactics.

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 http://terhautz.com/upload_files/files/kinuvebisinudeseke.pdf In PDF document text
    • http://zuche0551.com/upload/file/17827324243.pdfIn PDF document text
    • http://www.perchegouet.com/ckfinder/userfiles/files/gonizawejizagaw.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16136ee7560bbd---47423450371.pdfIn PDF document text
    • http://ifa-astrologie.de/userfiles/file/48418265119.pdfIn PDF document text
    • http://demo-jesma.shopcloud.es/ckfinder/userfiles/files/wemurawutezetoz.pdfIn PDF document text
    • http://goldenbaycruisesagent.com/userfiles/file/wawinokezi.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/16138ef64ca316---gevepulevovasavexiz.pdfIn PDF document text
    • https://www.ccps.mx/wp-content/plugins/super-forms/uploads/php/files/3a6ad26f600f38ecc18df99599764b16/70526707164.pdfIn PDF document text
    • https://robodom.si/files_vsebine/mesolobixi.pdfIn PDF document text
    • http://descanso.verareyes.com/ckfinder/userfiles/files/wonaxazativumamewajedo.pdfIn PDF document text
    • http://stluciachamber.org/uploadedImages/contentImg/file/bopuleloroxesezun.pdfIn PDF document text
    • http://hongdacable.com/d/files/jabamumovok.pdfIn PDF document text
    • http://nedirajtebosnu.net/userfiles/file/jabadubowuxiregetewuxoko.pdfIn PDF document text
    • http://soc-in.com/data/media/files/midarafuwuxujigoxom.pdfIn PDF document text
    • https://jetaime-shop.com/files/91675299171.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ll9j9rnls3cfi9g2f8146cjol4/85876557751.pdfIn PDF document text
    • http://northcity.rs/slike/files/1355974063.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9ea40f82f---73321536787.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/58883095679.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/kaxirikowa.pdfIn PDF document text
    • http://bukvoznaika.ru/ckfinder/userfiles/files/49797356766.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/fadixowexepen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=android+screen+mirroring+to+pc+without+usb+debuggingPDF 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_off0000df1b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF1B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f72d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF72D 18368 bytes
SHA-256: fca1a1e5a636fe6770d929037ad36faac4aefe5d89bd95da9f9826cc16a122f4
font_02_sfnt_off000125fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125FC 11060 bytes
SHA-256: 5f20181451646e00bfe978ca30429081e7f5457e28becb86e0b233c7ac8615b5

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