Malicious PDF — malware analysis report

Static analysis result for SHA-256 8abea563cdfa1a40…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 01:01:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 41982487665a4efb8d5edf42213e689d SHA-1: c607e3a48efef2e0fbaac203831fc4dfd84a8496 SHA-256: 8abea563cdfa1a406fc1984258282008ba84d6366ce6e6b71cf387b6e97106cd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. It also features numerous external URLs, including one pointing to a compromised WordPress upload directory, suggesting a redirection or download mechanism. The ClamAV detection and ML classifier further confirm its malicious nature, likely related to phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://krisoc.ru/uplcv?utm_term=offline+golf+game+for+android PDF link annotation
    • http://www.zaluziemalina.cz/userfiles/file/pebomuzatosezimede.pdfIn PDF document text
    • http://dubilex.com/userfiles/files/gadimaru.pdfIn PDF document text
    • http://kortennis.co.kr/B/ck/ckfinder/userfiles/files/kuwalejivadidiwu.pdfIn PDF document text
    • http://phatnang.com/media/ftp/file/28738066830.pdfIn PDF document text
    • http://ingenermarket.ru/userfiles/88092987306.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/zutejilipavobofitowato.pdfIn PDF document text
    • https://estduquebec.com/scripts/php/xenocode/lib/ckfinder/userfiles/files/tokozoteluvezufoporuf.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/sefixa.pdfIn PDF document text
    • http://fence-alarm.com/userfiles/files/zedudumoxujipuwomax.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/tokeletojilakon.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/633lq7vkjskff1ltuu65usm6dk/joruvomokigazowof.pdfIn PDF document text
    • https://tatsolarlight.com/uploads/files/tenemebolibexefemufowod.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/xajiburunij.pdfIn PDF document text
    • http://unipell.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614595775be48---17178282035.pdfIn PDF document text
    • https://www.acta-mobilier.fr/ckfinder/userfiles/files/fidabim.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/potolavawukupulati.pdfIn PDF document text
    • https://khonggiansangtao.com/platformecom/img/upload/file/rajesitotiwage.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/5b9a50fc1cf8f7dcf952fb9bc83f59ff/gerulotuxawikolupifuka.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/nuverokarobivux.pdfIn PDF document text
    • https://alkathirilaw.com/userfiles/files/sesozubosadokiv.pdfIn PDF document text
    • http://musclecar-taps.com/js/upload/files/78296884665.pdfIn PDF document text
    • http://graficaeformazione.it/userfiles/file/27935402851.pdfIn PDF document text
    • http://redeyeldn.com/userfiles/file/woberamokesilagurureku.pdfIn PDF document text
    • http://cluster006.ovh.net/~greeters/be/ckfinder/userfiles/files/91862692476.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_off0000b00d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB00D 10456 bytes
SHA-256: fbd98ac4ea4b7b2273444a975c34221facbee80a79398a4ca93339607167f959
font_01_sfnt_off0000c778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC778 15444 bytes
SHA-256: b9efcb84ae58e6e3fc8a6417ca15c57f2e59c9259ffe3d38d6839c7799e6a52c
font_02_sfnt_off0000eef0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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