Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6bce3cb15dfe6c0…

MALICIOUS

PDF

74.7 KB Created: 2021-09-06 14:34:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 80b97ee35ccdc0a9b85a464639e6432f SHA-1: 100083d1c4517dbd48dacfc09a84d53745a1b699 SHA-256: d6bce3cb15dfe6c0544df5727ba2a782947613c0fd35eb11fada358c504685e2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to distribute malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9939

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://iwnta.com/userfiles/file/nigebelofapana.pdf In PDF document text
    • http://netinflux.net/userfiles/file/17027635178.pdfIn PDF document text
    • http://triatlonbizuterie.cz/sites/default/files/file/38207709505.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/79e3aa69f45960c6b9f2bab7fe754eb8/nekosexawej.pdfIn PDF document text
    • http://beverleyannes.net/home/beverley/public_html/ckfinder/userfiles/files/naserib.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/59633151003.pdfIn PDF document text
    • http://conomiya.com/images/uploadedimages/file/59189068064.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16075af37ccffb---58418151417.pdfIn PDF document text
    • http://duythuc-bearing.vn/uploads/userfiles/file/fipapisovib.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/437971f0733cc2888072a8a2e7f52aad/15402810076.pdfIn PDF document text
    • http://bjsixiang.com/jingkelun/userfiles/files/20210728055114.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160da4902195a3---gefuwebolugos.pdfIn PDF document text
    • http://peaceinsrilanka.lk/userfiles/file/31875106904.pdfIn PDF document text
    • https://moscowfashion.net/content/xuploadimages/file/52468715974.pdfIn PDF document text
    • http://pericosrentcar.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609d5e1db436e---50598952928.pdfIn PDF document text
    • https://advantagelic.com/singhania/downloads/file/58995463218.pdfIn PDF document text
    • http://belst.by/upload/file/28331160673.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/narobodomesifi.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/dksvhl6e15i0ug379geaj3dpf4/zagofusemozim.pdfIn PDF document text
    • https://fietenhaardenenkachels.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160db0932c53d5---mevaxebaxid.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c46d1abf978---71652978278.pdfIn PDF document text
    • http://www.houstonorientalrug.com/ckfinder/userfiles/files/dakukedoges.pdfIn PDF document text
    • http://iwilldoit.ru/uploads/files/files/vemuvaw.pdfIn PDF document text
    • https://www.onestopnaturalstore.ca/wp-content/plugins/super-forms/uploads/php/files/rksf8nl1jc32v3la5pohvglgpl/babevipudexowozaluva.pdfIn PDF document text
    • http://indigobaby.eu/upload/files/xajumiwikijedojafogujemi.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/57260152445.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=linea+de+tiempo+de+la+quimica+organica+pdfPDF 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_off0000c216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC216 10996 bytes
SHA-256: e6d1561cb6a56cd33880ff9a3cdc7b69eeb16eee35f56985bd86bfa2b3f613b6
font_01_sfnt_off0000db07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF319 16660 bytes
SHA-256: 33834780a60941a73a14cb26265df55df084b28bd9cad8ab5f10a4e80645dc8f

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