Malicious PDF — malware analysis report

Static analysis result for SHA-256 02f02ef7caf5b88c…

MALICIOUS

PDF

75.0 KB Created: 2021-09-18 05:21:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e3728f3efa7dba5fc54cd8b9b936876a SHA-1: eb1f855bb9f42866b4c0592a112a547683d53996 SHA-256: 02f02ef7caf5b88cbeaf25aaa67c60a787dcf353e8310a419bf48c4d48baf0c8
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to compromised websites. The primary URL suggests a lure for downloading a driver, but the overall structure indicates a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://allytemp.ru/uplcv?utm_term=adb+driver+64+bit+download PDF link annotation
    • http://stadion-zarya.ru/ckfinder/userfiles/files/runanudemapal.pdfIn PDF document text
    • http://alumcity.ru/userfiles/file/ragenetabekesevakoxoduma.pdfIn PDF document text
    • https://gancza-yacht.pl/userfiles/file/tajaxuwofoza.pdfIn PDF document text
    • http://lakshimi-kaatsu.com/user_data/packages/default/imgfiles/rilabomexobid.pdfIn PDF document text
    • http://uniradioweb.info/userfiles/file/5697217376.pdfIn PDF document text
    • http://escritacontabilidade.net/fotos/news/file/45318082493.pdfIn PDF document text
    • https://www.andyselfstorage.co.uk/wp-content/plugins/super-forms/uploads/php/files/5o77u5uiek6v0q5pnnpcgbhip6/joverifuvijanodenawak.pdfIn PDF document text
    • http://carzip.biz/files/uploads/files/45696899217.pdfIn PDF document text
    • http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613504e4a945e---90210936691.pdfIn PDF document text
    • http://luijkzonwering.nl/image/file/63178785174.pdfIn PDF document text
    • http://www.birapart.com/wp-content/plugins/formcraft/file-upload/server/content/files/161402befc6fd7---53532896702.pdfIn PDF document text
    • http://magyaringatlanadatbazis.hu/dev/_user/file/65569213284.pdfIn PDF document text
    • http://evrofurnitura.by/elax-furnitura.ru/uploads/files/28507157172.pdfIn PDF document text
    • https://triatlonshop.cz/userfiles/file/zufewomibajowed.pdfIn PDF document text
    • http://gptools.net/userfiles/file/zobexivegoridasa.pdfIn PDF document text
    • http://langmoon.jp/js/upload/files/xojibemewekasazepakowexo.pdfIn PDF document text
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/103431325.pdfIn PDF document text
    • http://delfosventures.net/userfiles/files/vulijokaluxosobakaru.pdfIn PDF document text
    • https://lyna-garage.com/htdocs/cljr/data/files/fatukapatole.pdfIn PDF document text
    • https://maintogelonline.bet/contents/files/62822742077.pdfIn PDF document text
    • http://studioguagnoni.it/userfiles/files/40931020382.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/81931175530.pdfIn PDF document text
    • https://inprovitpuertorico.com/ckfinder/userfiles/files/dagoruwasizig.pdfIn PDF document text
    • http://becucci.it/userfiles/files/pujotesuzugelowufupiv.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_off0000c321.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC321 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000db38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB38 10592 bytes
SHA-256: 888398539784c720ef2e6037df8abfec8d4aede809fb5c6b246bb8efcce4e0ff
font_02_sfnt_off0000f399.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF399 16716 bytes
SHA-256: 30a19da26e9d52943c5943e00c947d5dcd8da11c9c12bf594f9e14d71e1aefec

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