Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab33ddde5f5f3ead…

MALICIOUS

PDF

84.3 KB Created: 2021-09-24 01:25:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 25380d30c986c87d7dedfc9e030c20fd SHA-1: 09fe92791d616812c8bb72f1507cdf1bb5fd9057 SHA-256: ab33ddde5f5f3ead8e4a9f852d8ad71c82173623b741c45dd2f52cc29e2f2410
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and is flagged as malicious by ML classifiers and ClamAV. It also exhibits characteristics of a link farm, with numerous URLs pointing to disposable hosting or compromised CMS upload directories. The embedded JavaScript likely facilitates the redirection to these malicious sites, contributing to a phishing or content-luring attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://moskvaznaet.ru/upload/files/duzugapi.pdf In PDF document text
    • http://czpohledavky.cz/userfiles/files/70918577875.pdfIn PDF document text
    • http://att-na.com/upload/savifilitorafitoxemaro.pdfIn PDF document text
    • https://casadko.fr/userfiles/file/22267057503.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/lemebapakipomif.pdfIn PDF document text
    • http://odessawa.com/userfiles/file/vajewitedidiposamewubogos.pdfIn PDF document text
    • http://ilkemymm.com/image/files/5120397605.pdfIn PDF document text
    • http://gold-carsales.com/js/upload/files/fowosunofoxemumenoluju.pdfIn PDF document text
    • http://partner-support.net/user_data/userfiles/files/43914739988.pdfIn PDF document text
    • http://4bx.pl/public/file/90593709597.pdfIn PDF document text
    • http://cecev.com/stockages/files/rurabudupisopakix.pdfIn PDF document text
    • https://www.ideakliniksisli.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c02bf18d29---15470375602.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/53670794759.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/forawubunu.pdfIn PDF document text
    • https://giorgiosantinelli.it/file/89627426395.pdfIn PDF document text
    • http://cloudinfo01.smartevolve.com/images/ckeditor/files/pomove.pdfIn PDF document text
    • http://apple888.vn/luutru/files/5455510801.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/78177026969.pdfIn PDF document text
    • http://www.nbrownies.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614c9bc09bfb6---jegab.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210915_151343.pdfIn PDF document text
    • https://beyondpins.com/calisma2/files/uploads/23122325671.pdfIn PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/ed7274a3bf2639774984871193d0b20a/68914230791.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/jumuziv.pdfIn PDF document text
    • http://neteyes.eu/editor_up/dumexitaniwebota.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=good+mobile+racing+gamesPDF 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_off0000e423.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE423 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC35 17952 bytes
SHA-256: 67e5f17f3c7542584642b834c607a4a245a6ca7910f21999bc967eab7506f9db
font_02_sfnt_off00012ab7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB7 10796 bytes
SHA-256: 81c111e031e91a2dff37ee0387556ef1f7a062ff956449921d0939fd4dcc0a24

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