Malicious PDF — malware analysis report

Static analysis result for SHA-256 301e864a01d959d5…

MALICIOUS

PDF

83.3 KB Created: 2021-09-21 14:08:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 506f04b6656fa8e75ffd718e403b1645 SHA-1: a5382b30aa20e72c469e91e89829b5025cf138a4 SHA-256: 301e864a01d959d5fd2e581d4837d1d58e8a8989b08be26cec8508f5e793275a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URIs, many of which point to compromised websites or disposable hosting, suggesting a link farm designed to distribute malware or facilitate phishing. The ClamAV detection and ML classifier further support its malicious nature.

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 https://archism.ru/uplcv?utm_term=amazfit+verge+apk+download PDF link annotation
    • http://thingsantiquesla.com/userfiles/files/dixizojuxubuzixijamorige.pdfIn PDF document text
    • http://archiw.gbpopatowiec.pl/img/upload/files/tumajudebapurazap.pdfIn PDF document text
    • https://fivetc.vn/uploads/files/senuvenokopotizodaroxeda.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/kugegilejuwozusux.pdfIn PDF document text
    • http://kemnhapkhau.com/upload/files/wemonodufodo.pdfIn PDF document text
    • https://readxyz.com/wp-content/plugins/super-forms/uploads/php/files/5d2e1f150e9cc14333fa70f90e188c57/13747822363.pdfIn PDF document text
    • http://runhouchem.com/upload/files/kenobagarusovovixosuvarew.pdfIn PDF document text
    • http://goforthegreengolfpools.com/userfiles/file/jifidikogusosu.pdfIn PDF document text
    • http://minerva-collection.net/files/files/2351300164.pdfIn PDF document text
    • http://bkm-market.net/userfiles/file/87973559706.pdfIn PDF document text
    • http://ingatlantv.tv/userfiles/files/99196154652.pdfIn PDF document text
    • http://garagehayashi.com/js/upload/files/51353663929.pdfIn PDF document text
    • http://dbmotorbrokers.com/userfiles/file/41328449686.pdfIn PDF document text
    • https://pannonfinanz.eu/editor_up/49361986343.pdfIn PDF document text
    • https://kantankacreative.com/wp-content/plugins/super-forms/uploads/php/files/3ebbbbd49772fe587089dbccb2f09b1f/32615895623.pdfIn PDF document text
    • http://gemmacapitalgroup.com/foto/file/87390860636.pdfIn PDF document text
    • http://kiuruvedenlukio.fi/tiedostot/file/83282415164.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/16140ce5d8448e---ruzabebe.pdfIn PDF document text
    • https://tatvan.in/userfiles/file/vezigeme.pdfIn PDF document text
    • https://mikludava.lt/images/files/zerilomeja.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/c869d458a527a887831c5ed826d7ee68/bukale.pdfIn PDF document text
    • http://soupworld.de/upload/file/78230464164.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/77274a1494f555559a906733b96e80ce/jerozefodetut.pdfIn PDF document text
    • http://g-shocktou.com/user_file/file/pifunopulaxegawajelojizi.pdfIn PDF document text
    • http://greensquares.in/userfiles/file///wiwegewadojibu.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_off0000df21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF21 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f738.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF738 10960 bytes
SHA-256: 723b372cbda6ee5019b80efbf06a6687b1882c7b2d1a3104ff97afa573e1a9b2
font_02_sfnt_off0001107d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1107D 18336 bytes
SHA-256: b9fe2c4ff5bcebca2470a8be5d6b56c03fd2b20df451c545b225a9b1fcfe31c2

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