Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3c239263973e8f9…

MALICIOUS

PDF

114.6 KB Created: 2021-07-02 04:03:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: a7cab4488e43b03a3baea4049c1f9b6f SHA-1: 43cfb520e66cb47ba4e4709527a952086fdbcc3d SHA-256: a3c239263973e8f9ef8dc6f5417b46b4d05574d196831c84a1b3e3e88aebad94
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV heuristic strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The document's structure suggests it's designed to lure users into clicking links that lead to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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 http://cy2hand.com/userfiles/62015238773.pdf In PDF document text
    • http://www.festivalmarrakech.info/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0692d2bfe---65279102150.pdfIn PDF document text
    • https://barrierball.cl/ckfinder/userfiles/files/gegomadedamasuwujofin.pdfIn PDF document text
    • http://trackeg.com/en/wp-content/plugins/formcraft/file-upload/server/content/files/160afb03f2f18e---78066850140.pdfIn PDF document text
    • https://starbox.fr/img/files/57636281134.pdfIn PDF document text
    • http://eduomania.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b298413b30e---55361078699.pdfIn PDF document text
    • https://zzarosiscarampola.it/file/dujubujosidinebol.pdfIn PDF document text
    • https://songhong.info/userfiles/file/66677563294.pdfIn PDF document text
    • http://bobas24.pl/Upload/file/bezatazawed.pdfIn PDF document text
    • https://alenakovalchuk.ru/wp-content/plugins/super-forms/uploads/php/files/365638991c78aedd97ff59ca02a46c82/45287296779.pdfIn PDF document text
    • https://uppersanduskyrotary.com/cms/files/File/pifonulabizojagixajozul.pdfIn PDF document text
    • https://www.charroninc.com/wp-content/plugins/super-forms/uploads/php/files/45f391c340fc211fc2a58b3d7a287cdc/zazesewedipaw.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/fvdaij9soc3tuuomk1dg0he8e6/81562666979.pdfIn PDF document text
    • https://playgametoday.ru/wp-content/plugins/super-forms/uploads/php/files/f11e3585317391960fcf1bbd167d696f/butonibewodixabuxig.pdfIn PDF document text
    • http://viaterrestre.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608dba81a93fa---20112286753.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/79411645137.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/160912a0b2e8ac---nowafavevozel.pdfIn PDF document text
    • http://aven.su/userfiles/file/32497818148.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609bd1920314e---fofoxajepexisix.pdfIn PDF document text
    • http://crediramasrl.it/public/file/68017335593.pdfIn PDF document text
    • https://abicecream.ru/ckfinder/userfiles/files/nanofabaluxaziwi.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bad8fc46900---kukutewogadasakusuluva.pdfIn PDF document text
    • http://imagespa.mx/wp-content/plugins/formcraft/file-upload/server/content/files/160cdc5bc2f705---lotarur.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/204126cb343fc1ef534c686a631dcffe/68399665249.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=female+sith+lordsPDF 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_off0001607a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1607A 17480 bytes
SHA-256: 5fdff3f6e87d8eeaefdaee343b27987b70ca78c0dee4362bfae8975be5889e1d
font_01_sfnt_off00018dbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18DBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001a5d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A5D3 10388 bytes
SHA-256: 0177df711c40157c46735ef1a3b8aa7055ce1044e131af14d83c466e18073cf0

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