Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fe3a3f1d0cb41a3…

MALICIOUS

PDF

88.2 KB Created: 2021-06-28 12:49:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: ae13e3c21ee3e72cd9ce011da99b25ba SHA-1: a70753fdb4a2855c6bc4907c651a7dfca8c5ebca SHA-256: 3fe3a3f1d0cb41a33c2e69cc483bc7235c844e28806fffbe06d5dfc204f5e984
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous links, many pointing to compromised CMS uploads and disposable domains, suggesting a phishing or malware distribution lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing campaign aiming to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://coretry.ru/uplcv?utm_term=download+story+saver+for+instagram+ios PDF link annotation
    • http://www.bandungmesin.com/file/59963066811.pdfIn PDF document text
    • http://agiusfuneraldirectors.com/files/file/niluwevajalunokojola.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/21718421378.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c328b06462f---kenametakupefulimu.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/5t04k988i0mfckjtm68dglimd0/pujiwarovidesuf.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082cd460dfc8---nenalawi.pdfIn PDF document text
    • http://aksaaydinlatma.com/img/editor/image/file/zawosikanawukupodewemasi.pdfIn PDF document text
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1609ed3c7e542c---40272239361.pdfIn PDF document text
    • http://midiabyz.com/wp-content/plugins/super-forms/uploads/php/files/8207b7bea297add86ff478eddb4f73b3/76087670263.pdfIn PDF document text
    • http://cosmic-kino.ru/sadm_files/57597545683.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/obi6ubtrv4v1it4na0m59kkif4/lesegu.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/4rvjomkr2ip6i1e82aco8nt7ui/mawunudu.pdfIn PDF document text
    • http://dioceseofniranam.org/userfiles/file/68405601320.pdfIn PDF document text
    • http://www.maderas-navarro.com/ckfinder/userfiles/files/44874118304.pdfIn PDF document text
    • http://hamdard.com/hamdard/app/webroot/img/ckfinder/userfiles/files/28534042051.pdfIn PDF document text
    • http://spoanalyze.com/wp-content/plugins/super-forms/uploads/php/files/3109f5cca7477313919be731413e9fff/68073190838.pdfIn PDF document text
    • http://netmutum.com/userfiles/file/77363914032.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160910a9038f9d---24908983884.pdfIn PDF document text
    • https://mvservice.it/file/tadelasikepodizefalilap.pdfIn PDF document text
    • http://skup-laptopow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608669b938604---nabakonora.pdfIn PDF document text
    • https://hssipm.com/wp-content/plugins/super-forms/uploads/php/files/9be3743e2a96114305e5a548f0c5bc5d/79141714047.pdfIn PDF document text
    • https://lescourailleurs.com/upload/editor/file/dimabonijumerojawosijibap.pdfIn PDF document text
    • https://aedwea.com/upload/foto/82839903572.pdfIn PDF document text
    • http://sva-jeanroze.com/xmedia/file/ronunekuvopuwum.pdfIn PDF document text
    • http://vienhung.com/webroot/img/files/detonopakojevebapirinixu.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_off0000f431.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF431 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010c48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C48 10964 bytes
SHA-256: ad7ec076615dcc702cc8dbc503a5a48a1d3efadfe8e1e9609181e473b3b4cb71
font_02_sfnt_off00012593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12593 16792 bytes
SHA-256: 28fdb94a803afe646d1fc943ca07250174eed2d42f9e56167372d0a3fbead2a2

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