Malicious PDF — malware analysis report

Static analysis result for SHA-256 aea4c5f09f0815e2…

MALICIOUS

PDF

80.9 KB Created: 2021-09-21 05:23:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 14520c02c31b4d1430756a2558620ee5 SHA-1: e7934c977ee9cc6a48d6d3f0786fe4b352046923 SHA-256: aea4c5f09f0815e2e9029db1fbdddfeabcfd44388fe193347557da34dc586d61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, including one that appears to be a lure for downloading an Android application. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. The presence of JavaScript suggests an attempt to execute code within the PDF viewer.

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://infrive.ru/uplcv?utm_term=watch+dogs+apk+for+android PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613c8072700f6---xokefimopenebawazox.pdfIn PDF document text
    • http://casadiriposomarsala.it/userfiles/files/16696682444.pdfIn PDF document text
    • https://kakakmanis.com/contents/files/rewifavubisinuv.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/161430cd2dbd3c---88441790526.pdfIn PDF document text
    • https://coachtourbusrental.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613815fa6629d---32677579224.pdfIn PDF document text
    • https://dunakanyarfesto.hu/ckfinder/userfiles/files/degogifofapikelefefovu.pdfIn PDF document text
    • http://wabasnb.com/files/fckeditor/file/1840171546613ba14838dea.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/bn2rhaeqimjknv0en8amh72g68/litizadedof.pdfIn PDF document text
    • https://noble-worldwide.com/wp-content/plugins/super-forms/uploads/php/files/7432f0e0bfb0f945e6f70c63b51df1a2/61469632236.pdfIn PDF document text
    • https://mayphotocopydogia.com/upload/files/wowowikenusoju.pdfIn PDF document text
    • http://fnathservices.com/upload/file/17685269233.pdfIn PDF document text
    • http://laboratoriodiprogettazione-ve.it/userfiles/files/23166473148.pdfIn PDF document text
    • http://haiqi-machine.com/d/files/86106839914.pdfIn PDF document text
    • http://sasmedm.com/www/js/ckfinder/userfiles/files/boxifasukebuwasupugadobi.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/42887331563.pdfIn PDF document text
    • https://siahotel.com/userfiles/files/32030375883.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f95d479ec3---towofekozikejarelomitar.pdfIn PDF document text
    • https://akemi.ro/hirek/file/36402108827.pdfIn PDF document text
    • https://serpavenger.com/ckfinder/userfiles/files/59652768599.pdfIn PDF document text
    • https://ytdrive.com/CKEdit/upload/files/wodepo.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/61571825257.pdfIn PDF document text
    • http://belniig.by/public/file/juwowumadirapezakobefifiw.pdfIn PDF document text
    • https://nacituran.com/userfiles/file/madefutuzazulejejiv.pdfIn PDF document text
    • http://forum-auto.ru/data/files/xunefinapu.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_off0000d85c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85C 17564 bytes
SHA-256: 1284f9cc32ec1150f27c58c58b54d14dae12710ff9c05bfe1558197ccf0e1e47
font_01_sfnt_off00010513.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10513 10804 bytes
SHA-256: ac1de193e730ffb681c31eaecf1349371af0c1d57cfa3d2d45897a26fef3effb
font_02_sfnt_off00011dca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DCA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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