Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa69296826be8e2…

MALICIOUS

PDF

70.7 KB Created: 2021-09-14 23:07:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: a304a4d020543c07cde10c7d6ac9a6a3 SHA-1: 52f7ad5106fb48e6e2ce98e7c51aec31f6b2ed0b SHA-256: 3fa69296826be8e26ce6adc66ecdb6b592adb1137e55ff3d4848465e4ca03afa
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that form a link farm, a common tactic for phishing or distributing malware. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to lure users to external sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://archism.ru/uplcv?utm_term=real+followers+apk+2017 PDF link annotation
    • http://9y.bfage.com/upload/files/20210906215446.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/32716482398.pdfIn PDF document text
    • https://panegovernance.com/ourprojects/chowki/UserFiles/file/rakafonepavitefekomu.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/161300a4b54396---72083091096.pdfIn PDF document text
    • http://sanxuatbanthinghiem.org/app/webroot/uploads/files/wejajipazoki.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/mepeperi.pdfIn PDF document text
    • http://bluecreator.biz/ckfinder/userfiles/files/lizefitarewototokepa.pdfIn PDF document text
    • https://vizzzio.ru/wp-content/plugins/super-forms/uploads/php/files/2e49af144a4643c40a0ee1826241c835/temegalimas.pdfIn PDF document text
    • https://vozilasavozacem.rs/files/56759069586.pdfIn PDF document text
    • https://nullemont.fr/nullemont/ckfinder/userfiles/files/49799354973.pdfIn PDF document text
    • https://dsodrecital.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133d56276f44---gonoliv.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/zatemakaperurutomixeriz.pdfIn PDF document text
    • http://dh-life.com/ckfinder/userfiles/files/viximasa.pdfIn PDF document text
    • http://jeugdopdewetenschapsagenda.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16139da30df6b3---83052878377.pdfIn PDF document text
    • http://notar-frings.de/userfiles/file/30176706112.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/70498406540.pdfIn PDF document text
    • http://closehorses.com/userfiles/file/paxeduzujirepu.pdfIn PDF document text
    • https://hoavily.com/uploads/files/fepopoxewadekofi.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/xolulire.pdfIn PDF document text
    • https://www.karenlovelee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613577f8185d6---98669037521.pdfIn PDF document text
    • http://dellalontra.it/userfiles/files/59067506879.pdfIn PDF document text
    • http://kagoshimakojintaxi.com/userfiles/file/7953054415.pdfIn PDF document text
    • https://avukatwebsitesi.trakyasoft.com/upload/files/8973750582.pdfIn PDF document text
    • https://phm.vn/upload/files/wixowiradozuzan.pdfIn PDF document text
    • http://wuxihemei.com/ckfinder/userfiles/files/20210902_173050.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_off0000b363.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB363 16356 bytes
SHA-256: 8e4741fe7ee57e778ae1e8207196d5c0527135d438dc111e2c1b6ac305e0daac
font_01_sfnt_off0000dd10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f527.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF527 10624 bytes
SHA-256: 18c0995fd6552dac61460002b25e5e5c8c0d8e8fdf57dd66ceede9fc9211d328

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