Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87a16d6c13b622e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-09 06:34:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 31492c56a0324d58ee2776782b3a790a SHA-1: 3cff90c1638b90cee874d805b03abb178115fcef SHA-256: e87a16d6c13b622e02d423f3fe15eba8de2c3fdb99b83df61bb9bcdb21eb9dab
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads. The primary purpose appears to be directing users to external resources, potentially for phishing or malware distribution, though no specific payload or exploit was directly observed within the document body itself.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://mail.teleserviciomalaga.com/ckfinder/userfiles/files/34375104609.pdf In PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396bee4c2a2---59205649270.pdfIn PDF document text
    • https://zivotzaokny.eu/res/file/datuwiveravazitowit.pdfIn PDF document text
    • http://nitecoreromania.ro/files/file/80066312479.pdfIn PDF document text
    • https://medbillings.us/lightspeedweb1/file/44991048627.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d390fdfa3fd6d8a44b307530e045507d/surutisa.pdfIn PDF document text
    • https://worldkelo.com/wp-content/plugins/super-forms/uploads/php/files/37804e960bd045406e360005fa903895/sugonebikupasiweda.pdfIn PDF document text
    • https://himalayanwanderer.com/himalayan/userfiles/files/lamaxajafebafife.pdfIn PDF document text
    • http://cabini.it/userfiles/files/34548301201.pdfIn PDF document text
    • https://purevdavaa.mn/uploads/ckfinder/files/45108154991.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/69386040837.pdfIn PDF document text
    • http://asupuro.com/user_data/image/file/vakapijozuduledufudu.pdfIn PDF document text
    • http://smsgurugram.com/miet/assets/files/rabejogenanodorasebavamo.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/famamirebolejabib.pdfIn PDF document text
    • https://irastuff.com/admin/ckfinder/uploads/files/xubinurexozixijefaxubum.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/4720656378.pdfIn PDF document text
    • http://airmon.hu/images/files/kebixubotomaxaw.pdfIn PDF document text
    • http://angelojrobles.com/admin_initial_test/userfiles/file/makafajaluwawukapoz.pdfIn PDF document text
    • https://nomaquito-travel.com/editor-images/92365822088.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/sijapanose.pdfIn PDF document text
    • https://instalacje-elektryczne.net/ckfinder/userfiles/files/73930724518.pdfIn PDF document text
    • http://woodwork.pl/ubezpiecz/obrazy/file/42543003201.pdfIn PDF document text
    • http://www.realisthotel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161367c58ce2b0---44800641097.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/14507027380.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/161361c6833944---mofepadotofegur.pdfIn PDF document text
    • http://alfatreyd-mebel.ru/archive/images/file/sagutamakij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=do+refrigerators+need+to+be+transported+uprightPDF 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_off0000f1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1A5 10972 bytes
SHA-256: d3c143b0a09f4798994dccd55d0f908101009c393b109a5c22ab69a10286a487
font_01_sfnt_off00010a9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A9C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000122ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122AE 16888 bytes
SHA-256: 72ee7da733803605a890578ee4fe225d9e690a0f51f86dd9387da7c58e72ef7d

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