Malicious PDF — malware analysis report

Static analysis result for SHA-256 a09aee9dd15b18cf…

MALICIOUS

PDF

68.9 KB Created: 2021-10-01 12:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 6363359ccf3b5c97fd641de82723db02 SHA-1: 114ad88b98c84f7fd635c674bdb1f16ef4555ad0 SHA-256: a09aee9dd15b18cf9bba0a9e55fdc099bb845b959ec41d53f82389c8f9967b42
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 websites or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The presence of multiple external URIs and link farm heuristics supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://euro-m.si/web/dokumenti/file/funaxinevana.pdf In PDF document text
    • https://aadhaarretail.com/administrator/imagetemp/file/28532755039.pdfIn PDF document text
    • https://eliteswimmingpoolsinc.com/wp-content/plugins/super-forms/uploads/php/files/tsums7b7plv7u3s8rrp0vhofk2/47098129672.pdfIn PDF document text
    • https://xn--interpeas-r6a.es/upload/files/59091052911.pdfIn PDF document text
    • http://seamcc.com/UserFiles/files/fuwosexu.pdfIn PDF document text
    • http://nutronicltd.com/userfiles/file/zawukogusamozegumovo.pdfIn PDF document text
    • http://vdgairconditioning.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614e08609f354---91108035952.pdfIn PDF document text
    • http://studiobaldizzone.com/userfiles/files/vixoxefesagevom.pdfIn PDF document text
    • http://ebd.su/UFD/7623/files/siwiwo.pdfIn PDF document text
    • http://lse.hu/userfiles/file/35785837444.pdfIn PDF document text
    • http://relaxzenter.com/uploads/files/guzumaregowiko.pdfIn PDF document text
    • https://ladangmimpi2.com/contents/files/kifajuzetosokipesu.pdfIn PDF document text
    • https://www.bountyvacation.com/wp-content/plugins/formcraft/file-upload/server/content/files/161471a8f49abb---raxuraworawuvedawa.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/25848723570.pdfIn PDF document text
    • http://exhibitionchannel.com/upload/67170948305.pdfIn PDF document text
    • http://bsbcarpet.com/userfiles/file/16280804720.pdfIn PDF document text
    • http://kubak-ubezpieczenia.pl/userfiles/file/82596644130.pdfIn PDF document text
    • http://weilandensemble.nl/ckfinder/userfiles/files/dinab.pdfIn PDF document text
    • https://lanhcongnghiepthinhphat.com/upload/files/sujesibitujedudaxunivosav.pdfIn PDF document text
    • https://netiko.ge/img/Data/file/jetejavizerarilipuro.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/didawolememimevad.pdfIn PDF document text
    • http://deepakbatteries.com/uploads/file/26467280272.pdfIn PDF document text
    • https://www.modianodesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4eb557c2---valojiva.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=minecraft+java+edition+for+android+download+freePDF 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_off0000af07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF07 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c71e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC71E 10576 bytes
SHA-256: dff17f83f592512352a2cf7a6671ee019fb37571736bf7ff96a977c78e44347d
font_02_sfnt_off0000df62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF62 15228 bytes
SHA-256: e92b7ac542da0dc4882596f9ad9e938d346c7ace1d5c27830408e16b256b7cdf