Malicious PDF — malware analysis report

Static analysis result for SHA-256 22532a901d206e66…

MALICIOUS

PDF

86.6 KB Created: 2021-06-27 04:51:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12ac12d36992b7bd8d043825c3abf09a SHA-1: 1a9be9a234bfa9f1673861c5facc92cd66b6f12d SHA-256: 22532a901d206e667b629f4bd3f626683980082374402cc73973e4cc10ec1c70
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains a link farm hosted on compromised WordPress sites, directing users to potentially malicious PDF files. The presence of numerous distinct hosts and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or disguise the malicious nature of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d15a83718d---26889594278.pdf
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16077c809ad4ec---51430831654.pdf
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609c5245d3041---3189235421.pdf
    • https://99shayari.in/userfiles/files/3952571957.pdf
    • https://iiml-pgpsm.in/ckfinder/uploads/userfiles/files/16712858886.pdf
    • http://traditionsradio.com/wp-content/plugins/super-forms/uploads/php/files/agshpjjl4qqeo9t50ocilphhm0/10223425664.pdf
    • https://egf.tw/test2/images/file/kiwuzekum.pdf
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072b767668de---5204440051.pdf
    • http://www.grupohk.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c76bedbef08---mijotogezugipozux.pdf
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/l4i74m02n6slbaohs0k4tengi5/geginidovud.pdf
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16093d132af9d4---43637707496.pdf
    • http://webcertain.net/contentupload/fckeditorUploads/organization_/file/dufudukarewiwedasa.pdf
    • https://pilotcenter.gr/wp-content/plugins/super-forms/uploads/php/files/ko45km8g3a0j3sqnojucpvg7j8/12514961864.pdf
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1d00ddf470---65990065498.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160926120d439d---78164665900.pdf
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/16098824dd784b---88480254719.pdf
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076249938602---xulasaxigorivofukuwuvi.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ecf9b5025e---xidaka.pdf
    • http://effektfilm.de/files/file/60405150711.pdf
    • https://ctapigroup3.com/contents//files/84649752116.pdf
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160ac325600302---sakogapisi.pdf
    • http://prodesign31.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1609423f77b8ca---mojikuzabenaxiz.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=lateral+cervical+spine+x+ray
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f379.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF379 16792 bytes
font_01_sfnt_off00010b90.bin
3813db0e62eda8250ef3e4a08452ac43782cc9790b0f749aaf688e5c6fdc4245
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B90 10488 bytes
font_02_sfnt_off0001238e.bin
2a1ef00873d0582133ae959f623133582e64ba13fafa7ec2e25cb52eb20df84a
pdf-font-stream PDF embedded font (sfnt) at offset 0x1238E 16188 bytes