Malicious PDF — malware analysis report

Static analysis result for SHA-256 73409121277317fa…

MALICIOUS

PDF

96.6 KB Created: 2021-07-04 22:55:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 9a255022967f7d9bdec7ca6e9bc46ff2 SHA-1: b8acf32dc79946b6cae46258eb69b3272907d80f SHA-256: 73409121277317faf02a94dbecfdcc6bdc001248c83efbc88b64a4f93f7e7e21
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs, many of which point to compromised WordPress sites and appear to be part of a link farm. The ML classifier strongly indicated maliciousness, and the structure suggests an attempt to manipulate search engine results or redirect users to potentially harmful content. No scripts were extracted, but the extensive use of external links is a strong indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9806

Heuristics 5

  • 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://garglob.ru/uplcv?utm_term=blue+roan+andalusian PDF link annotation
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607b053a07455---30501194998.pdfIn PDF document text
    • http://kiemtoanhaiphong.vn/upload/files/77060538663.pdfIn PDF document text
    • https://www.web2business.pt/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8944c3c1f---didukivijilubaxelubukali.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/1608fa1b512785---weliporuwiluz.pdfIn PDF document text
    • http://busangh.com/attfile/fckimg/file///20210602212618_999776256.pdfIn PDF document text
    • http://almar-bus.pl/userfiles/file/87481659976.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160734e98197e1---4404181698.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/c2cd8f4952be0c00011f56428edf0895/musibugilujedotozufumi.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1336333c6---dipatobotujiwowoda.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/queoir05qnm0jln3e3k8m1ojak/najaj.pdfIn PDF document text
    • https://kolbandibileklik.com/resimler/files/257795366.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/41e83fc79563b379ac8e28dbe2aca1bc/39001100484.pdfIn PDF document text
    • http://socialbomjesus.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b27792107c1---lodekuzewixibavaxasu.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd48bd33278---bizodadawutirepo.pdfIn PDF document text
    • http://aptchasers.com/FCKeditor/userfiles/file/61954371715.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/ba778d53aedfefb88f3597276b8d0593/27813917617.pdfIn PDF document text
    • https://linoforti.it/file/16364981091.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/ahrj3pj6rj10amoskv9p4bom33/gagiriwidizawunodozulez.pdfIn PDF document text
    • https://samavetpharm.com/userfiles/files/98679831316.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16070ef101c745---nilofizufegikib.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/81487470810.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/2372sbhqahct03sjtv93fjodme/mifit.pdfIn PDF document text
    • http://furkansigorta.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160bf1b8c8d2fd---49989457274.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6060c07fa5---xizuteviruv.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6805628ee6---80412663914.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/e3ddc7444ffce7ce809f56075560c939/35430182778.pdfIn PDF document text
    • https://qualitylightsolutions.com/wp-content/plugins/super-forms/uploads/php/files/61683a4bae67ee58074a295dafe26db8/momanodumazofujidutaf.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_off0001172e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1172E 17880 bytes
SHA-256: 19d83c9537bee23991f396d8e091e23f8723ea52825da755598a872d2e51ce32
font_01_sfnt_off00014608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14608 10296 bytes
SHA-256: 782c449d5fd4b5df995dd240b7b53e199af795341ed0510f07af850a6c445e5e
font_02_sfnt_off00015d4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15D4E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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