Malicious PDF — malware analysis report

Static analysis result for SHA-256 145e1317a5bd0b3a…

MALICIOUS

PDF

88.9 KB Created: 2021-09-04 21:17:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: c091dbe4d9bf5df708892c4e19b26085 SHA-1: 4c036556f51e03bdcf18a26a7a010acc750c4fda SHA-256: 145e1317a5bd0b3a625a2b2f6f97374c6a910d5aeeb35dc4040d7d1c47d9cd91
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many pointing to compromised WordPress sites, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to malicious sites or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://wastran.ru/uplcv?utm_term=cycleops+smart+trainer+manual PDF link annotation
    • http://autostyle-japan.com/js/upload/files/57548115870.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f49d1036a7---88545383322.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c2811199090---32301163097.pdfIn PDF document text
    • https://floorco.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/1db06c89c47846d8eb28f3dffbb4b89f/87533930722.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/63909614090.pdfIn PDF document text
    • http://themultifold.com/wp-content/plugins/super-forms/uploads/php/files/83320hk8l7jjnvpeihaaur1dr3/luvisawopuzutetotowebu.pdfIn PDF document text
    • http://grandfiltr.com/files/file/vabuzaserin.pdfIn PDF document text
    • http://kimwendelldesign.com/ckfinder/userfiles/files/92538493391.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/8fa3901e03cc39676a16eee3bbf2871f/gukanupulozesefexopiwexo.pdfIn PDF document text
    • http://sowitech.vn/upload/files/36290698746.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/jm2bqeivv8li8jrjsktipmt0l0/lonujuwilufod.pdfIn PDF document text
    • https://eatorhours.org/e-bussiness/fckimages/file/wazokutimatujod.pdfIn PDF document text
    • http://www.molinoag.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081ec82cd7d0---jonukamuvajaluzilebobi.pdfIn PDF document text
    • https://jetzterstrecht.hamburg/wp-content/plugins/super-forms/uploads/php/files/a0aou52o86hnogs5ncn1fkhbl7/tafosaxununezavinuluzofu.pdfIn PDF document text
    • https://www.lamuccacompany.com/wp-content/plugins/super-forms/uploads/php/files/7be973d5e024593e74d50118f03146b9/96050032817.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/40985296294.pdfIn PDF document text
    • http://giftboxvietthuy.com/upload/ck/files/6312762554.pdfIn PDF document text
    • http://ezibra.pl/upload//file/64640700983.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083655869798---13018421355.pdfIn PDF document text
    • https://www.potterycommercials.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16093a245ab042---mametebodonofuvebek.pdfIn PDF document text
    • https://venusnvs.com/userfiles/file/3378826361.pdfIn PDF document text
    • https://cplastik.com/data/cms/file/fegefukulofo.pdfIn PDF document text
    • https://www.plsok.com/wp-content/plugins/super-forms/uploads/php/files/7cd435d9d8cef6c01abe1b3a0efe35df/pupaboguriwarifi.pdfIn PDF document text
    • https://camile.vn/wp-content/plugins/super-forms/uploads/php/files/dk87uf65qqj4lgsljjhi9jh274/16752249203.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_off0000f645.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF645 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010e57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E57 18008 bytes
SHA-256: 4a49227bd506e3310617b32733ee7cae37fa2aa293e9f531d0b4c372951ca4f4
font_02_sfnt_off00013d25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D25 10780 bytes
SHA-256: 55ad655ffe2bbf9994a456862017f6965c57db7bbba2d79d95914cde3c9c7c92