Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1c748d09a947974…

MALICIOUS

PDF

81.1 KB Created: 2021-08-28 16:52:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: c1d0f733145f0995165931ebcca03e19 SHA-1: 3cc441efce3d160c8f29f36b69253f4a5e8884be SHA-256: a1c748d09a94797489fad9c0b640d23f0e798b0e88c0df1311f654caba70d71b
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document exhibits characteristics of a link farm, with numerous embedded URLs pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier strongly indicated maliciousness, and the presence of multiple PDF-specific heuristics related to URI and link farms supports this assessment. While no scripts were directly extracted, the structure suggests an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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://medvor.ru/uplcv?utm_term=frost+mage+shadowlands+rotation PDF link annotation
    • https://yziact.fr/wp-content/plugins/super-forms/uploads/php/files/jnlh2h5c7qlljgi70ob5vcbrvr/6973264677.pdfIn PDF document text
    • http://xn--49s538bo8ux8c.net/userfiles/file/17251313987.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210607_26036E439756053C.pdfIn PDF document text
    • https://oteaexpert.fr/cite_imgs/file/nujar.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/8a21a8b572b5b899397bde75095dfb9a/70126890303.pdfIn PDF document text
    • http://pferdefreunde-brueckenhof.de/sites/default/files/userfiles/file/37034115638.pdfIn PDF document text
    • http://badaranquehablar.com/userfiles/files/jebimofifizeneko.pdfIn PDF document text
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/16108468b6e61d---8099722204.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b8e36b1d292---nagibevatug.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/23421789531.pdfIn PDF document text
    • https://southwestlooms.com/admin/userfiles/files/16739597366.pdfIn PDF document text
    • https://alexandrapanayotou.com/web/images/static/file/pitevixatajuvelupipef.pdfIn PDF document text
    • http://abroadster.com/files/memifipowedafemudewipul.pdfIn PDF document text
    • http://rockoncharters.net/home/rock/public_html/ckfinder/userfiles/files/senaraguko.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1610e6dd455402---jibagumiwidipu.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/16097c132afb16---wakerefutodiliruzozaw.pdfIn PDF document text
    • http://adria-ex.com/images/blog/file/bodoxezuf.pdfIn PDF document text
    • http://vankouwenenmastop.nl/UserFiles/file/73036947716.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/fdb7ffc32807790b649dd9877d486ced/97781328375.pdfIn PDF document text
    • http://nsdadventist.org/FCKData/file/sirezapofaxedon.pdfIn PDF document text
    • http://sutphinsgermanshepherds.com/clients/21958/File/9588953497.pdfIn PDF document text
    • http://hillandbrownfamily.com/clients/76964/File/resamerejexisusiki.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/61263855921.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b423c09a317---53604254555.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_off0000d75c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD75C 10756 bytes
SHA-256: 369785e2d14d78260e621780b8fb3e6aa7f50ac71122c3a3e134083d0f1be2f9
font_01_sfnt_off0000efbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFBB 17972 bytes
SHA-256: 686a186aa1d1c45995d9c1ae1820cfd6fa5b17cf0321973258c5010941e73e5e
font_02_sfnt_off00011ddd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1