Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc298f998c3ac2a8…

MALICIOUS

PDF

91.2 KB Created: 2021-07-01 11:59:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e5404173db2c41212cd5a2856709f4d5 SHA-1: d936c439656c8aa3c3b46301a6072f72accb8e94 SHA-256: bc298f998c3ac2a81598b2e0a32a4cf1f314e9d8502e6048a039c67d87549126
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs pointing to compromised WordPress sites, indicating a link farm designed to redirect users to potentially malicious content. The ML classifier strongly flagged this PDF as malicious, supporting the assessment that it is used for malicious redirection. No scripts were extracted, but the extensive use of compromised domains suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://infrive.ru/uplcv?utm_term=for+what+value+of+k+the+matrix+is+not+invertible PDF link annotation
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e2c203ea03---bujefu.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/6095ef0ebac2a91feb0742d6eab75d41/kasumufevuborelogaromiwip.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/025309337879c31556f9fa3db898b3d8/xapedatowozepomutafuweja.pdfIn PDF document text
    • http://sunnysideclassof64.com/clients/a/ac/acc4ccb49d7935ca36198347b895393e/File/8788642409.pdfIn PDF document text
    • http://siembra.me/uploads/files/fikal.pdfIn PDF document text
    • http://jp-cable.com/d/files/53576258001.pdfIn PDF document text
    • http://belgium-ex.com/images/blog//file/68386333110.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/mfafo2ns194t45bcjspckpdoh3/letafafokagedosufo.pdfIn PDF document text
    • https://www.lesson-online.org/wp-content/plugins/super-forms/uploads/php/files/iqn2a65totp7d238ieivrqusv2/92197105450.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/f9697f2142f59a47e3cb4b5b90a672bc/gulababuwumexerazem.pdfIn PDF document text
    • https://1sis.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a3f562dc5---28921752793.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/vuwededujotidalezobekot.pdfIn PDF document text
    • http://nw-line.ru/generic/uploaded/83073734484.pdfIn PDF document text
    • http://khanaphatgroup.com/UserFiles/file/76758878096.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ff813231a8---viwiva.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab125da9607---vunemokilugosob.pdfIn PDF document text
    • http://alnadaoil.com/userfiles/file/vitijoruvudadaxop.pdfIn PDF document text
    • http://nhactheducthammy.com/upload/files/nerorumutajoxokiv.pdfIn PDF document text
    • https://masterok-kovka.ru/wp-content/plugins/super-forms/uploads/php/files/62363bf8e83828c490196aff60edfc1f/sevipesazerape.pdfIn PDF document text
    • https://bindazzled.com.au/wp-content/plugins/super-forms/uploads/php/files/c1f99d326be5e00c93abe382069f984f/nulewozivunisaxukixigevuz.pdfIn PDF document text
    • http://zamokugrofa.sk/admin/fckeditor/file/fumaxofomatim.pdfIn PDF document text
    • https://traonguoc.vn/wp-content/plugins/super-forms/uploads/php/files/9si4n27rr963koloelekh3vl3b/xetulizisititilafekisegeg.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000111db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111DB 11040 bytes
SHA-256: 9669af3ea482f72a0bc47df23aea3955af188ad6070a4fcadd262ae02103ab7a
font_02_sfnt_off00012b6a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B6A 19076 bytes
SHA-256: fd5e21ee480e6335c7c587b0f3785829b30d404daae28106f06f461e183f6c11

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