Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f0b5e7a78ad186f…

MALICIOUS

PDF

97.4 KB Created: 2021-09-07 16:24:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 62a70bf976d923abb99dbc1dfae328fd SHA-1: 27b7bc13c5ba28aa9769234af372fb3bb7608c99 SHA-256: 2f0b5e7a78ad186fbb91a7829b6cb4c4f2f1b6270d734cdb980cfdb57c929c75
96 Risk Score

Malware Insights

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

This PDF document contains numerous links, many pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm for phishing or malware distribution. The ML classifier strongly indicates maliciousness. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, lacking readable content but containing embedded URLs that likely lead to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://crysiq.ru/uplcv?utm_term=makkar+ielts+cue+cards+2017+pdf+download PDF link annotation
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16098ac0995fc6---49708286612.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/mavikizavegodegejejovexa.pdfIn PDF document text
    • http://atek-ent.com/upload/file/komofisozabul.pdfIn PDF document text
    • http://prttour.ca/FileData/ckfinder/files/20210802_6739F20D874F227F.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/af7f9fe56ea7d7ab87cc7a3863721607/66341376971.pdfIn PDF document text
    • https://rclurie.com/wp-content/plugins/super-forms/uploads/php/files/ecee45eac52fdd0a2bbe85a9abf600be/pubunuzofibikogozu.pdfIn PDF document text
    • http://hurtmar.pl/Upload/file/muwazidoz.pdfIn PDF document text
    • https://earplighting.com/wp-content/plugins/super-forms/uploads/php/files/62d5b58b973eefaa6b478b396adb6d02/37514865462.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/b52i80umk7avvkp1b0mk9flufd/dobemuruw.pdfIn PDF document text
    • http://alisawedding.com/upload/users/files/pekizadi.pdfIn PDF document text
    • http://yuanyoujie.vip/userfiles/file/pefaw.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/0h5mff0mssm3k6nc88jv989ps2/25075575261.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612752f28dfae---73749750034.pdfIn PDF document text
    • https://equimat-cheval.fr/file/24161097319.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082aa789120d---tufex.pdfIn PDF document text
    • https://www.intermediastudios.com.mx/wp-content/plugins/super-forms/uploads/php/files/88602431b388cc0f8d5296207942f3c1/lunebozesajewin.pdfIn PDF document text
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/38cbcbe1bd32ccdd62b0b78026a376f9/85405396298.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/tubutin.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/233d8f039076da82ca46a18821bc17b2/33888354109.pdfIn PDF document text
    • http://avandcie-automation.fr/ckfinder/userfiles/files/73250246244.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_off000113a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113A6 18580 bytes
SHA-256: 045f010e1311d66505a852d1d0a06d69d7e9cd04f7ef3d4f605a28098682eda6
font_01_sfnt_off000143d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143D4 11228 bytes
SHA-256: 68bd7d5197ea0547ccd195a9fdb35fc96808235a251da3985d39b69d579074ae
font_02_sfnt_off00015e7e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15E7E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1