Malicious PDF — malware analysis report

Static analysis result for SHA-256 de7a018d800a6956…

MALICIOUS

PDF

84.6 KB Created: 2021-08-04 22:08:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 05c11ad0573214b1c04e9e39112ddbed SHA-1: 5b92e48a06b243607665836f59d8e545506f6877 SHA-256: de7a018d800a6956deda983f3d0dd3f64c7927482ab0c12e626f5a3aac930ed8
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

Heuristics 6

  • 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://pistant.ru/uplcv?utm_term=youtube+boss+and+me+episode+30+subtitle+indonesia PDF link annotation
    • http://www.kickcommerce.com/userfiles/file/14002410866.pdfIn PDF document text
    • http://factory-01.com/js/upload/files/19355501339.pdfIn PDF document text
    • https://alshaabcoop.com/userfiles/file/simude.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/vcq1ato3gso4sbr04t34sl01ks/kopaxubemoxizutaw.pdfIn PDF document text
    • https://bursakaynak.net/userfiles/file/tixevowijinixaxev.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/90313734058.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/7ca627293440a8d112c04482ccd4479d/zijunara.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/9s0emeoji22be5flbaj0jdhd51/52320965298.pdfIn PDF document text
    • https://arabacioyunlar.com/calisma2/files/uploads/37054234357.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/gajoj.pdfIn PDF document text
    • http://pho32shabu.com/uploads/files/foroditeratapofelorusewe.pdfIn PDF document text
    • http://mfplus.ba/wp-content/plugins/formcraft/file-upload/server/content/files/160a78b4ed9b9e---fekeka.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/pupujaj.pdfIn PDF document text
    • https://www.engltg.com/wp-content/plugins/super-forms/uploads/php/files/70b41a629d1e78e322c7954640c887df/gazexogezasimilorap.pdfIn PDF document text
    • http://www.aadhar-interior.com/userfiles/file/fifab.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/160e8b14b2b90a---kenalipux.pdfIn PDF document text
    • https://www.ediliziaindustriale.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079272e4611e---nixazunul.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/d6175598e867cb04a11ce3ef6d73cac9/niramavevuxarodufude.pdfIn PDF document text
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/gnss22q2oddpmd3h4a78kkvn86/gobanuvizaberuf.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b60c2199cdf---82794097320.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087778dd3a6f---16732854865.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4fdf18735---ravirufad.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_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10972 bytes
SHA-256: 4307b2601a7f00aa4979f21c396a37e5586a9f9cd9344df2c1045607c6480483
font_01_sfnt_off0000fc47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC47 18728 bytes
SHA-256: e385789e59413e3ac4659c607b862e460f0328b879e4b4a8ec2af8c70bcba762
font_02_sfnt_off00012b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B36 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1