Malicious PDF — malware analysis report

Static analysis result for SHA-256 f0522fb1a351a21e…

MALICIOUS

PDF

96.9 KB Created: 2021-08-08 10:00:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-22
MD5: e8e9eb7a2f374991d573fd7b94381ee3 SHA-1: 8d7717d6b9b3cb1277749bfdac5a76ef1e1f78fd SHA-256: f0522fb1a351a21ea1998768cfb8d7c170cc35ffaf0db6fd9db42c6e006292b7
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 0.9979

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://irlanc.ru/uplcv?utm_term=problemas+resueltos+de+estatica+primera+condicion+de+equilibrio PDF link annotation
    • https://cytairtool.com/test/userfiles/file/20210608_f9fc6.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608b54d58585b---59904013353.pdfIn PDF document text
    • https://tlpnw.com/wp-content/plugins/super-forms/uploads/php/files/e07496fa949ede8b9e8ea3e1e943a78f/kogopijud.pdfIn PDF document text
    • https://larioenergy.net/uploads/file/89507120588.pdfIn PDF document text
    • http://www.deco-interieure.com/userfiles/file/fotojekebekerojepupu.pdfIn PDF document text
    • http://debsluxe.com/clients/1/17/174397649ed9f07baa8f9d9f48c72a4d/File/89165701529.pdfIn PDF document text
    • http://learnersdigest.org/userfiles/file/zedefizesigosimegu.pdfIn PDF document text
    • https://www.naabelectric.com/userfiles/files/zezejadudotodim.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/94547885109.pdfIn PDF document text
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/160849f25b266d---84038894040.pdfIn PDF document text
    • http://klpa.net/userData/board/file/43000515126.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/17419104330.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16092f1d4483ba---foruzodise.pdfIn PDF document text
    • https://agrotehholding.ru/wp-content/plugins/super-forms/uploads/php/files/52ca7595ee67f963f8c1b118260096e1/47473548669.pdfIn PDF document text
    • http://wshs67rocks.com/clients/9/94/942520bde836a0b401740df6f3d23d35/File/11619030821.pdfIn PDF document text
    • http://boulderdivorcelaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e15721ff02---metezopuzefoje.pdfIn PDF document text
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160b5e3d72eeca---97915562846.pdfIn PDF document text
    • http://quimis.org/js/ckfinder/userfiles/files/kodigawujub.pdfIn PDF document text
    • https://szaniterplaza.hu/ckfinder/userfiles/files/72775246563.pdfIn PDF document text
    • https://bangprice.com/bangprice.com/beta/cms_image/file/5321262760.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb2de710f5---9906923600.pdfIn PDF document text
    • http://ccsl.asia/files/31520384494.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/e5k8dk1rgepf47n6mbja2da03i/vewuvizikidixizije.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/4hs7usl3s3q8si6i881gep484l/lijozolun.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB56 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11368 18404 bytes
SHA-256: d1dbef06cb1d197e929e317ea252d5f129c2534a544b30888db18b96527916b4
font_02_sfnt_off00014267.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14267 11060 bytes
SHA-256: f2b413f7dd54aab0d17a15538e9a61005aa022c37703ac6ce835e31fe4a2b0ef
font_03_sfnt_off00015bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BAD 16376 bytes
SHA-256: 0c133022d1e9883d2ff7035cf84f1fa0be9cfa0d671266bc5a940283bc0f9855

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