Malicious PDF — malware analysis report

Static analysis result for SHA-256 90eed31dbcd6baf8…

MALICIOUS

PDF

86.4 KB Created: 2021-07-05 21:54:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c9b513638d99231cfd9f90f4ad2a8e SHA-1: e89d785fdf2dedb301cd73f2997aa8d9fe2c3702 SHA-256: 90eed31dbcd6baf8f06ac809744f317ded4a1f39055ac74d41a851a272aa2cfb
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating it is likely a phishing or trojan delivery mechanism. It contains numerous embedded URLs, many of which point to compromised WordPress upload directories, suggesting a tactic to host malicious content or redirect users to malicious sites. The presence of a link farm on disposable hosting further supports a malicious intent to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://adaviestransportltd.com/userfiles/file/lenexela.pdf
    • http://studio-castiglioni.com/userfiles/files/nofaroxiludipulunazaf.pdf
    • http://miamiwars.pl/wp-content/plugins/super-forms/uploads/php/files/775e8a40667dfefa5987ccc6a9ca6d0f/lejezorexusozokebat.pdf
    • http://stalmont.eu/userfiles/file/lemobixazapir.pdf
    • http://autosoftware.company/autoresponders_images/files/11926143932.pdf
    • https://www.chinacimctrailer.com/wp-content/plugins/super-forms/uploads/php/files/abc391c56406d8a98edb20ef4136d940/96771187992.pdf
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/6de607a0c3ff545a5538081dedf74bf5/49196843467.pdf
    • http://avsa.org/sites/default/files/images/files/28036673538.pdf
    • http://haiqi-machine.com/d/files/75116040437.pdf
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b36cf5381bc---77097092451.pdf
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160803a82877d7---pugikuxoxapujodo.pdf
    • https://siyata.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160ba748aee674---rugedawovekuzedukepi.pdf
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e1010975a2---xibeketapukoje.pdf
    • http://www.peplex.it/wp-content/plugins/formcraft/file-upload/server/content/files/16073a222efbfc---39020623989.pdf
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/04155ca43ff08edae99973a1725a9bf9/zaxiteto.pdf
    • http://iphysiology.ru/upload/lexowepewu.pdf
    • http://bixenony.com/userfiles/files/domadezofivigu.pdf
    • https://k2salight.com/wp-content/plugins/super-forms/uploads/php/files/b8fc6bd69fde18ce9b14d97239e1228a/gonatiwukukatutetiposim.pdf
    • https://gertiesbloomers.com/kousumi/nulook/upload/fckimages/file/59785815890.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/6c2ebeb6654cddd47ed8f6e1d92f44b4/89667249134.pdf
    • http://rockycheng.com/ckfinder/userfiles/files/rulajadulepufimiveb.pdf
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3ff52f8a---25547099124.pdf
    • http://mijneigenlift.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607246ac4af4c---sokut.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=cross+examination+questions+for+defense
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed1d.bin
5168dcd249841c3587d463be7a7a0a2f1d6623136ea90c1408479c403b78e364
pdf-font-stream PDF embedded font (sfnt) at offset 0xED1D 10848 bytes
font_01_sfnt_off000105f9.bin
ff4f60d14d1cfd8b08e35d68383e23736510e1e3432b6b4b1b0fcff172fb6658
pdf-font-stream PDF embedded font (sfnt) at offset 0x105F9 17868 bytes
font_02_sfnt_off00013454.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13454 16792 bytes