Malicious PDF — malware analysis report

Static analysis result for SHA-256 153d2f435f74351b…

MALICIOUS

PDF

73.7 KB Created: 2021-06-26 07:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 5287d651a55f9f138692317b418d8d61 SHA-1: 9105ef14cf9e327a28196f13fda8cb6931af1f20 SHA-256: 153d2f435f74351bf02fcd77645a870d015ac1bf461b55b3d4a1fdbe3c27dd97
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to various domains, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the link farm structure itself is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://alpanelektrik.com/depo/sayfaresim/file/jibuzarekutirede.pdf
    • https://otartufo.com/ckfinder/tartufofiles/files/xibitevumir.pdf
    • http://red-persimmons.com/upfiles/editor/files/31684506003.pdf
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d4b2358f32---wukuvexilemipomun.pdf
    • http://jockmurray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4f09110300---vatenizatefu.pdf
    • https://big-cash.de/wp-content/plugins/super-forms/uploads/php/files/f1q6vnb0fheo78h0k3rejb21cf/46699631756.pdf
    • http://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/a268d5f0788a6c1f18ee5878c0bfedec/91530136561.pdf
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3d5b2f7c3---9390430801.pdf
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160946cff441e3---nemomuvutepuxoronibu.pdf
    • https://twfern.org/upload/ckfinder_temp/files/20210528054500.pdf
    • http://parkhighclassof60.com/clients/871169/File/selebezowexag.pdf
    • http://hongdacable.com/d/files/sadigidiz.pdf
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/1609105992fef1---11965462741.pdf
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/a27899f5f0f8bf3cdbcfae6977cbf67e/lerirowowejozexufale.pdf
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/o30aa17pj1q4b08m7bgoslr53m/27485792639.pdf
    • http://www.fattyweng.com.sg/wp-content/plugins/formcraft/file-upload/server/content/files/16086b17a43592---borepawuwikuf.pdf
    • http://filatelianumismaticaumbra.it/userfiles/file/65397712321.pdf
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/762tsr5a9ulpj70gdpjn3pjts7/nupufisu.pdf
    • https://stewsites.com/wp-content/plugins/super-forms/uploads/php/files/322570d8761ad41e16b4c772ba6d217f/27459796259.pdf
    • http://pkynfe.net/userfiles/file/vulexi.pdf
    • https://www.hotel-palladium.gr/wp-content/plugins/super-forms/uploads/php/files/k2r0m9cql2kumha2p0eu7o1n0e/mediluforigotor.pdf
    • https://www.ezhealthcheck.com/wp-content/plugins/super-forms/uploads/php/files/60a9mj8vcmef9ptpsldv0c7ied/64987024111.pdf
    • http://globaltruthmediagroup.com/clients/a/aa/aa8380eac451876ae6ab993bf3a720d6/File/15478412229.pdf
    • https://office-agglo-larochelle.fr/userfiles/file/8183374545.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=young+hot+guys+naked
    • 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_off0000be9a.bin
f06df4d106dcc4d11fbc76cbcee440eb40784d611c41452aa4651ebf468f65e2
pdf-font-stream PDF embedded font (sfnt) at offset 0xBE9A 15956 bytes
font_01_sfnt_off0000e807.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE807 16792 bytes
font_02_sfnt_off0001001e.bin
c3824172f359f813f210c5adc5abc0b5dd5cd0a021d35e9c27e893887f3d80cc
pdf-font-stream PDF embedded font (sfnt) at offset 0x1001E 10576 bytes