Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5654885c71d98ea…

MALICIOUS

PDF

82.2 KB Created: 2021-06-25 20:16:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1e7ab895df8a926d2cb69151a0ed5c44 SHA-1: 3e31f685e98a755dae3bf091b3893cc5bd25806d SHA-256: a5654885c71d98ea5cddac9e237db864c495212e4f7878fe05f454b1a258de76
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or are structured as link farms on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure suggests the PDF itself is designed to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://archism.ru/uplcv?utm_term=fire+and+ice+bar
    • http://jun-travel.com/userfiles/file/futifamivuvamagajigibexo.pdf
    • http://asirakademi.com/resimler/files/41436410612.pdf
    • http://www.toptehnik.si/images/lofekefinunexig.pdf
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/9f71f5d0b20e19cc7c4132854a819e28/tekafopitat.pdf
    • http://compufoxmail.com/userfiles/file/48197271886.pdf
    • http://ttlengenharia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607d0e5a24f26---wawurejotefogesina.pdf
    • https://www.advids.co/wp-content/plugins/formcraft/file-upload/server/content/files/160831616c3379---92774247006.pdf
    • https://pikewallis.no/wp-content/plugins/formcraft/file-upload/server/content/files/160bb77beb254d---remifuguforesarezane.pdf
    • http://thessalonikiflights.com/files/files/44974865464.pdf
    • http://akbmodel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160969f2bd5b82---14001187079.pdf
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/1be11e6ae6455b62a1742599de4dd4e4/tidujezitimesupukineroxo.pdf
    • https://thehamptonsbloomington.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094953d48926---giviwetinewef.pdf
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16085e883b6d20---bisatadi.pdf
    • https://www.mii.net/wp-content/plugins/super-forms/uploads/php/files/bf4c703615a1ae203163e200e8553813/719942879.pdf
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/lh6rjed9f4toccb2ok5l058ctg/80162486536.pdf
    • http://dawahcity.com/userfiles/file/14236440553.pdf
    • https://profipreklady.cz/www/ckfinder/userfiles/files/rovomezurubixinofuv.pdf
    • https://www.asahinadigital.com/wp-content/plugins/super-forms/uploads/php/files/cd7dvb6os7adav16qk7s0smcsn/wawonivozewomafowunud.pdf
    • http://soft-pro.hr/upload/datoteke/xedababadaxemo.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/c90f2c5d37123913f8e752e5c267655e/xefesulufalamabik.pdf
    • http://photographybynami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608577da2f76c---73210887016.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070a0df36cc5---kajufaw.pdf
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/638a42b7e4d335260955b0db2663f43a/50825111209.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/16096be73b37b4---jawifesutunuso.pdf
    • 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_off0000deb7.bin
e5379e9e87d39e14bcd390c7445fbd1f66ee63939403328e12204be59ef5576c
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEB7 18236 bytes
font_01_sfnt_off00010d78.bin
c568ad80021a832779895eaa0193679f440437337f1ad8bf7afad964784b1892
pdf-font-stream PDF embedded font (sfnt) at offset 0x10D78 10048 bytes
font_02_sfnt_off000123d6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x123D6 16792 bytes