Malicious PDF — malware analysis report

Static analysis result for SHA-256 4da33dafef90686b…

MALICIOUS

PDF

84.1 KB Created: 2021-07-07 15:59:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 53c7a9ed95940537f35ddaf862bfa111 SHA-1: 85a895858a9c6558f2d34c3927740656a83c1e4a SHA-256: 4da33dafef90686b69b3ab693e3620084572cff2c608ecd33e501b6b6b81bffe
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites, suggesting it functions as a link farm to distribute malicious content or phish users. The document body is unreadable, but the presence of multiple PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly indicates a malicious intent to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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 https://eandjfamilyhealthcenter.com/wp-content/plugins/super-forms/uploads/php/files/564fb1059a74d86c3fe042a81dacfd14/70002547431.pdf In PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/160921b7ac4082---fubejivodoxigu.pdfIn PDF document text
    • https://dentinale.eu/wp-content/plugins/super-forms/uploads/php/files/b8c7464d34932e433a757ae2cceaae57/14995067943.pdfIn PDF document text
    • http://perles-del-beya.com/userfiles/file/wagibulutufebew.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607dc493eb143---gofutoximezebuforesiwaz.pdfIn PDF document text
    • https://www.ferienhof-schneider.de/wp-content/plugins/formcraft/file-upload/server/content/files/160abcabae5082---kolesinexiwelumufa.pdfIn PDF document text
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/b8c9d62829fe3bd565a84d2df5b20d88/bopiduwaji.pdfIn PDF document text
    • http://kolasinprevoz.rs/slike/files/77781355507.pdfIn PDF document text
    • https://club-sports.net/uploads/products/files/59553009394.pdfIn PDF document text
    • http://www.recetasyconsejos.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de2e20b709---21265874691.pdfIn PDF document text
    • https://impeka.lt/components/com_mijoshop/opencart/image/data/files/24586519650.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/87593458301.pdfIn PDF document text
    • http://szpk.hu/_user/file/niwilagekoniropuf.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e4ea2ac2dd---mumifoxevitarunemokakapi.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096e03e6fbe7---81568288103.pdfIn PDF document text
    • https://an-professional.ru/img/files/file/xidawizitalamizobas.pdfIn PDF document text
    • http://short-story.ru/upload/file/bajogi.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-5-15/20210515180328318519.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/10518217350.pdfIn PDF document text
    • http://lycee-elm.org/userfiles/file/67317538066.pdfIn PDF document text
    • https://haps.company/wp-content/plugins/super-forms/uploads/php/files/efteo93n44tgptjlpt8ech55p0/pufigarosuxibatesuten.pdfIn PDF document text
    • https://acethamessecurity.co.uk/wp-content/plugins/super-forms/uploads/php/files/6a69df3888bd68b7f227419ab2bc54bd/luputigixotedol.pdfIn PDF document text
    • https://markeishahall.com/wp-content/plugins/super-forms/uploads/php/files/65172bd232d449a152325c3559cbb660/luvakukanopalaramutokuguj.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/lafebasixudodulokuniz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=poly+over+lacquerPDF link annotation
    • 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_off0000ea1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA1C 16616 bytes
SHA-256: ed00a95a2336522a8b0c0b6c9152e9d216582fdfec1f3098de4b947fe936fdc5
font_01_sfnt_off00011457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11457 10188 bytes
SHA-256: bf97468bbb4b30a413b2edea12dc18da47a0ac5402c17a8ee30d48ffffc2924e
font_02_sfnt_off00012b60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12B60 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1