Malicious PDF — malware analysis report

Static analysis result for SHA-256 f50e63eb5b7d9ec1…

MALICIOUS

PDF

98.4 KB Created: 2021-07-13 21:38:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 06123ad3625976987d6e1d2038bc89ea SHA-1: 58ef112003e32af0910712cf66cbe4a1fa659e92 SHA-256: f50e63eb5b7d9ec10d0aa8c7ae7730e485e91e6b0b3cc96ac24c444bacad45d6
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites. Heuristics indicate this is a link farm, likely intended to direct users to malicious content or phishing pages. ClamAV detection as 'Pdf.Phishing.Trojan' further supports a malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9928

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://www.adelaarenergy.com/wp-content/plugins/super-forms/uploads/php/files/lth2b6vahrbaoq0o5rgbetp3ho/regixakukesono.pdf In PDF document text
    • https://bodwellassociates.com/wp-content/plugins/super-forms/uploads/php/files/6d8d4d7e6d631855626c24ae466d7326/25496464610.pdfIn PDF document text
    • https://givemeit.ru/wp-content/plugins/super-forms/uploads/php/files/e8454328413deec61796ba761ec79b1c/lilexaderukemewufivezofij.pdfIn PDF document text
    • https://krimgranit.ru/wp-content/plugins/super-forms/uploads/php/files/aedff72237f11f1943612f3856b56b18/fidug.pdfIn PDF document text
    • http://abogarestudio.com/userfiles/file/nuzizepufagotewaxetef.pdfIn PDF document text
    • http://yaeram.com/userData/board/file/sofupizeg.pdfIn PDF document text
    • https://quickonboarding.com/wp-content/plugins/super-forms/uploads/php/files/be52da7a1445f2f1b5f1c4fd0508af59/jilotusejulul.pdfIn PDF document text
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/23343242284.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/84706955634.pdfIn PDF document text
    • http://www.eflox.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072f72e69ecb---71773690813.pdfIn PDF document text
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/8bddkqfn23jtii3hquige09ij5/42251601919.pdfIn PDF document text
    • https://acgroupenterprise.com/userfiles/file/tepagedalozaruw.pdfIn PDF document text
    • https://www.travelticket.com.au/wp-content/plugins/super-forms/uploads/php/files/2pbmb0n43p6c0982quvd630b81/banavoja.pdfIn PDF document text
    • http://bridgesonthepark.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e4de9079e1---duliwawomemi.pdfIn PDF document text
    • http://ilkyoukais.com/Images/Media/files/66210466166.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/44045790252.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/rujepezamuzifafarinubafa.pdfIn PDF document text
    • https://bosgo.mn/uploads/files/mizog.pdfIn PDF document text
    • http://adams-gold.ru/archive/image/file/47959253372.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16085bd44b6fe8---65419325633.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/63450dfb6aa482793e5fa1fa35fb0231/62390499905.pdfIn PDF document text
    • http://olsztyntransportmedyczny.pl/userfiles/file/55708157080.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/7549d45b9b81ac64f4f151a127e14a78/setaxunaki.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/57104003536.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=daingerfield+state+park+reservationsPDF 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_off00011e0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E0A 17328 bytes
SHA-256: 4006ae3841eed5b32c3a545ef233ee9fe3c7ef7fd9db6b57f5c20539e27db359
font_01_sfnt_off00014b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B5B 10832 bytes
SHA-256: 59f5291535da70641814535e0945b0fef187ab8b3ce20f378bf601cd8dc1dfa1
font_02_sfnt_off0001644a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1644A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1