Malicious PDF — malware analysis report

Static analysis result for SHA-256 a52105ef41e16282…

MALICIOUS

PDF

76.7 KB Created: 2021-06-26 02:36:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d154b464ae9029af6e6ff0074a0bc303 SHA-1: fc0b4ba83f84921f1cd077242bd405896c172766 SHA-256: a52105ef41e16282e536d94b389581b38c7dea656d20135d61ea0313545a2a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress upload directories and other disposable hosting. The primary purpose appears to be directing users to malicious content, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wooshin.kr/uploaded/file/40430136860a27d364dd4e.pdf
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfde9677371---26934410343.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/3408b5e2140cead47254d8518d0a073b/72368877824.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/v5eht4ioklee4dhn2r6c9gif4u/69124196028.pdf
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/bfa945eff112ca6eb5f9f408154f6d9b/lupivofazorezubo.pdf
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/424e3104af6198e0742b719d3a1a61b6/gununilebapuzakaru.pdf
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/f4d297476ee12e513316075dac703e67/93104380008.pdf
    • http://sushiosushi.com/uploads/files/8339282517.pdf
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/16084f3d0e9ff9---goxinulizun.pdf
    • http://tavernadelsnoguers.com/wp-content/plugins/super-forms/uploads/php/files/d37944a749fa6ccb0bd1716f1849a2fb/magewufapozagutozekoroxe.pdf
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607eb50a4c883---99125447908.pdf
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c66c81563e---29832897111.pdf
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cabb89246b1---95852005499.pdf
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/g1fuap533c3uqfem2os9v3go70/62331606670.pdf
    • http://sportingclubalbinia.eu/userfiles/files/sapenutuxo.pdf
    • https://www.formwork.co.uk/wp-content/plugins/super-forms/uploads/php/files/i25k434unqm43pe608ks003sr4/kuxorikalofigexuposesan.pdf
    • https://foxtailmag.net/wp-content/plugins/super-forms/uploads/php/files/e0c38096bfe418d9e2a08ed5c8964906/99994930471.pdf
    • https://www.herewardcarpets.co.uk/wp-content/plugins/super-forms/uploads/php/files/l0mthqt7i3ece515dumpj4vp47/66682308615.pdf
    • http://www.unidacardoso.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c309cd1fad8---jitawa.pdf
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/4fb985bf6783f90c9f5d6201ecbb418f/firovabonoruzigetoxe.pdf
    • https://ludifrance.fr/userfiles/file/bukevasuwuj.pdf
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/v4iltesee8bsm5nimk3i9j6ev2/nenovudaxadobesunixi.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=botany+an+introduction+to+plant+biology+6th+edition+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_off0000c5ae.bin
0af7c067ad66ce0b3b124733a6406e93cb116095ee8ac2da2d0fc866ad2ba9ab
pdf-font-stream PDF embedded font (sfnt) at offset 0xC5AE 16460 bytes
font_01_sfnt_off0000f0dd.bin
0822512865f98a57b1b57aa6048171653696672708a6701ce3c7f4c5fac849c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DD 11304 bytes
font_02_sfnt_off00010b01.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B01 16792 bytes