Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4f89d0525689539…

MALICIOUS

PDF

133.0 KB Created: 2021-07-17 10:41:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8ca95f8191188932766850d4de35b82e SHA-1: 9ab0bda0356916e24769662c1628cecf4246069c SHA-256: a4f89d05256895397295419a5e3e25f9cefafb9898a29c63d7422165445bae4e
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, indicating a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9750

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://evergreendentistryva.com/app/webroot/js/ckfinder/userfiles/files/10304254122.pdf
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160afa1c8dee57---lusesepogoxur.pdf
    • https://hzautomatisering.nl/userfiles/file/bolileselox.pdf
    • https://asharfilalkulfi.com/ckfinder/userfiles/files/1189060604.pdf
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/160b0fd0f791d6---27982979704.pdf
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/160870d1aee170---sasikasojemepodixipuvil.pdf
    • http://maskaevlawyer.ru/userfiles/file/jolati.pdf
    • https://mimpiindah2.com/contents//files/fotojakemubafox.pdf
    • https://hasekei.jp/userfiles/file/zalilevutovarimezojesum.pdf
    • http://xn--b1akwe.xn--p1ai/userfiles/file/86737433256.pdf
    • http://geoodwierty.pl/files/file/33736922065.pdf
    • https://admonks.ru/wp-content/plugins/super-forms/uploads/php/files/858d07852ec3b61d8641314755a973c6/gofasidinudedisuxafusi.pdf
    • http://riverside-plaza.com/upload/userfile/files/46344043625.pdf
    • http://sunwisechem.com/Uploadfiles/files/buwiguvegesesari.pdf
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/9kg80jprae21rdh2bgvnc8pc06/24013240458.pdf
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16083713d09463---debirelufan.pdf
    • https://www.lokalesichtbarkeit.de/wp-content/plugins/super-forms/uploads/php/files/deejcrv7ovp5jhb1dbecfl28uq/95609673419.pdf
    • https://bacninhonline.com/webroot/img/files/tujizolawoxewuve.pdf
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5c01f6a3cb---sinazomugigovavukatevufe.pdf
    • https://www.freshstartdigitalmarketing.com/wp-content/plugins/super-forms/uploads/php/files/c82c98613dbd376b7b8c347074a956b3/demaxabitigegot.pdf
    • https://aydin-elektrik.com/resimler/files/30474259562.pdf
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c16ae8b5a9---95057768537.pdf
    • https://kawanmto.com/contents//files/11915082390.pdf
    • http://setadijital.com/img/userfiles/files/16474506176.pdf
    • http://www.morenoroofing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e2a4f053a3---tefoz.pdf
    • http://bayernglobal.de/userVZ//file/gokuxugodulijif.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/320dc1c610fe726daf5611d424ebbfef/devebizopukazonizederova.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=facial+acanthosis+nigricans
    • 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_off0001a752.bin
5fa7d655530f7686e8dd5e9a89c7ee0b7befb4321c630710190c4ed44ec96f05
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A752 18028 bytes
font_01_sfnt_off0001d6c7.bin
6c1a7846905a4083b5f982776048cffde70855bf82f349bac6b978d6ea14153e
pdf-font-stream PDF embedded font (sfnt) at offset 0x1D6C7 10356 bytes
font_02_sfnt_off0001ee13.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1EE13 16792 bytes