Malicious PDF — malware analysis report

Static analysis result for SHA-256 335e92745be9cad2…

MALICIOUS

PDF

79.7 KB Created: 2021-09-19 09:21:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e9997b2abcb6274dbda6b2c0bf60bf4a SHA-1: d3635f171b79c47a04f2117e38c9b2163b9bbbf8 SHA-256: 335e92745be9cad253039fc211efd7425070aced505a1bab78dc32c9722c7edf
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating embedded JavaScript and a link farm. The link farm points to compromised CMS uploads and disposable hosting, suggesting a phishing or malware distribution attempt. The embedded JavaScript likely facilitates the execution of malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

Heuristics 7

  • 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.
  • 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://theflowermaker.com/uploads/File/7917411675.pdf In PDF document text
    • http://transchem-tech.com/Uploadfiles/files/74072458046.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/vagoniru.pdfIn PDF document text
    • https://loyallcanada.com/editor_files/file/46316080942.pdfIn PDF document text
    • http://awards.nl/img/cms/file/13964032630.pdfIn PDF document text
    • http://biometria.pl/photos_fck/file/84289630529.pdfIn PDF document text
    • https://aicpwdosaeast.com/ckfinder/userfiles/files/pexukijidibegolexineluk.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/vosudododemozevifogu.pdfIn PDF document text
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161396946301e3---lofepuwopamewep.pdfIn PDF document text
    • http://sergeybazarov.ru/file/tidesagifokutakumima.pdfIn PDF document text
    • http://baheth24cars.com/ckfinder/userfiles/files/43780224648.pdfIn PDF document text
    • http://st-johnson.com/Uploadfiles/files/70637576604.pdfIn PDF document text
    • http://fitviewer.com/files/file/mezifonanuxexeb.pdfIn PDF document text
    • http://tlw.ro/UserFiles/file/63948040093.pdfIn PDF document text
    • http://nghiencuuykhoa.com/uploads/userfiles/file/dodusukivafaradezezavis.pdfIn PDF document text
    • https://jungleflightchiangmai.com/Uploads/files/gobepanezomezonizix.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/25286656546.pdfIn PDF document text
    • https://speculatio.in/ci/userfiles/files/rofigi.pdfIn PDF document text
    • https://webmodeli.com/wp-content/plugins/formcraft/file-upload/server/content/files/161368899f2172---47901418573.pdfIn PDF document text
    • http://shuimotongyuan.com/userfiles/file/fikozitonatekibamisifapub.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/66373540812.pdfIn PDF document text
    • http://aalzkj.love-mrt.com/upload/files/56873703725.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/f4331c95f7e5e51bf6cc243c53d54e0e/2963411516.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/77154528033.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161453d3a73239---94760386996.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/voturozamejepenifel.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=broken+dawn+3+mod+apkPDF 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_off0000cf73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF73 10552 bytes
SHA-256: 7c818469c6a6e0951d17aba10954b4a2677ed674eda5a75b139646f8f00b38d2
font_01_sfnt_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 18872 bytes
SHA-256: ce2e486f60fb8cbdc6c68323cca946f146ce7408a787427507d6232c8a73f0a4