Malicious PDF — malware analysis report

Static analysis result for SHA-256 d935adc25f87ae91…

MALICIOUS

PDF

79.9 KB Created: 2021-08-08 18:01:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 25eab9a8d1298ae703342c31b8e2fa49 SHA-1: 5f5b45d19d98545027ba77353766e9144ba6508f SHA-256: d935adc25f87ae914ae708cdc78a5ce07f5ed22e5e3a5b5d7c888888f59911ca
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external URLs, many hosted on compromised WordPress sites. The presence of external URIs and link farm indicators suggests the document is designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=2008+smart+fortwo+repair+manual PDF link annotation
    • http://opalsolar.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606efa27e1246---jakilewexotu.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16098acfcc4ad8---fefamevagebajitabidona.pdfIn PDF document text
    • https://eletvital.hu/uploads/files/28701523482.pdfIn PDF document text
    • http://www.onegelha.com/wp-content/plugins/super-forms/uploads/php/files/7504c1c9a36a742cf4e1f1549e9322c9/2309530822.pdfIn PDF document text
    • http://movementlab.dk/userfiles/file/83397337081.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/nmgb0ud9o8f69iqt2fat4rsnfu/4350726677.pdfIn PDF document text
    • https://celebicatering.com/upload/ckfinder/files/viwadisuvovowonizuso.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/tigunopetefaxonijazo.pdfIn PDF document text
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/2f8hhmemde11a4r0ursltf71v2/mupisa.pdfIn PDF document text
    • https://tigercabinetry.com/wp-content/plugins/super-forms/uploads/php/files/1bf41b13ad616d2c247a99fc917abdc4/95600964853.pdfIn PDF document text
    • http://sanchariglobal.com/userfiles/file/zobafirufup.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160751b03de34d---mimiwuniterudubaxejaz.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/userfiles/file/7949691471.pdfIn PDF document text
    • https://www.popcaffe.it/wp-content/plugins/super-forms/uploads/php/files/bd378e2a91e10f48d435331dc5ff9739/70675560627.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c146d40344---44566459199.pdfIn PDF document text
    • http://adabaskimerkezi.com/upload/file/kanag.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610825b4d7244---fukerowajizix.pdfIn PDF document text
    • http://www.rlktechniek.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54f3e7543---wizuduso.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/92105288103.pdfIn PDF document text
    • https://carstenrath.com/wp-content/plugins/super-forms/uploads/php/files/5nff0mhd3aijeu8tbc952en65d/fufemowo.pdfIn PDF document text
    • https://glosunspa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fc5fa568fe1---24342570319.pdfIn PDF document text
    • http://joy05.com/_UploadFile/Images/file/vutalit.pdfIn PDF document text
    • https://diaochue.vn/userfiles/file/78598151452.pdfIn PDF document text
    • http://hy-concrete.ru/d/files/mabusuj.pdfIn PDF document text
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/f92c505cb27b6f67e201c66f0464d66e/fazekuxuxeriritalini.pdfIn PDF document text
    • https://yourtuscanyguide.com/wp-content/plugins/super-forms/uploads/php/files/h97fmd1866udu91k80kmcfsvc6/44186712585.pdfIn PDF document text
    • 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_off0000d4c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4C7 16480 bytes
SHA-256: 237f5b8cc9f54c490768490ad8593f455d52af41b874c842e2df8ddd2dbd52af
font_01_sfnt_off0000ffa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFA4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000117bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117BB 11056 bytes
SHA-256: ce25a3ae58b89ff0c5ccaf706f6aa54ff3bdd1d405bdd32ec58486f8764ac3e1