Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6a20dd7085c365a…

MALICIOUS

PDF

106.3 KB Created: 2021-09-21 09:23:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 2d13f6d4cff81077e963a097975ad571 SHA-1: d7b944fa653dd1c4bce38d4603638a1c69bda48b SHA-256: c6a20dd7085c365a9c6ca0af4d06f36bfd589179b61dd1f11e5f4c78a286994f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs and exhibits characteristics of a link farm, with many pointing to disposable hosting or compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and URL patterns suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9867

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://crysiq.ru/uplcv?utm_term=playstation+emulator+android PDF link annotation
    • http://alda.pl/ckfinder/userfiles/files/56912894093.pdfIn PDF document text
    • https://francemonde.news/UserFiles/file/gadejegebiboralalajobep.pdfIn PDF document text
    • http://www.deewanalarab.com/up_imgs/41382506682.pdfIn PDF document text
    • http://jjinline.org/file_upload/file/18675215198.pdfIn PDF document text
    • https://tekdalyapi.com/upload/ckfinder/files/68909718939.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161436252ed360---jamujojimamadu.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/de488d2e49c2e79562d272c8306cdb42/bulasafibawuwiposusafe.pdfIn PDF document text
    • http://www.clc-engineering.com/siteuploads/editorimg/file/memejag.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/zakedofasexibasakube.pdfIn PDF document text
    • http://kahsport.cz/userfiles/file/302624422.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/92480370479.pdfIn PDF document text
    • https://digitaluzaktanegitim.com/calisma2/files/uploads/safumapis.pdfIn PDF document text
    • http://kemenyseprosiklos.hu/upload/file/87171752641.pdfIn PDF document text
    • https://shreenatharcade.com/userfiles/file/31662863170.pdfIn PDF document text
    • http://www.egavilanes.com/ckfinder/userfiles/files/88826600931.pdfIn PDF document text
    • http://saktigroup.in/uploads/91323768166.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/161335671c0252---42794893005.pdfIn PDF document text
    • http://showpelec.com/data/file/20210909_183526_567.pdfIn PDF document text
    • https://coastalholidayproperty.com/ckfinder/userfiles/files/22287895515.pdfIn PDF document text
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/jupk7kmdao133v7222kn0oa006/40874283994.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/tovebanedebabodavofugas.pdfIn PDF document text
    • https://satnamunicipalcorporation.com/admin/ckfinder/userfiles/files/89032772895.pdfIn PDF document text
    • https://cityface.cz/res/file/tuvepuwamedamijejewet.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/zatilute.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5a68551b7---31973051453.pdfIn PDF document text
    • http://fortlauderdalelimorental.net/wp-content/plugins/formcraft/file-upload/server/content/files/16130200dd4e36---xolivuwevepamotadan.pdfIn PDF document text
    • https://chief-moving.com/editor_upload/file/96066199897.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_off0001393b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1393B 18764 bytes
SHA-256: 99b45c14056a5e976cfeeec9de409c5747a61ab957b033a40bed975d249bde15
font_01_sfnt_off00016a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A80 10624 bytes
SHA-256: 6d93232d9ff8a201572a6ae632cab0498e71c994d380b6babbf4c60e21c051ed
font_02_sfnt_off000182d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x182D7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1