Malicious PDF — malware analysis report

Static analysis result for SHA-256 09578e9eb81e1f36…

MALICIOUS

PDF

85.1 KB Created: 2021-09-03 19:20:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: ccd2f2f31ff57b6929377c589c5d0f24 SHA-1: c5c07e975a010b1381fd0bbeb08c7bb3f233af55 SHA-256: 09578e9eb81e1f3678c988e5edea14d650064632460518938b8f8e861ce015ea
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised websites, indicating it's designed to lure users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. No scripts were extracted, but the link farm structure is a common tactic for initial access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://www.siscard.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b0073fc9c9c---83045466400.pdf In PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/0hs3kljijkoefs0bcc3tlf8gik/60721279820.pdfIn PDF document text
    • http://archi1919.com/smlclub-files/file/99195496211.pdfIn PDF document text
    • https://www.growxponential.com/wp-content/plugins/super-forms/uploads/php/files/tmhinogok1e21ucc9dknv08sst/jefelurovawalijone.pdfIn PDF document text
    • http://gibkrakow.pl/uploads/files/jirorogukotinubujemo.pdfIn PDF document text
    • http://ukicda.com/admin/fckeditor_upfiles/file/2021072505371480554.pdfIn PDF document text
    • http://texasstatealphaxialumnae.com/clients/f/fe/fe72632f573fdc77cca6b85875c63e8a/File/16481564171.pdfIn PDF document text
    • http://arkystudio.eu/userfiles/files/mitaxubarorujulas.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c26b364dcac---xomogusok.pdfIn PDF document text
    • https://doucetplasticsurgery.com/ckfinder/userfiles/files/fobekurasitovupi.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/80749087881.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/f127c136471cb019439320efdb5dee67/nikujinakutemo.pdfIn PDF document text
    • http://kozelsk-adm.ru/files/uploads/files/bewemolutetopoga.pdfIn PDF document text
    • http://administratieindex.nl/images/uploads/mibuxirow.pdfIn PDF document text
    • https://dmitrovka-zn.ru/admin/ckfinder/userfiles/files/vopobonudivitifidemafis.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16073e61d65410---37808776149.pdfIn PDF document text
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/4fa7845ee3ac721b513dab28c21d9b43/47280785104.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/2206980116.pdfIn PDF document text
    • https://orrizon.ru/images/file/38214946700.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607c3df27ea39---11002777709.pdfIn PDF document text
    • http://strefa-fitness.pl//fckeditor/editor/filemanager/connectors/phpplikifile/36766956545.pdfIn PDF document text
    • http://phongkhamducphuc.net/images/files/75382247633.pdfIn PDF document text
    • https://pilisilovaskert.hu/ckfinder/userfiles/files/13903176154.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/acad2380d15f6050fc965d8f980f11a2/gezigunidikijiluxa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=kannada+to+english+translate+pdfPDF 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_off0000e7a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A1 18304 bytes
SHA-256: a6a29cb4dcc7efdaf6d241404164ff0c4c27e0f4f9ae4fcb36ba05a1e9cfa076
font_01_sfnt_off0001166e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1166E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012e85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E85 10768 bytes
SHA-256: 1484b3eb78bbb706c3bcd705d13fcfe9e3ce44623da758da5b317a2b009de159