Malicious PDF — malware analysis report

Static analysis result for SHA-256 729dbbce105b6d34…

MALICIOUS

PDF

72.2 KB Created: 2021-09-10 15:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e3ed8c277ed1b1411553a8596e9d9249 SHA-1: a28824e9089b8c0bc01a7b813cb0ffec27fd56d6 SHA-256: 729dbbce105b6d34967d504ec024517f1d749a90ee4e9cd29ea0b03948f4167d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to disposable domains or compromised CMS upload storage, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with techniques used to host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://pixomot.ru/uplcv?utm_term=my+cafe+hack+apk+download PDF link annotation
    • https://virker-ikke.dk/files/93480783869.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/gevotib.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/titiloxuxubutokipozodip.pdfIn PDF document text
    • https://goodnest.info/tctt/sites/aaa/file/92643345973.pdfIn PDF document text
    • http://digivideos.net/ckfinder/userfiles/files/64435802823.pdfIn PDF document text
    • http://reutlinger.pl/userfiles/file/podujadejevubufovemu.pdfIn PDF document text
    • http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16137df0d98f04---10705659524.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/49269771068.pdfIn PDF document text
    • http://kcntanduc.vn/img_duhoc/files/80989452227.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161379819e6d64---rukedasojototuriwisatexow.pdfIn PDF document text
    • https://asigurareingermania.ro/wp-content/plugins/super-forms/uploads/php/files/5hg2psfsj80pc6nqjlddg69taa/zemoluwodozolifirepejare.pdfIn PDF document text
    • http://turningpointdigital.com/cote_dor_import/admin/ckfinder/userfiles/files/1316898059.pdfIn PDF document text
    • https://carrieres-pierre.com/userfiles/file/60476735765.pdfIn PDF document text
    • https://parklanehotel.asia/userfiles/file/12286735972.pdfIn PDF document text
    • http://cleanyachts.it/writable/public/userfiles/file/paxujujep.pdfIn PDF document text
    • https://psystat.net/candyticket/uploads/page_images/files/fogadusigudadafov.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/fa794093c09f73f30159a0d30b274874/27397634862.pdfIn PDF document text
    • http://ortopediaszombathely.hu/editor_up/48596694738.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sekiwafedufofanowapexa.pdfIn PDF document text
    • https://alatheir.com/atheirwsfiles/file/fafowawaboxeb.pdfIn PDF document text
    • http://transbur.ru/admin/ckfinder/userfiles/files/46802521697.pdfIn PDF document text
    • http://sovaimm.it/userfiles/files/61418949096.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_off0000b704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB704 17912 bytes
SHA-256: 6bc3c03ffab258e6b0bc3cb47de660b33889b8f995db492e738c3f3562153e5b
font_01_sfnt_off0000e385.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE385 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 10544 bytes
SHA-256: 0b46cb52c4c516718920ae5ada0e4c708249811b74d6dfd765e3cadae111590f