Malicious PDF — malware analysis report

Static analysis result for SHA-256 a356723d108dd5cd…

MALICIOUS

PDF

87.6 KB Created: 2021-09-02 04:48:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 95c875268671adccaa2d2647574e5f5b SHA-1: bc71bc045f140f53d77a8db6b24c9073aa6030e2 SHA-256: a356723d108dd5cd243c4143e9631bd04bd3eee52d661b970df5bb422c9b5bed
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URLs, many hosted on compromised or disposable domains, suggesting a link farm designed to redirect users to malicious content. The presence of these URLs and the overall structure point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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 https://irlanc.ru/uplcv?utm_term=the+god+of PDF link annotation
    • http://usarsenal.it/userfiles/files/82859766111.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/nufupafewajumozevu.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/daa8f6571704a15696431d2e3f570d56/425406867.pdfIn PDF document text
    • http://kondicionery-domodedovo.ru/upload_picture/file/depavasogogajegatotado.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/tinida.pdfIn PDF document text
    • http://www.melloecastro.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d99d50456---82705248019.pdfIn PDF document text
    • http://www.barbazan-debat.fr/ckfinder/userfiles/files/radawopafej.pdfIn PDF document text
    • http://suliaox.com/v15/Upload/file/2021824178488738.pdfIn PDF document text
    • http://ljhalls.com/wp-content/plugins/super-forms/uploads/php/files/d3dada7f6ae430bb390385ceb0253466/28446875175.pdfIn PDF document text
    • https://dacoma.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160de4ad66cade---baxepixulinefosuvo.pdfIn PDF document text
    • https://wineart.online/userfiles/file/23104629399.pdfIn PDF document text
    • http://hsound.ro/images/custom/file/zatomafozasafidogu.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/a7456daa407957cb3391f8308f56fbc5/gezolozitegila.pdfIn PDF document text
    • http://residenceraffaellotorino.com/userfiles/files/mikibaw.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160f98f3fcd48f---19214244517.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/d6602c60b304a36410cf6c37b0fad27d/nuzuzaxevepagagobasero.pdfIn PDF document text
    • http://archi-m.ru/userfiles/file/82708818299.pdfIn PDF document text
    • https://xn----7sbbjg7ctfs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/7a0d385d60f37daf271584605e534f52/48205447371.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/6g9i4q5f5628mcpf7jvioaqop2/powanematumufuzagegalosip.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a092303cd07---fagelefilitubekobusuzele.pdfIn PDF document text
    • http://hollandunitedreunion.com/clients/5/52/52f3fdf721cdccceb566e47094f1d9de/File/96628153341.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/95980030910.pdfIn PDF document text
    • https://www.harnoordesigns.com/wp-content/plugins/super-forms/uploads/php/files/in42cglbvhui46i7r5submbsf4/22607273506.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_off0000f074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF074 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010886.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10886 19636 bytes
SHA-256: bd4ab38ada39e20fca295976db0eb79d5a7761a689b867fcdf4b38007c0f2631
font_02_sfnt_off00013bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13BD0 9824 bytes
SHA-256: c35861e3e3ce5c964839b9f374ae92cfef4ebe99a0b6c56d23687ec49b2c0ae8