Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac23a83c8c987e8…

MALICIOUS

PDF

87.0 KB Created: 2021-09-18 17:13:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 29c992fded975b38babbf0c849348b64 SHA-1: 9a3812b15c31382b62d1f381f2459f3f75bfa746 SHA-256: 3ac23a83c8c987e8a5ea21815e4cc929e0fb62c77fcfe33407e782027a6b08c1
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised websites or disposable hosting, indicative of a link farm used for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL analysis point towards a malicious document designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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://morethancars.nl/uploads/edytor/file/lakadevevazamuvib.pdf In PDF document text
    • http://jrmhandling.nl/upload/file/seram.pdfIn PDF document text
    • https://photographerin.agency/wp-content/plugins/super-forms/uploads/php/files/b5aagkmkd1b8rlppr8hgo3l1s0/kivojibep.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613972291bc66---fuluz.pdfIn PDF document text
    • http://misterholidaysanprisco.it/userfiles/files/99631581263.pdfIn PDF document text
    • https://saikekanglun.com/filespath/files/20210905131121.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/joxetedaji.pdfIn PDF document text
    • https://pensionradvanice.cz/res/file/luvogenilizozaj.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b22094e074---62412327163.pdfIn PDF document text
    • https://nibrasimansch.com/userfiles/files/42017003965.pdfIn PDF document text
    • https://uslugiinzynierskie.com/eurostyl/photos/file/43190129894.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/96502085940.pdfIn PDF document text
    • http://ginzaoakland.com/uploads/files/sapumunavakoluxe.pdfIn PDF document text
    • http://hujiangsy.com/upload/files/vorasitexorerijate.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/sexugotefu.pdfIn PDF document text
    • https://cremyco.com/app/webroot/docs/file/gejipaxatateto.pdfIn PDF document text
    • https://xtremefitksa.com/ckfinder/userfiles/files/1463594864.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/warorosi.pdfIn PDF document text
    • https://eetravel.net/file/kidanafavigamani.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/iaj699ikevmk1q129pinhrhbvj/muperovaxexawejoxarolivup.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/66aa932c0d590ee40651ecebdda1f080/67313543219.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/49839673812.pdfIn PDF document text
    • http://bsa-billiard.by/images_from_html_editor/file/36436808698.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9df2ae9b5---83672871308.pdfIn PDF document text
    • https://wodepcb.cn/uploadfiles/files/28443105549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=top+ad+free+android+gamesPDF link annotation
    • http://crossfit28.com.s125853.gridserver.com/siteuploads/editorimg/file/57174900953.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_off0000f174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF174 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001098b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098B 10660 bytes
SHA-256: ce33a7de3b43a3fd48d3bf530a2047e2b00fc0f429e42a0ab81e7e50f5ff6e5a
font_02_sfnt_off000121ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121AD 17172 bytes
SHA-256: 027f82cc90ccbd3c26a4939dfe9cdd4fe9da5d3c3ccb6492e648afc9e4c1ff98