Malicious PDF — malware analysis report

Static analysis result for SHA-256 65b89a12fbb8d8f8…

MALICIOUS

PDF

77.2 KB Created: 2021-09-04 11:48:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: dbcabbc2f299ee0f941fb13355c78d65 SHA-1: e61844ba5f58a3a01aa30b0ae8c2e229b5dc619a SHA-256: 65b89a12fbb8d8f8e1b2f74826f7582a028040d595dc3bd6d08c5f7953dd2945
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness, identifying the PDF as a phishing or trojan variant. The document functions as a link farm, with numerous URLs pointing to compromised WordPress sites and disposable domains, likely intended to lure users into downloading further malware or submitting sensitive information. No scripts were extracted, but the presence of multiple external URIs and the overall structure suggest a phishing or downloader attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://pistant.ru/uplcv?utm_term=xylem+and+phloem+coloring+worksheet PDF link annotation
    • http://firmykominkowe.pl/Obrazki/edytor/file/94352765932.pdfIn PDF document text
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef9c3d73f65850d0ff8918db9f293898/38643340805.pdfIn PDF document text
    • http://cateringkieuan.com/uploads/userfiles/file/37489507138.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1613289d51082d---vidunex.pdfIn PDF document text
    • https://www.hsbofmn.com/ckfinder/userfiles/files/93703494127.pdfIn PDF document text
    • http://radissonhoteltraining.com/userfiles/file/gadenigatotiso.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/firigorirubami.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/pazogegotonaramiw.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/meo9f41kd2n5jrlilk746q24kf/95562368785.pdfIn PDF document text
    • http://proreferee.ru/uploads/ckfinder/files/daxadapuzor.pdfIn PDF document text
    • https://fitnessrev.net/wp-content/plugins/super-forms/uploads/php/files/kebl4j34fid3tb257pbqpv7nm9/jibodi.pdfIn PDF document text
    • http://www.sevenchurchestour.net/seven/wp-content/plugins/formcraft/file-upload/server/content/files/160e3a7feaf142---gijemopetiwifif.pdfIn PDF document text
    • https://sg-design.top/wp-content/plugins/super-forms/uploads/php/files/b333593a097982f6b20b178c66eb3c44/sobamapixusowepidit.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/3752444234.pdfIn PDF document text
    • http://english-island.pl/wp-content/plugins/super-forms/uploads/php/files/1i1mgrfurf819q2vs7fpm6ccs5/wefasapuwokejutup.pdfIn PDF document text
    • http://xn--e1aazeoc7d.xn--p1ai/images/shared/file/83320528730.pdfIn PDF document text
    • http://jarosi.hu/files/file/vusanuruwebu.pdfIn PDF document text
    • https://2acontractor.it/images/file/nigotarorexebem.pdfIn PDF document text
    • https://xyoaa.org/sites/default/files/files/39089740792.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/beletek.pdfIn PDF document text
    • http://travelspace.pl/userfiles/file/zixivazezakigo.pdfIn PDF document text
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/35732351d7f453aadb1a782f882e9029/85777883815.pdfIn PDF document text
    • http://takeacode.eu/user/d41d8cd98f00b204e9800998ecf8427e/file/jokuzur.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/8h0p4hjdhhaogd3shulujbs8o9/virafugozefuraganizikani.pdfIn PDF document text
    • https://hoffmanowska.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607c01909fabc---vojiwezoda.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/42463602552.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_off0000ca4e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA4E 16428 bytes
SHA-256: 0075ce0c0a6c64f84e3bc75332648a36442753be0010e26c7677732e60412fb2
font_01_sfnt_off0000f45d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF45D 11260 bytes
SHA-256: fd0510d7d66f99615e9de092200e3b3407d1dc877d66c1dce8e14b1069e026b1
font_02_sfnt_off00010e62.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E62 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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