Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fe4289f442eacea…

MALICIOUS

PDF

90.9 KB Created: 2021-08-25 02:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: 70be474e549b6f02721093e6b1be4ed6 SHA-1: f6b2826ff5ab46158112d61d8951db3daf6d4e0b SHA-256: 4fe4289f442eacea4dacb9eee79431325d18a7d2ecb60e896227489a9d5f18e9
156 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed for malicious redirection. The ClamAV detection and ML classifier strongly suggest this PDF is malicious, likely serving as a lure for phishing or malware distribution. No scripts were extracted, and the document body was unreadable, so the attack pattern is inferred from the URL structure and heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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://mispuntossaga.com/campannas/file/guvegixemetaj.pdf In PDF document text
    • http://ccforum.kr/uploads/file/1627848612.pdfIn PDF document text
    • http://eiak.org/upload/editor/files/32349084734.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078d977eeb43---51957815881.pdfIn PDF document text
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/6m4bnkf3oonic4kufbj1jolns1/98017240392.pdfIn PDF document text
    • http://matchedtubes.de/userfiles/file/guponot.pdfIn PDF document text
    • https://www.coconutlodge.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7539600cda---65535906325.pdfIn PDF document text
    • https://na-nule.ru/wp-content/plugins/super-forms/uploads/php/files/4b0hqa7spugmp9cdd0v693o8f3/bobapojerajidufesuw.pdfIn PDF document text
    • https://www.servicioscalibrados.com/wp-content/plugins/super-forms/uploads/php/files/b619480a4aa20d81dd08b71ccd49a846/55696625867.pdfIn PDF document text
    • http://malbreil.com/userfiles/file/26766956920.pdfIn PDF document text
    • http://hyundai-dongdo.vn/images/files/77831905548.pdfIn PDF document text
    • https://minutesnap.com/wp-content/plugins/super-forms/uploads/php/files/075f0520ed86f37be87d7a375c56851d/jusomoxotowoxu.pdfIn PDF document text
    • http://jingyilin.org/uploads/file/2041617069.pdfIn PDF document text
    • http://eksan-ltd.com/userfiles/file/89939775197.pdfIn PDF document text
    • http://itemclinicchina.com/ckupload/files/75648383106.pdfIn PDF document text
    • https://xosobacninh.vn/webroot/img/files/jujivenibemu.pdfIn PDF document text
    • http://clinicoral.com/img/userfiles/files/78189185855.pdfIn PDF document text
    • http://k-yoga.org/file_upload/spaw_upload/file/20210728003702.pdfIn PDF document text
    • https://bestmiamiturf.com/wp-content/plugins/super-forms/uploads/php/files/a8002ef00d8a4be7f19db4de93ad9383/10505188403.pdfIn PDF document text
    • http://romanakladatelstvi.cz/userfiles/file/4624162021.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/jotiser.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/94065484061.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/160941133dcb48---60934689504.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/3feec0962a830a5563fb7ec3a892ec53/xozarusif.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=bacterial+transformation+pre+lab+questions+answersPDF 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_off0000fc6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC6F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011486.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11486 11168 bytes
SHA-256: 8f6832e0b7c470aa456ae8b2afd4505e3e5db558323aeb0243533d88208a04b0
font_02_sfnt_off00012e74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E74 17560 bytes
SHA-256: 2455ade9cf9d60173e92f90ec9dcfda768269613ea24ee90779c833b102cf672