Malicious PDF — malware analysis report

Static analysis result for SHA-256 56ea1be7e2b016fe…

MALICIOUS

PDF

84.1 KB Created: 2021-09-04 03:20:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 377433c78d8eea21e93235596febf373 SHA-1: 96ca2799ab6ec5b80d8398eca5a22d84d8eb5bdd SHA-256: 56ea1be7e2b016fe4a941a14a7ce765f10ef9aceb3f9c8b74ab47de993f4660f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple compromised or potentially malicious websites hosted on disposable domains. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it is designed to lead users to phishing or malware download sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://conwaychristian.org/wp-content/plugins/formcraft/file-upload/server/content/files/16115fa85a150c---torejetovofej.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/a31dd1ec887fa0b6eda20ff7e8ea0ac7/20545400582.pdf
    • http://hvpeds.com/upload/contents/file/tubemojunuvi.pdf
    • https://www.icslights.com/wp-content/plugins/super-forms/uploads/php/files/83c8b335b105bd86f51850a016f4a6b6/68702447082.pdf
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/dosizebe.pdf
    • http://braciszewska-klimek.pl/fck_files/file/35463643130.pdf
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/609bd9ead3a7570bac5655deb0a06ec1/59536559932.pdf
    • http://sunarfactory.com/userfiles/files/11374918503.pdf
    • https://saikekanglun.com/filespath/files/20210821010534.pdf
    • https://proxus.nl/file/rufeluzovexuw.pdf
    • http://union.travel/ckfinder/userfiles/files/1661706121.pdf
    • http://teplo76.ru/uploads/file/26647483213.pdf
    • https://valeaflorilor.ro/img/uploads/file/gobakikimive.pdf
    • https://aquafilling.com/userfiles/file/89129199203.pdf
    • http://daugiavanthienphuoc.com/media/ftp/file/sobuku.pdf
    • http://emilygrilltogo.com/uploads/files/wetizapilugu.pdf
    • https://hotellemaritime.com/hotel/upload/files/16924699150.pdf
    • http://minhanh.com/files/28532884955.pdf
    • https://tectrongim.com/uploads/files/bojitotorav.pdf
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/bebux.pdf
    • http://lindseyderence.com/userfiles/files/85932095408.pdf
    • http://vnndt.com/Images_upload/files/22905990916.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/71fa9e8f3e1cc65f6d000219aaf63d5e/99162366043.pdf
    • https://tedvandergulik.nl/userimages/file/xepedezorivebaxeti.pdf
    • http://aquatrustfina.com/userfiles/file/tunaf.pdf
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/3e33a491fb3f42884fff89d050b1f1fc/wakusaxagenunov.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=prezi+download+as+pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e535.bin
517f4c45ad3d8ee415562f76158f3820042775903e33fa27b1c81b8439b822a0
pdf-font-stream PDF embedded font (sfnt) at offset 0xE535 17408 bytes
font_01_sfnt_off0001125c.bin
1674c2ec0bbac8aa7cc6fb58d5cbe33a921d1dbc7cca7950d89e28ad85943318
pdf-font-stream PDF embedded font (sfnt) at offset 0x1125C 10540 bytes
font_02_sfnt_off00012a91.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12A91 16792 bytes