Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e3ad0f7a4c48e52…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 05:06:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 88ab0093433a1939794134d098cc5071 SHA-1: 92c61f6e06f7dfa1f3ed7acbb757c8816dccaa00 SHA-256: 0e3ad0f7a4c48e52d0ca41cb315f86ee7694373eeca34ab30e67bd61f5d34449
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains multiple links pointing to compromised websites, suggesting it is part of a phishing campaign. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that the sample leverages compromised WordPress upload storage to host malicious files. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://sgrdinstitutionspandher.org/sgrd/userfiles/file/33769862538.pdf In PDF document text
    • https://an-professional.ru/img/files/file/xegaligixonenofujisadokiv.pdfIn PDF document text
    • http://www.supair-lux.hu/ckfinder/userfiles/files/sosufek.pdfIn PDF document text
    • https://forkidsvietnam.vn/wp-content/plugins/super-forms/uploads/php/files/0d3q239107if2q289icp2hl480/69627467288.pdfIn PDF document text
    • https://www.themeshcowork.com/wp-content/plugins/super-forms/uploads/php/files/959169200df55825711729d23bcce660/81175238255.pdfIn PDF document text
    • https://selapro.com.au/application/third_party/ckfinder/userfiles/files/91667630612.pdfIn PDF document text
    • https://hotelpancharatna.com/assets/userfiles/files/gesokiravovewemenujopez.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/6ef851be9756ee81d9a511b2669c5f63/97766442548.pdfIn PDF document text
    • http://isvpro.com/custom/files/kufimuserazupekiru.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/fulonapobatunagabori.pdfIn PDF document text
    • https://kopari.hu/files/file/nogebaposab.pdfIn PDF document text
    • http://sntaviator.ru/ckfinder/userfiles/files/57120580490.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/71606940657.pdfIn PDF document text
    • http://hevolta.com/upload/file/merujekapo.pdfIn PDF document text
    • https://sitycare.com/FCK-UserFiles/files/51459311748.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/b47a256fc7cdd37e5200064a286d9cba/rikemibekirin.pdfIn PDF document text
    • https://cmsschoolkg.org/userfiles/file/51482757045.pdfIn PDF document text
    • https://ensasoft.com.tr/wp-content/plugins/super-forms/uploads/php/files/n4i7sriplo0rbe9pmk9gq9vce6/28631112188.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/14017709495.pdfIn PDF document text
    • http://tentimesneedlehill.com/UPFILE/userfiles/files/7617532781.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/6441411356.pdfIn PDF document text
    • http://akkoryazilim.com/userfiles/file/lefakiz.pdfIn PDF document text
    • https://floridainvestment.cz/files/file/fuminurofires.pdfIn PDF document text
    • http://physocare.com/Images_upload/files/16272271132.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a54494646cd---xoxeviromem.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=2019+kenya+census+job+application+form+pdfPDF 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_off0000d028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD028 11720 bytes
SHA-256: 77e25fa2dc55714dd00898f3b1ccbbd8ca90b5ac15041882f91bf6cb0a682226
font_01_sfnt_off0000ec05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC05 17116 bytes
SHA-256: f81311c45c9fb16ea511f785e8256c1b2aa675bc6685e04dff5f481aa308bc9b
font_02_sfnt_off0001183b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1183B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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