Malicious PDF — malware analysis report

Static analysis result for SHA-256 e757bedd217b029a…

MALICIOUS

PDF

92.4 KB Created: 2021-08-11 12:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-17
MD5: eaf17f981a5c0865f70f6373537fabff SHA-1: bc62024f39b3a944213991d1e8918c8c8cb37ec1 SHA-256: e757bedd217b029a6d0b2f5ce7141b7fc3e2cebaba7bb35d8aaad56015447f45
156 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, indicating a link farm designed to redirect users. The presence of external URIs and link farm heuristics strongly suggests an attempt to lure victims to malicious sites for further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://jedwines.com/cmsCart//upload/file/tatazupanudagiwakow.pdf In PDF document text
    • http://tomlitkom.ru/ckfinder/userfiles/files/situtikovobevonaz.pdfIn PDF document text
    • http://sklepjola.pl/userfiles/file/bedemojikonupubamet.pdfIn PDF document text
    • https://daluxerealty.com/wp-content/plugins/super-forms/uploads/php/files/cjqq7q96ksgop3ulmne7bvpmr7/62727435556.pdfIn PDF document text
    • https://hondamienbac.vn/userfiles/file/85842625518.pdfIn PDF document text
    • http://amctop.com/board_data/editor_img/file/202105082209.pdfIn PDF document text
    • http://cgpreceptor.com/ckfinder/userfiles/files/xotemevupomutefafeno.pdfIn PDF document text
    • https://afriqueitnews.com/wp-content/plugins/super-forms/uploads/php/files/428d9a74fdec9af74cc1de7c77172e7f/96793390410.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/70d249727738c81865de249b005bfd8d/tatavened.pdfIn PDF document text
    • http://coffee33.ru/archive/file/50840559080.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/f1d2a1b9cd89740c3bcc45623753932c/32995666290.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdfIn PDF document text
    • https://livredart.com/ckfinder/userfiles/files/zabudonekumix.pdfIn PDF document text
    • http://canigrup.com/userfiles/file/bakokejisiwujezipiloraz.pdfIn PDF document text
    • http://renovfab-menuiserie.com/userfiles/file/gukerugifuwob.pdfIn PDF document text
    • https://slide-bearing.com/d/files/tirotopukejalejosidumaw.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d4b41f551b2---kusobipavotibur.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/fc7a9ecab85b8bc5d90b80a7cab09516/digefogifedi.pdfIn PDF document text
    • https://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/84d90ef438380d67d299aa422714e670/66203236101.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/m4lsokgm36t68b5am8pv2hs333/59925190257.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/72174e59469a17ab830697d2a958c3b8/zovaparapenabaju.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d6e56c04d67---94960547689.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/69465596119.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=mobile+legends+mod+apk+unlimited+money+and+diamond+anti+bannedPDF 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_off00010477.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10477 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011c8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C8E 11072 bytes
SHA-256: 1916b39d7e1a58126bc8f2488139a3159b86200e300ea9dd1dbc7ae8530e5911
font_02_sfnt_off000135f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F3 17368 bytes
SHA-256: 4a7f45a3f260dce3196f579daf19068f1d50dfc96804094dd2e96a3a62a766a2