Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee352f87c96830f…

MALICIOUS

PDF

83.9 KB Created: 2021-09-18 23:25:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7f1d9c375d26f113891319d1e5b87292 SHA-1: f70b09c4c838fe4597dc4b2aa5443aed17fd8970 SHA-256: 4ee352f87c96830f4fed985a3b821ed338e4abfaec28cc97ad36907c46f71cbe
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Static analysis reveals it functions as a link farm, containing numerous URLs pointing to various domains, many of which are associated with compromised CMS uploads or disposable hosting. The presence of 'utm_term' parameters in some URLs suggests a potential phishing or spam campaign aimed at directing users to specific content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=a+course+in+cosmic+consciousness+pdf PDF link annotation
    • http://otelm4b.ru/admin/ckfinder/userfiles/files/ginikibafet.pdfIn PDF document text
    • http://avon-bratislava.sk/files/files/liwoxekalu.pdfIn PDF document text
    • https://hongmao.tw/uploads/files/202109061952004289.pdfIn PDF document text
    • https://www.entornopublicitario.com/wp-content/plugins/super-forms/uploads/php/files/b30e2ef2804d9b7b24c569673ba76060/kidumovobazofeti.pdfIn PDF document text
    • http://artospace.com/pics/file/81298656518.pdfIn PDF document text
    • http://sushiyaslo.com/uploads/files/50107567200.pdfIn PDF document text
    • http://dydlhx.com/upfiles/file///55809080971.pdfIn PDF document text
    • http://work4shop.cz/userfiles/file/58839216673.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/kelutasefozasiguzupab.pdfIn PDF document text
    • https://alev.az/userfiles/file/82119446969.pdfIn PDF document text
    • https://ap-qatar.com/userfiles/files/baxomefovegofelijixos.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/161328baeb7879---6460692139.pdfIn PDF document text
    • https://malmospelmanslag.se/userfiles/file/lijonudotek.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210905_203149.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613cecd7530f0---36510928386.pdfIn PDF document text
    • http://pastadimatteo.com/ckfinder/userfiles/files/41070253447.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/7478b4abe8ef1ff8f7df53069ccca5fc/42890371568.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/81234908533.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/60548237001.pdfIn PDF document text
    • https://lllk.ru/wp-content/plugins/super-forms/uploads/php/files/cf874e8855baea28d79a15231fd9ee58/75078188.pdfIn PDF document text
    • http://baheth24aqari.com/ckfinder/userfiles/files/xugifozopajozat.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/75497109475.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/fumimurageg.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/8a43648c78ca62e45beb3f2e1707dc6c/71701226379.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_off0000e138.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE138 10556 bytes
SHA-256: f662f37cb68eba02d4bbc24502f78ed866af97c6fed906f3e73ef3cb4762f467
font_01_sfnt_off0000f93f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF93F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11151 18312 bytes
SHA-256: 4b34657a1d7c5af3a6e8a42a4fbe0f612a510881ae3c73eacadaf78f9aeea16f