Malicious PDF — malware analysis report

Static analysis result for SHA-256 e359d01be8078f11…

MALICIOUS

PDF

70.7 KB Created: 2021-09-05 11:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 6d7e87fc36571b48afe9cf50ac495164 SHA-1: 58c9c1a5615187dc04aed7372e7bf984037515e4 SHA-256: e359d01be8078f11b1d1069a4dcc5572147a8d3f59b31cb224a83d17bf070548
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains numerous embedded URLs that point to various websites, many of which appear to be compromised WordPress installations. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for these links. ClamAV detection and ML classification strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the primary attack vector appears to be the extensive link farm designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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://krisoc.ru/uplcv?utm_term=magic+words+200+pdf PDF link annotation
    • https://gmonlinestore.com/wp-content/plugins/formcraft/file-upload/server/content/files/16128f2e2ce0f4---17937324850.pdfIn PDF document text
    • https://www.mclarenpress.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc9062fb40---15973599996.pdfIn PDF document text
    • https://mimpidia2.com/contents/files/80833979970.pdfIn PDF document text
    • https://teenvolunteerhouston.org/wp-content/plugins/super-forms/uploads/php/files/e8e011426017d0b66d785e3eb220b3ba/25776930888.pdfIn PDF document text
    • http://xn----7sbqwxdbhblh2h.xn--p1ai/data/file/jepavukaguvafakupux.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/b29c948682c48f4000a63e3df8c766ac/gisunenulasije.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/cd4c4892f83301240332aa0b75ab9939/3830290387.pdfIn PDF document text
    • http://businesslegalgroup.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/16348646991.pdfIn PDF document text
    • http://frchem.cn/upload/files/zivulu.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607e42ce5bcd0---22132115691.pdfIn PDF document text
    • http://ndt-tl.ru/upload/file/37900255944.pdfIn PDF document text
    • http://xn--l3chcucnqd9c0eua7b1k.com/user_img/files/52250365566.pdfIn PDF document text
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16077f1bf8ab29---36361082711.pdfIn PDF document text
    • http://140.121.125.49/ckfinder/userfiles/files/20210817_155543.pdfPDF link annotation
    • http://impressivetravelvietnam.com/upload/files/bososodefi.pdfIn PDF document text
    • https://ontime-taxi.kg/wp-content/plugins/super-forms/uploads/php/files/d1d45687f0e1500b641ff90d7b4a0f9f/28065796883.pdfIn PDF document text
    • http://npk-bypassdrr2.com/file_media/file_image/file/dudepixuxidibodula.pdfIn PDF document text
    • https://by-express.com/upfiles/editor/files/89316252842.pdfIn PDF document text
    • http://upoart.com/ckfinder/userfiles/files/dizefuvunuxiwifam.pdfIn PDF document text
    • http://thingsantiquesla.com/userfiles/files/wixezobokoxawep.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/6a0d4f7cabfe051ee1794ac77d1a41dc/35728504844.pdfIn PDF document text
    • https://mindweave.co.uk/wp-content/plugins/super-forms/uploads/php/files/4elab88tak9knp8iarntolgk2j/vodujodejuzekodebo.pdfIn PDF document text
    • https://zzwgjx.com/d/files/sofevopasunajoxuroj.pdfIn PDF document text
    • https://cpsguffanti.it/uploads/file/lopozukew.pdfIn PDF document text
    • http://claudiodauelsberg.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16079fec18b70c---9336711986.pdfIn PDF document text
    • http://thaisomboonautopart.com/userfiles/files/pulubepupasupozej.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_off0000b4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4FF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD16 10736 bytes
SHA-256: 91e83a05342b760faa10b496279bab3223059212737f0eae93d807d3f4545033
font_02_sfnt_off0000e5c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5C7 15732 bytes
SHA-256: 6e949a2b6b9ca5fdd92c042d0301554448b570f6748f09e8259db5b230e21bc5