Malicious PDF — malware analysis report

Static analysis result for SHA-256 93bfdadba1636218…

MALICIOUS

PDF

96.1 KB Created: 2021-07-04 21:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 29771e148ed111ef05f8b7e1eef2c839 SHA-1: 2937f1ec883679f8534bc3021248d592737d954a SHA-256: 93bfdadba1636218c8897679f57ccf23c428b766340685f8508f18196eca82ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure and URL patterns indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://irlanc.ru/uplcv?utm_term=6+month+old+not+sleeping+through+the+night
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16098ad4114654---ginemaremalosojol.pdf
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ef59fd0ca245aac15aa4e32d107692e8/gezovesim.pdf
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/8cd4ffad809eacc1965d62c193ffe193/vulavazafefipugebizodikik.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfa853da94d---wijevej.pdf
    • https://home-consult.lu/userfiles/files/86708511111.pdf
    • https://kindliving.org/wp-content/plugins/super-forms/uploads/php/files/tmp/salifibunidobeloxuto.pdf
    • https://perfecthospital.net/FCKeditor/file/63751887208.pdf
    • http://renovfab-menuiserie.com/userfiles/file/5492078718.pdf
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/8p28lotdr52npr26fq3gdiq7k8/fufir.pdf
    • http://cosmik-kino.ru/sadm_files/gatow.pdf
    • http://run2endalz.org/clients/2/2b/2b4973775a35d8819257a28a16fdea67/File/rivugebegujawuxodifaxiz.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/9d901ef61233ddc60053a0de4ffcd3f3/17921009761.pdf
    • https://www.sussexweddingservices.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16085be01a5b79---bubozonexil.pdf
    • https://agilitynd.com/wp-content/plugins/super-forms/uploads/php/files/0d9372f4f62823d14f4bf0652e9194b5/tuwaveda.pdf
    • http://asbufestival.com/uploads/FCK_files/file/fidalulabozopu.pdf
    • http://glenbrooksouth1970.com/clients/1/17/17fc1bd13d5538a69f39d58c869d2fc5/File/fuvavamepesumoku.pdf
    • http://faw-asia.com/image/upload/files/xosegoda.pdf
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/aeb913625fa0c484c19ae901d582dd60/wulatego.pdf
    • http://banning64reunion.com/clients/a/a7/a71e9339640f4be667ed55590a288245/File/91005475256.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16081cd38df927---busokifojitim.pdf
    • https://datatech-int.com/userfiles/file/23982431033.pdf
    • https://rintrans.com/files/filopogat.pdf
    • http://beachfirebrands.com/userfiles/file/funofenazurok.pdf
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cc7fed08a4b---maxajenofuligisixupini.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_off000115dc.bin
57657fa2c87e37334740b5971f70352b1ae1210788bbb355f43db59531c04a87
pdf-font-stream PDF embedded font (sfnt) at offset 0x115DC 10848 bytes
font_01_sfnt_off00012e6d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12E6D 16792 bytes
font_02_sfnt_off0001467f.bin
f6011be178b461adfa1dc29b3453050988207e955964030e6aa84b18af6c7968
pdf-font-stream PDF embedded font (sfnt) at offset 0x1467F 16912 bytes