Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2727b0939bc1c9a…

MALICIOUS

PDF

78.2 KB Created: 2021-08-18 11:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6556bc3d99a32fe2a1998c2716b229e7 SHA-1: b74242393c6082f96f7a7fa00a81ab6166b77983 SHA-256: c2727b0939bc1c9a07938380c359be6b60bd64426f5c9cabdac2f5f7d7c5eafe
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to disposable hosting and potentially compromised WordPress sites. These links likely serve as redirects for phishing or to download further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/lvvanfs9r7ov9qil9cl30h90k3/mabapipugodejogutakiwi.pdf In PDF document text
    • http://fitnessklub-impuls.pl/uploads/assets/file/vikud.pdfIn PDF document text
    • https://fruzsiflame.hu/userfiles/file/xawiliza.pdfIn PDF document text
    • http://dighakanchaninternational.com/FCKeditor/file/fepimiko.pdfIn PDF document text
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/j8l2i1figcib02sb7cj6l04jof/sevaxadipepujo.pdfIn PDF document text
    • https://best-turbos.com/wp-content/plugins/super-forms/uploads/php/files/a69ba8fb86910f51f590f2da198383b7/sesigijirisuvevo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e97d28c3aa---51581565452.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609bf9c7059d3---83130007736.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/d4d7e9acd2a6d22dc849000c558d8a8f/wiwininamezojo.pdfIn PDF document text
    • https://www.tai.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1607080cd58b15---63004682767.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/ed7c32984c1575f6613a7ae180bc8815/sogoduwopuxoxupa.pdfIn PDF document text
    • https://nestaerospace.com/uploads/file/guzafit.pdfIn PDF document text
    • http://dentish.ru/ckfinder/userfiles/files/pawewa.pdfIn PDF document text
    • http://achilleferolla.it/userfiles/files/14245128466.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/54190f5624033a18de18e066728125d8/terasefaro.pdfIn PDF document text
    • http://serramentisiciliano.it/userfiles/files/jejefefipuzi.pdfIn PDF document text
    • http://alliance-ic.ru/uploads/file/kalozisivofodaxeba.pdfIn PDF document text
    • https://www.urban-quartz.co.uk/wp-content/plugins/super-forms/uploads/php/files/149fb34686313b11a49659e1933f63af/9097176487.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/e5ou97hgr8j2iuec16ko188rqg/51164855139.pdfIn PDF document text
    • https://lightingsystemscol.com/wp-content/plugins/super-forms/uploads/php/files/e96f2b78a1743369e39200d7845659d9/10898462450.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071832257009---80454504446.pdfIn PDF document text
    • https://englewoodgrassfarm.com/wp-content/plugins/super-forms/uploads/php/files/e91eb63a0d44cb2bdaa560695110dee5/bikuzabedesoluwi.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/sutipuzexanat.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=sopa+de+letras+de+matematicas+para+secundaria+para+imprimirPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/58786585969.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_off0000cbde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBDE 17148 bytes
SHA-256: 0d1435ac5415f1be9576eb8a468b24f9dc800fdd4a58b9aa686b7451b0020e80
font_01_sfnt_off0000f745.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF745 10848 bytes
SHA-256: e4d907032898bbae0ebbf3c83170a7c3f0b557d5fd3b25266251c46428a3c0c1
font_02_sfnt_off00011046.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11046 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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