Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1a5692af685f8d8…

MALICIOUS

PDF

92.4 KB Created: 2021-07-07 09:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1ad549e927aac0c7fde8fca54112b4ab SHA-1: 35a146335011d796478a967c350095d1313e7313 SHA-256: e1a5692af685f8d8e3dd9aba11c0b27f8c385d06031106a8bf12582dcfd7a550
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 ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to numerous external websites, many hosted on potentially compromised or disposable domains. This pattern is commonly used for phishing attacks or to distribute further malware payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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://bobiniauto.com/userfiles/file/10018061063.pdf In PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/160867f9aeed7e---vakomexitamoduwoso.pdfIn PDF document text
    • http://vinhomeshaiphong.net/app/webroot/img/files/94664267600.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/525d5a957370250ea199231e368c354f/77283273673.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a21090cd2fb---94115151186.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/792070fd1fdced77bfbb5ebf7546cb94/wufudinokubaza.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/78456388265.pdfIn PDF document text
    • http://www.musicmaestrodiscos.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609b7e0926e9d---50994069499.pdfIn PDF document text
    • https://aadharshilaschool.org/userfiles/file/dubited.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/42911a57710011e600f6bde2d170febd/konev.pdfIn PDF document text
    • https://tehnol.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607af73c265e6---rugovuwano.pdfIn PDF document text
    • https://ak-oroslavje.hr/files/tulubem.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/0a08a0aae4f18f00ce56895e0fb9c570/26151414195.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/59651471754.pdfIn PDF document text
    • https://iamluno.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a046a8daa91---457841550.pdfIn PDF document text
    • https://ipcare.nl/wp-content/plugins/super-forms/uploads/php/files/74p8dj0lheaki7t0ue4h635chh/28485425350.pdfIn PDF document text
    • http://teplospectr.ru/images/files/fagevoraboxizu.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160846deab72af---33916144973.pdfIn PDF document text
    • http://sdtrafficticketlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/joparewixugaxematitoto.pdfIn PDF document text
    • https://www.cpro.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160705cc3d4dfd---33968963913.pdfIn PDF document text
    • http://www.photobreak.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1609d866416837---minumonazu.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/57dfb68fa7dd6d523c06d009b51d8d46/11366292408.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/29507038720.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=colony+surf+hotelPDF 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_off00010621.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10621 18120 bytes
SHA-256: 97eaea8e5895857964c4f840851cbbec23797650df684fc774eed272a302acef
font_01_sfnt_off0001351f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1351F 10304 bytes
SHA-256: 5b13d6efd99782f7109713f33e538381b852703551e675998b37fd92e8e49b35
font_02_sfnt_off00014c5f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C5F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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