Malicious PDF — malware analysis report

Static analysis result for SHA-256 4dd7bb6634849ba5…

MALICIOUS

PDF

94.3 KB Created: 2021-09-10 16:49:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: dfacc0cbbf99bc1cf4dfe2d84695368a SHA-1: 4a633b69df6e1043e43b283669e323ed44fa713f SHA-256: 4dd7bb6634849ba52863ae26ccaccc04566e3fa24a34f62fa91cc9d2b5447cde
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier assigned a high probability of maliciousness. Numerous heuristics indicate the PDF functions as a link farm, directing users to various external URLs, many hosted on compromised websites or disposable domains. The presence of embedded URLs and the nature of the heuristics suggest the primary goal is to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://garglob.ru/uplcv?utm_term=inteligencia+comercial+pdf PDF link annotation
    • https://harshahometutors.com/uniformkontakt/userfiles/image/files/20387663356.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/4359222010.pdfIn PDF document text
    • http://precisionsurgicalworks.com/alpha/ckfinder/userfiles/files/vipebamewosomuj.pdfIn PDF document text
    • http://lachambredechos.com/userfiles/file/naxefumapise.pdfIn PDF document text
    • https://canoe.ro/Extras/ckfinder/userfiles/files/riluw.pdfIn PDF document text
    • http://brukikostka.pl/uploads/page/file/30217462232.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/97379059625.pdfIn PDF document text
    • http://nuovartea.eu/userfiles/files/30306090014.pdfIn PDF document text
    • http://absolutelyneon.com/userfiles/file/46018753614.pdfIn PDF document text
    • http://lactopad.com/uploads/files/8846089541.pdfIn PDF document text
    • https://swimproject.eu/wp-content/plugins/super-forms/uploads/php/files/5b219c8923c93de098eea7e9c61f4804/62944880281.pdfIn PDF document text
    • http://karinameal.com/imgdish/files/zolubil.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/70717326126.pdfIn PDF document text
    • http://goghepcacloai.com/media/ftp/file/rumorojixogadoj.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/92363952102.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/5175645205.pdfIn PDF document text
    • https://tsegypt.com/file/81561903148.pdfIn PDF document text
    • http://acmemask.com/upfiles/editor/files/905555412.pdfIn PDF document text
    • https://premiumvipbusiness.com/wp-content/plugins/super-forms/uploads/php/files/33ea9ecfe48f34c3f8fc609ef434a5e5/xaxudufaxowosu.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/nomenidawos.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16139578e0e433---jerabotivumolidorew.pdfIn PDF document text
    • http://www.cenlajobinator.com/siteuploads/editorimg/file/sabatusot.pdfIn PDF document text
    • https://fermuar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fed63f066e---90782369765.pdfIn PDF document text
    • https://aucordechasse.fr/vosImages/74418006564.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_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 18912 bytes
SHA-256: 22ecad8c780df659e29e8f059a20fc048c80d786dbdf764e4ebd13366014d36e
font_01_sfnt_off00013b2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15341 10744 bytes
SHA-256: c0b75d116458fa27661aa63b4246b723f1fbb5e2e741f1a33261617b0dff8624