Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dcb10a61ad66f21…

MALICIOUS

PDF

156.7 KB Created: 2021-07-21 23:11:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 84cf6983169e04456dcfe2a03a6c31ab SHA-1: 3ab7c4159a2537672b24c838f32282707ccab8ca SHA-256: 1dcb10a61ad66f2187da2629b2d7bca142d6d866414b38a40e01ae5289ce3ddc
156 Risk Score

Malware Insights

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

The ML classifier and ClamAV both strongly indicate this PDF is malicious. Heuristics identify it as a link farm, with many URLs pointing to compromised CMS upload storage and disposable hosting. The document body is unreadable binary data, suggesting it's not intended for direct user consumption but rather to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://soudurelauziere.ca/upload/editor/file/91964043603.pdf In PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/funigunerafuxisovawa.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/f5169ac3d4fd07b4a583bd7f34b76f79/posefax.pdfIn PDF document text
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/1314165ef7f477b3630ffce0b9d9db74/31893146985.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/2284802de10241cecc44e82a8689ad26/89085520178.pdfIn PDF document text
    • http://luingpyrex.cz/foto/Image/file/faxamaki.pdfIn PDF document text
    • http://anatolianlgs.com/userfiles/file/bonotela.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/41148068597.pdfIn PDF document text
    • http://phantasos.org/userfiles/file/46197297840.pdfIn PDF document text
    • https://www.espymetcalf.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ab5d9173470---kurumizexumafideve.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/24171560449.pdfIn PDF document text
    • http://www.pianoszimmermann.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608681a23c698---ziset.pdfIn PDF document text
    • http://cerescommoditiesltd.com/Images_upload/files/sikexu.pdfIn PDF document text
    • http://ebslang.net/_UploadFile/Images/file/vivatamekodewidazi.pdfIn PDF document text
    • https://nolimitscenter.be/peausitive/images/FCKeditor/file/61335654063.pdfIn PDF document text
    • http://www.petersmetalstitching.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16080e73b6e868---68440189108.pdfIn PDF document text
    • https://gullyracing.it/admin/ckfinder/userfiles/files/fefasuro.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/902f87535dc18490481596fa52d14028/11385337067.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609844073bfaa---wataxi.pdfIn PDF document text
    • https://rpdev.org/ckfinder/userfiles/files/ririwub.pdfIn PDF document text
    • https://allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/ef15788816356bba9591d1c829a3b5f9/pavoxozikabevuvolowi.pdfIn PDF document text
    • https://www.couleurs-et-jardin.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160c3a388ad935---liwototogaxaximajavodo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=out+the+top+switchbladePDF 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_off0001f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F341 26664 bytes
SHA-256: 94bd94952b85d7ca6133845b9574eaa5c6a932fc67c70f4c35d50a2288238571
font_01_sfnt_off00023391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x23391 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00024ba8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x24BA8 10756 bytes
SHA-256: 2c85a5cdbb6f5e1afd0508908703840872687c08b1f5a4e3bdf174ebcb798e2e

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