Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4cd28ec2b1c26c4…

MALICIOUS

PDF

104.9 KB Created: 2021-09-02 20:45:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: b507ee17b120fec956d16682e16d66e1 SHA-1: 3630edf97e0835be221a9748e6fbea6e7f136b9f SHA-256: e4cd28ec2b1c26c41d523b8a8aa76c590096605040e2ec47a88dcba459aaf7a1
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, pointing to multiple compromised CMS upload locations, likely to host and distribute further malicious content. The 'Password-protected archive handoff' heuristic indicates the document may contain instructions or a password to decrypt a payload, a common tactic to evade initial security scans.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://www.johnknox.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160cff36e90730---49471259407.pdf In PDF document text
    • https://minlinart.com/archive/upload/files/lafunatesavilomufun.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/f4fabd401b1482c98aef6dbe3fd041a5/waropufipikevu.pdfIn PDF document text
    • http://galgalesh.com/userfiles/file/wexanejatikiz.pdfIn PDF document text
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/56d55mtij2orp5gnvhdmq0fq89/45335542212.pdfIn PDF document text
    • http://itaindustrial.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dd843eb1684---dewemizaxumomijumarusu.pdfIn PDF document text
    • https://chicagoportablexray.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a2416b86130---61082007791.pdfIn PDF document text
    • https://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/dee42373ecd03673ce1dd2cc3314238c/tusewutaruvubut.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/91160375318.pdfIn PDF document text
    • http://limeitec.com/upfiles/editor/files/77003364447.pdfIn PDF document text
    • http://gaskinfamilyreunion.com/clients/b/b7/b798c9f9e2af69c3a5b950a06e4ade8e/File/20944076697.pdfIn PDF document text
    • http://www.ufolep-69.com/contenus/files/52231074243.pdfIn PDF document text
    • https://ozmutludokum.com/userfiles/file/bazivete.pdfIn PDF document text
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/31948324111.pdfIn PDF document text
    • https://olterus.com/contents//files/bojigatig.pdfIn PDF document text
    • http://dongshengcable.com/images/upload/File/50972237001.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161040e6ac493e---badokutiferudij.pdfIn PDF document text
    • http://bienbao.org/uploads/files/nodopadunezodafikip.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4d840e8fef---61034380366.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bupiwamilopuferijis.pdfIn PDF document text
    • https://tagoproperties.com/ckfinder/userfiles/files/5106670917.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/konukezab.pdfIn PDF document text
    • http://boxerdapolenta.com/cmsimple/images/file/wakowumopovolefuroligo.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1611fbffe0230d---86177153485.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=t%C3%A9l%C3%A9charger+fichier+pdf+en+lignePDF link annotation
    • http://pro.ovh.net/~tribuene/images/banque/file/16762108629.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_off00012e65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E65 21064 bytes
SHA-256: d855fda5b0a6b57deefd93a9cc7758345d6dc291c37e245b1e2d72f70c70a6ab
font_01_sfnt_off000163ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163EC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00017c03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C03 10632 bytes
SHA-256: 7a38a0ef00736e714659ff7139c876bcce92d69ec4bded8446652cb3fb0b17c0

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