Malicious PDF — malware analysis report

Static analysis result for SHA-256 c665dbc3d456c141…

MALICIOUS

PDF

82.5 KB Created: 2021-09-20 11:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3371411d46131adb4c950002fef67160 SHA-1: f1484ca10b332037e660485d0f25aca84551d899 SHA-256: c665dbc3d456c1415a41f30b905b04d96beb147f2dfaaa335ee769564220fc61
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a phishing lure, employing a deceptive download button and hosting numerous links on compromised CMS uploads and disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to trick users into downloading further malicious content. While no scripts were explicitly extracted, the presence of multiple external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggest a campaign focused on redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://allytemp.ru/uplcv?utm_term=war+room+full+christian+best+movie PDF link annotation
    • http://jhdjt.com/images/upload/File/loxogen.pdfIn PDF document text
    • https://hobbes-group.com/upload/files/nafavadudalajeduxigatef.pdfIn PDF document text
    • http://urgentcarepb.net/userfiles/file/84410728609.pdfIn PDF document text
    • http://neodev.space/wp-content/plugins/formcraft/file-upload/server/content/files/16138fc29ee919---diwefuxurofu.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0c5ee20b9---vonanujenuxivutuvow.pdfIn PDF document text
    • https://ducthai.vn/userfiles/file/93571579904.pdfIn PDF document text
    • http://jucal.es/images/file/gikasejiwuxalenukos.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1612ee0c33c803---baxikivumodipisurekagini.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/u03ptfp07ajukvcjk2729ogd73/zinidaliwaritedaxiduduwu.pdfIn PDF document text
    • http://siripanyalamphun.com/user_img/files/56578731057.pdfIn PDF document text
    • http://vrzion.com/data/userfiles/files/dexikowodipagabaj.pdfIn PDF document text
    • http://tfe-design.dk/userfiles/file/silit.pdfIn PDF document text
    • https://lecachet.fr/docs/files/71605455459.pdfIn PDF document text
    • https://bharatiyabhashaparishad.org/ckfinder/userfiles/files/11528153958.pdfIn PDF document text
    • https://cursosadistanciayonline.com/medios/files/17229319037.pdfIn PDF document text
    • http://lamexmarket.com/uploads/files/nazode.pdfIn PDF document text
    • https://impulsa.mantareys.net/uploads/plantillas/files/20077061218.pdfIn PDF document text
    • http://omniatel.it/wp-content/plugins/formcraft/file-upload/server/content/files/161413cc8b0827---74945008335.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/senowodaturuwom.pdfIn PDF document text
    • https://lcd96.ru/wp-content/plugins/super-forms/uploads/php/files/edaf2c2188183739cbcd28984ae2501f/22255957397.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/31444399055.pdfIn PDF document text
    • https://www.spitalmoldovanoua.ro/ckfinder/userfiles/files/60200024349.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_off0000debc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBC 10900 bytes
SHA-256: 7277d614ed524b6ff07880e93248e7197b2e3948b52274841f029481fd123515
font_01_sfnt_off0000f7cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7CF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010fe1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FE1 17184 bytes
SHA-256: 0734c1caf512700014ab50dbb5c6caac522267b9a40ce0a54147b5ba972a29e2

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