Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d28cf5674a0fecd…

MALICIOUS

PDF

68.8 KB Created: 2021-09-24 16:00:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d772ad04d97156bdaeea14f2303cf2cd SHA-1: bba745455c0da0e02009d69e63876cb22d76cedb SHA-256: 4d28cf5674a0fecdcef4906abe6f316624ee1eeff60345e2048414172ab987f1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised websites and disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded URLs and link farm structure are consistent with an attempt to lure users to external malicious sites, likely as part of a phishing campaign or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wijnhuis-vaessen.nl/site/data/ws/files/51691221201.pdf In PDF document text
    • https://apc-algercentre.dz/ckfinder/userfiles/files/2896476169.pdfIn PDF document text
    • http://aeon-dev.com/uploads/files/202109021556272709.pdfIn PDF document text
    • http://drinkandshrink.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/161311f267f001---wigalut.pdfIn PDF document text
    • http://imhyuk.com/imhyukeditor/userfile/file/40320869920.pdfIn PDF document text
    • http://nhasachnguyenvancu.com/Images_upload/files/lugepijowufaker.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/zatuvokusuluwadojefam.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135752738452---94046531063.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/govoxurojofirowegilisajo.pdfIn PDF document text
    • http://52963566.com/upload/file/202109061750426915.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/serovajusizumiliwe.pdfIn PDF document text
    • http://uptindia.com/newsimages/file///lewopidese.pdfIn PDF document text
    • http://bndweb.nl/upload/files/45922061872.pdfIn PDF document text
    • http://fzcce.com/aimgs/uload/files/pibidikavogotibizenuzu.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/55969924764.pdfIn PDF document text
    • http://productinfo.in/konadnew/userfiles/file/molido.pdfIn PDF document text
    • http://tweedehandswikkelaar.nl/app/webroot/files/userfiles/files/77592994322.pdfIn PDF document text
    • https://ka-base.no/images_content/file/43928993303.pdfIn PDF document text
    • http://thefutureofgolf.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16135045c3e799---pukopaponidivafeti.pdfIn PDF document text
    • http://csc0512.com/userfiles/file/20210907095005_03pmff.pdfIn PDF document text
    • http://sangiorgioautoservizi.com/userfiles/files/nigesoguvesaziju.pdfIn PDF document text
    • http://karmakonnect.org/DrumiBhatt/karmakonnect.org/Final/ckeditorimage/files/2039686194.pdfIn PDF document text
    • https://osakaav.com/userfiles/files/36341869977.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/matujuzivof.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=face+swap+custom+videoPDF 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_off0000afbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFBF 14840 bytes
SHA-256: c3ff230dbbcbd5e2fd1fcfba2e622ba4ab951f70e28856add49179779e3ec6b4
font_01_sfnt_off0000d533.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD533 10656 bytes
SHA-256: ba53092d01c3cdce3b083f050ad35fb507cc9944d70b1c29d5d5f4ef70202654
font_02_sfnt_off0000edbf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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