Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cb1176a12b7fd06…

MALICIOUS

PDF

79.3 KB Created: 2021-09-06 07:07:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: e21020569f2dc8ec88411072e614035f SHA-1: 164f2bf5a8d0dfac4555e6ed9a98d1d0a6573fb2 SHA-256: 5cb1176a12b7fd066ebbe12e938ade0ebd97b352f9b203809d55ce502b31fd21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous external URIs and is flagged as a link farm hosted on compromised CMS upload storage. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://archism.ru/uplcv?utm_term=sony+alpha+a6400+manual PDF link annotation
    • http://asesorialuishervas.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a884010a443---71062992578.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/41f3la2kedcneupvj2k1837vsg/basoroperederaw.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/d4e3286657aafa40802da3658b3b4084/78902366568.pdfIn PDF document text
    • https://patc.fr/imagesfile/56947071901.pdfIn PDF document text
    • http://www.tobywells.org/media/fckdir/file/kovetemajomumaw.pdfIn PDF document text
    • https://sweetestspaparty.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d177aad687---zaromuziwuvex.pdfIn PDF document text
    • http://webcertain.asia/contentupload/fckeditorUploads/organization_/file/kunisalegimagelogazebojur.pdfIn PDF document text
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/rdik04ndt5ofc1o2c51l14dbct/xidokurikaxemiroxiwisugu.pdfIn PDF document text
    • http://schouteninterieurwerk.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160714afdc198f---dibibotawa.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/14d688a941b1278678e8ab542e01334c/gelajoxiwunijotelovadeji.pdfIn PDF document text
    • http://kavtas.com/images_upload/files/39509647685.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/kesimixadabixaburi.pdfIn PDF document text
    • http://paintingservicesonline.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b30f2427e13---wikekosedovakevit.pdfIn PDF document text
    • http://www.highlandmetals.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16099d37c133e2---2858598788.pdfIn PDF document text
    • http://www.misshandicap.ch/wp-content/plugins/formcraft/file-upload/server/content/files/16080056d3d2dc---kujojirosegu.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/72df75909c378cf8a6625d9717e6bba4/60735093862.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a5c9948b44---rebaxufaviredikuledefe.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/a5dh788kjet9bu8l193na7vck6/99839143722.pdfIn PDF document text
    • http://photopuzzle.net/userData/board/file/sefavitevuwenigefuxo.pdfIn PDF document text
    • http://bezpiecznamlodosc.org/files/file/39030451410.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ec5ea9d6a3---77255676741.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/77966818675.pdfIn PDF document text
    • http://mimpishio1.com/contents//files/39304331059.pdfIn PDF document text
    • http://foxdigi.com/userfiles/file/44196587351.pdfIn PDF document text
    • http://www.kickcommerce.com/userfiles/file/ximetanasonosogilo.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_off0000d239.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD239 10584 bytes
SHA-256: 87ee5f86c9b07fdab47fe66b3fc59f9bd5f17525f0110df63700a7ed7b4d517b
font_01_sfnt_off0000ea3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA3D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001024f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1024F 17380 bytes
SHA-256: e690c55a4da0ced0263ce463314156e97f96c15b0f91eacefa09e7071d4ed508