Malicious PDF — malware analysis report

Static analysis result for SHA-256 41e88b6ce5e65e61…

MALICIOUS

PDF

73.6 KB Created: 2021-09-29 11:31:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 46f9fdf2fdc5de2d72d9821782bc56ca SHA-1: e58135246d73c733de71e26508817a8a4332a2b2 SHA-256: 41e88b6ce5e65e61eb380f857aa85459f7cd8f038204a17c92a2f1f520081008
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on compromised WordPress sites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware delivery. The presence of multiple external URIs and link farm heuristics points towards an attempt to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://laborke.ru/uplcv?utm_term=turbo+vpn+app+download+apk PDF link annotation
    • https://812423.qqtogeljackpot2.com/contents/files/bogusekaw.pdfIn PDF document text
    • https://clubkdo.fr/img/pics/files/13128031573.pdfIn PDF document text
    • https://silverbirdmarketing.com/pages/images/file/27483141961.pdfIn PDF document text
    • http://rm-centr.ru/uploads/file/sapaxegidupag.pdfIn PDF document text
    • http://language-coach.pl/uploads/files/sajojigivi.pdfIn PDF document text
    • https://taipeitccia.org/CKEdit/upload/files/10429140677.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/4cc0lro9glv5kmpv4ftms9dn4c/61834093296.pdfIn PDF document text
    • https://funstore.dialog.org/userfiles/file/5601555152.pdfIn PDF document text
    • http://jubileejec.com/userfiles/files/8585099642.pdfIn PDF document text
    • https://bokseinstituttet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/16153d4d9b0575---matipagojirixub.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/161357053021d0---noxisuj.pdfIn PDF document text
    • https://ycb.one/pro_pic/files/dovinupowabelutuke.pdfIn PDF document text
    • http://www.mueblesgamez.com/ckfinder/userfiles/files/tofelizamebovuvixuz.pdfIn PDF document text
    • https://anhhuynoithat.com/asset/files/90544849522.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/juxupotifa.pdfIn PDF document text
    • http://garderoba.sk/images/_file/niwodisofutoxanavifix.pdfIn PDF document text
    • http://charontrade.hu/data/file/21608699956.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/7655246263.pdfIn PDF document text
    • http://chanhungcorp.com/images/uploads/files/gajimebodowu.pdfIn PDF document text
    • http://nobody-films.com/bpms/includes/fckeditor_uploads/userfiles/file/zupevivugovarif.pdfIn PDF document text
    • https://softwebstar.com/shop/userfiles/file/37654923034.pdfIn PDF document text
    • https://jmcoverseaspvtltd.com/uploads/files/90657247010.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fe5bcb4a4e---sixogi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/j4udgulns1pecdh5kjuoc4e0aa/53198820902.pdfIn PDF document text
    • http://rimini-portal.de/bilderarchiv/file/nitumifusuzab.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_off0000ba1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA1D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 17584 bytes
SHA-256: 0ce0c8faf452a243d2490ad131971f6c8e0f803f409a11814b0b90bdfdc0f923
font_02_sfnt_off0000fffc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFFC 10340 bytes
SHA-256: 06fa213f2dd3b767cec7a9d32f169863e85b8508f0994e81d5e575f354c5e212