Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4e2a58174d79806…

MALICIOUS

PDF

69.4 KB Created: 2021-09-09 07:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3caebb2c6dbe03837735a52bb446077d SHA-1: f58a233787e8a9d42ff251bc4d23fbd7e0f75824 SHA-256: c4e2a58174d7980609b32e0800a9c203a86f54db89b443415867209b5d70b60f
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, some of which are hosted on compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The presence of numerous links, including one that appears to be a redirector with a 'utm_term' parameter, supports the attack pattern of luring users to download further content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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 http://vibrobeton.by/pics/files/73481837768.pdf In PDF document text
    • http://hasyo.net/files/file/52668223937.pdfIn PDF document text
    • http://phunphu.com/userfiles/file/viduxogewudadikodemekos.pdfIn PDF document text
    • http://www.caslyn.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1613535f25a615---kedudu.pdfIn PDF document text
    • https://ewms.vn/wp-content/plugins/super-forms/uploads/php/files/2gaomfv1ijkct0k41ckanh9s93/wamebusokofomavi.pdfIn PDF document text
    • https://tjp2-hotlink-j3t.com/contents/files/99324422611.pdfIn PDF document text
    • http://xn--939a66v0zjo3bcvdmrp.com/data/ckfinder/files/22179223665.pdfIn PDF document text
    • http://arabstina.com/ckfinder/userfiles/files/lorulorelumupodizuzi.pdfIn PDF document text
    • https://ost-fogging.com/upload/files/zanexujekevepijaz.pdfIn PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161396e1a17050---60875505360.pdfIn PDF document text
    • http://www.thebetterinsurance.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135b2a0bc7ae---mejojipusog.pdfIn PDF document text
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/88870168908.pdfIn PDF document text
    • https://reazfarah.com/ckfinder/userfiles/files/deganojonezotonogura.pdfIn PDF document text
    • http://secoinblock.com/upload/files/71789900763.pdfIn PDF document text
    • http://sobinco.cz/ckfinder/userfiles/files/detifolapi.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • https://cbconsulting112.ca/userfiles/files/seruwe.pdfIn PDF document text
    • https://estudiowebcolombia.com/ckfinder/userfiles/files/xoboputozolerir.pdfIn PDF document text
    • https://nutstudio.it/userfiles/file/kawusedet.pdfIn PDF document text
    • https://dehaventransportation.com/home/de/public_html/ckfinder/userfiles/files/sozafex.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/61633302156.pdfIn PDF document text
    • http://gostinica-domodedovo.ru/files/wegenewedadobozumisip.pdfIn PDF document text
    • http://jeanthompson.nl/ckfinder/userfiles/files/74152891859.pdfIn PDF document text
    • http://historia-bfured.hu/userfiles/file/dakojivu.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/ab630436a0cefdf75a839ea79fe37216/71841917834.pdfIn PDF document text
    • http://globalcenterhotels.com/bot/ckfinder/uf/files/45594882591.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=gta+liberty+city+apk+download+androidPDF 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_off0000b2a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A3 14432 bytes
SHA-256: e7669e343868b052094ac8695902f08a219c58f40498ffdbab40dcd7127cf442
font_01_sfnt_off0000d6bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED4 10812 bytes
SHA-256: f5afbe5e67a7505372970cf7fc4fbc37723c78330cd5216af9663ccca2d5d9a1