Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dab29050270df48…

MALICIOUS

PDF

77.7 KB Created: 2021-09-23 12:07:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0db7c7382930e5505799da20beaf5875 SHA-1: 9b3f404aa1da85587f1c459d1c1ef998af7998af SHA-256: 9dab29050270df481ec35bf57eb28383696611aeb1290908113205b4ed35974e
164 Risk Score

Malware Insights

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

The PDF contains numerous links to other PDFs hosted on compromised websites, indicating a link farm designed to distribute malicious content. The presence of a 'download button' lure and ML detection further supports a malicious intent. The ClamAV detection as 'Pdf.Phishing.Trojan' strongly suggests a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

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 http://www.goldenlantern.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/161368fd020121---ruridon.pdf In PDF document text
    • http://cs-golfclub.com/ckupload/files/rudazuxiga.pdfIn PDF document text
    • http://ltptech.vn/uploads/userfiles/file/rijufududozelesosa.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109011517233145.pdfIn PDF document text
    • https://bengalroys.com/ckfinder/userfiles/files/dogafinajefixeda.pdfIn PDF document text
    • http://vet-spb.com/userfiles/file/juligoninifapipekikavowu.pdfIn PDF document text
    • http://awfiowv.love-mrt.com/upload/files/simotirakabipug.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/ludutozewebomanufa.pdfIn PDF document text
    • https://weilaimachinery.com/userfiles/files/sagubajagedaxukupen.pdfIn PDF document text
    • http://esipro.be/userfiles/file/60907610564.pdfIn PDF document text
    • http://packturf.fr/files/48060066685.pdfIn PDF document text
    • https://underworldgear.com/admin/images/fckImg/file/94842330653.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612f729eb9d92---folel.pdfIn PDF document text
    • https://dukupahit.com/contents/files/nifogamop.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/57780995879.pdfIn PDF document text
    • https://maconlux.ovh/userfiles/files/28853968749.pdfIn PDF document text
    • http://99hospitalitygroup.com/ckfinder/userfiles/files/dazudupoloro.pdfIn PDF document text
    • http://viral-list-machine.com/ckfinder/userfiles/publics/files/gurabijezapegudojanevafig.pdfIn PDF document text
    • http://sangtaoad.com/uploads/userfiles/file/felezaxa.pdfIn PDF document text
    • https://rdw-wolf.de/backend/ckfinder/userfiles/files/74755658751.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/66100tmjjg8gv8gjtsqet8ok1s/55725009745.pdfIn PDF document text
    • https://delta-relay.be/userfiles/file/nifabakojelituvu.pdfIn PDF document text
    • http://buddhavihara.net/userfiles/file/xabimozenamogak.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614c168357a6b---65451779399.pdfIn PDF document text
    • http://3gr-group-com.gbintl.com/ci/userfiles/files/najabeb.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/fudonebe.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=wwe+immortals+mod+apk+iosPDF 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_off0000cc64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC64 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e47b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47B 10620 bytes
SHA-256: 53d45ef1f4f093de0731d622b6b94b05f66f1fb5bdfff5630b2c95bd9308ab79
font_02_sfnt_off0000fccf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCCF 17176 bytes
SHA-256: d4d15836faedbc6d4bb88c1b7adb2f8a3aca09bfe4339780ceb18b3469562e9a