Malicious PDF — malware analysis report

Static analysis result for SHA-256 edf9dc03aaff15da…

MALICIOUS

PDF

70.7 KB Created: 2021-09-13 18:25:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 9ce5d9fc0d67bf00d7953f7be1e1e626 SHA-1: 3b384e543d5f8be0dc8cc2443a3a9d66f7f09ef0 SHA-256: edf9dc03aaff15dac9603ce079871e0006b048447fadc57189a45671008346c8
156 Risk Score

Malware Insights

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

The sample was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier as malicious. It contains numerous links to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The primary purpose appears to be directing users to potentially malicious external sites, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://jin-ji.com/upload/files/ruzedijoregova.pdf In PDF document text
    • http://kompassztuki.pl/Image/files/rigonog.pdfIn PDF document text
    • http://www.cuerpomenteyespiritu.es/wp-content/plugins/formcraft/file-upload/server/content/files/16134256e056b3---49043565659.pdfIn PDF document text
    • http://tcihk.com/userfiles/28535291477.pdfIn PDF document text
    • http://norrlandet.se/userfiles/file/jusokurosebunavidike.pdfIn PDF document text
    • http://cuoredicane.it/userfiles/files/73100873129.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/zogodidubixo.pdfIn PDF document text
    • http://studiosiriosrl.it/userfiles/files/9730963756.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/90847967607.pdfIn PDF document text
    • http://shardamedicalstore.com/singhania/downloads/file/34087018373.pdfIn PDF document text
    • https://shiokuda2.com/contents/files/55025333919.pdfIn PDF document text
    • http://0vote.com/ckfinder/files/jezamerodesujekujav.pdfIn PDF document text
    • http://bortran.com/upload/image/file/20210906023353.pdfIn PDF document text
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/gupejumivov.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///lumowavazixugalewutuzigep.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613efebc0c6ac---zonuwuzakenemapagopo.pdfIn PDF document text
    • http://xn----ftbkdcamitb5h.xn--p1acf/files/fck/file/jopavexa.pdfIn PDF document text
    • https://cabsfromheathrow.com/userfiles/file/29198378204.pdfIn PDF document text
    • https://questyme.ca/userfiles/file/rodazito.pdfIn PDF document text
    • http://bscartridge.com/pic/78107300068.pdfIn PDF document text
    • https://hgindustrial.eu/userfiles/files/bedesefudofo.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/pikak.pdfIn PDF document text
    • https://sumangold.net.vn/wp-content/plugins/super-forms/uploads/php/files/6m5vuo9pn9qvv877pr44jfvoi6/xotipimokogeta.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/vegurosigofuzuliwumatazip.pdfIn PDF document text
    • http://mcutech.net/files/mamejugiwimo.pdfIn PDF document text
    • http://wienbildarchiv.com/upload_files/files/50257443110.pdfIn PDF document text
    • https://cartolmania.it/file/18390948066.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=kof+allstar+downloadPDF 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_off0000b509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB509 10200 bytes
SHA-256: f1fe760c42aeb04b25fa74515711bbb619a2fe0aef1602f35e16a3885e7c80e0
font_01_sfnt_off0000cc19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC19 16212 bytes
SHA-256: aab785aa2992a1d7fff0e527775574e8fd9d5ff5393d76e99217f6d50f3f0ba0
font_02_sfnt_off0000f55f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1