Malicious PDF — malware analysis report

Static analysis result for SHA-256 edde8413e4140e36…

MALICIOUS

PDF

76.9 KB Created: 2021-09-20 13:03:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 129fe36a20f1dc8e354c6c8ca52263fd SHA-1: 4f573919a26c227fa61875f35006fd5e07d4eae3 SHA-256: edde8413e4140e36d29d5a178d84072f34a1dfff5272617619eb2384a9329bc0
196 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious. It contains numerous embedded URLs, many of which point to compromised WordPress upload storage or disposable hosting, indicating a link farm designed to redirect users to potentially harmful content. The heuristic 'SE_LOLBIN_RUN_COMMAND' suggests the document text may contain commands or executable paths, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • 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://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/37171291621.pdf In PDF document text
    • http://leebyunghun.org/new/upload/board/files/65787499296.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613e983ac7233---43632298519.pdfIn PDF document text
    • http://charmingcurls.se/upload/file/xuxavuk.pdfIn PDF document text
    • https://gres-k.cat/userfiles/file/11252005227.pdfIn PDF document text
    • https://asoriofrio.org/ckfinder/userfiles/files/motemopatukuwuf.pdfIn macro / runtime command snippet
    • https://savitravel.ro/ckfinder/userfiles/files/18875792400.pdfIn macro / runtime command snippet
    • http://webinaris.org/ckfinder/userfiles/publics/files/14104015680.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/luvufewab.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/rigezitativorifomepid.pdfIn PDF document text
    • http://lawcab.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613c5f8a2d0cf---nevuw.pdfIn PDF document text
    • http://doctour.hu/uploads/ckfinder/userfiles/files/57983547139.pdfIn PDF document text
    • http://nandishoverseas.com/UserFiles/File/63646452783.pdfIn PDF document text
    • http://vaynhe.com/upload/files/44677548937.pdfIn PDF document text
    • https://catherinehourihan.art/wp-content/plugins/super-forms/uploads/php/files/5cdad112b300cb7054094b83e411b08c/befalarovujase.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/kezimajijot.pdfIn PDF document text
    • http://cobe-ing.it/userfiles/files/sitalinesamipiwukav.pdfIn PDF document text
    • http://jj-metals.com/userfiles/file/2021090907514573499.pdfIn PDF document text
    • https://rowanmkt.com/Uploads/ckfinder/userfiles/files/pinabexuwidilodivubos.pdfIn PDF document text
    • http://hamyarsanatco.com/ckfinder/userfiles/files/mopuwuxusijezo.pdfIn PDF document text
    • https://jotelek.hu/files/file/23943088667.pdfIn PDF document text
    • https://aathichudi.org/userfiles/file/penitowuwexukafaredoma.pdfIn PDF document text
    • https://alohasafaris.com/files/7425034810.pdfIn PDF document text
    • http://hurtowniagrafit.pl/userfiles/file/84439317436.pdfIn PDF document text
    • https://gres-k.cat/userfileIn macro / runtime command snippet
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=when+is+season+5+of+my+hero+academia+coming+outPDF 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_off0000c582.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC582 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD94 17872 bytes
SHA-256: dcf4d860efce05655fe43cee0132a7e3d14faee575f190c617e0465ae0e8fbf8
font_02_sfnt_off00010bca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BCA 11220 bytes
SHA-256: 93140172c1eabca3062b5faa8023ae67b9c46ee8ed725fb619a22081fa4e3556

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