Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee11d1719bb819e7…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 17:34:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: bdd02ac4e24a9d03f2e3dd4d6b087d65 SHA-1: 91d7670de0b7dd77e1da190a31641348ee9a3b4a SHA-256: ee11d1719bb819e7fe0d99b514a94b7ff9d6c1d8aeade2aa9b643ae08c27d39f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many pointing to compromised websites or disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to lure users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://irlanc.ru/uplcv?utm_term=harry+potter+philosopher%27s+stone+online+watch PDF link annotation
    • http://zulassung4you.de/bilder/file/92209930470.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c9d82e36a5---viviwuzopozuwav.pdfIn PDF document text
    • http://sochi-riba.ru/ckfinder/userfiles/files/zufolesijizaxopi.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/cvjukmgsg0es3003d10d19c1b3/rolid.pdfIn PDF document text
    • https://samuelben-horin.com/userfiles/file/peligemijesepe.pdfIn PDF document text
    • https://ms2oke.com/contents/files/zorikutavewatewurad.pdfIn PDF document text
    • http://pogologistics.com/ckfinder/userfiles/files/bafoleledafofubaludoga.pdfIn PDF document text
    • https://www.hinkler.com.au/application/third_party/ckfinder/userfiles/files/49809511654.pdfIn PDF document text
    • https://penzion-palice.cz/content/33920703771.pdfIn PDF document text
    • https://betalinktech.com/blmedia/file/ninawebojetodugavovujevim.pdfIn PDF document text
    • http://pk.mo/userfiles/file/75379217112.pdfIn PDF document text
    • https://thehouseconcert.com/ckfinder/userfiles/files/84501621155.pdfIn PDF document text
    • http://basse-normandie.annuaire-regional.com/ckfinder/userfiles/files/feduvabalefowifudeb.pdfIn PDF document text
    • https://penal-garazh.ru/files/vanim.pdfIn PDF document text
    • http://mulroyenvironmental.ie/userfiles/file/vetaxupive.pdfIn PDF document text
    • http://westpakusa.com/phpsites/vertical_living/uploads/file/vugegurafan.pdfIn PDF document text
    • https://sirikulsteel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138979a27bf7---ludateviseleworoj.pdfIn PDF document text
    • http://koreaticketland.com/userfile/file/15846514834.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/posus.pdfIn PDF document text
    • http://vtracauto.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dbc1836edb---giduwikevi.pdfIn PDF document text
    • http://ippinnudon.com/uploads/files/13878335567.pdfIn PDF document text
    • http://hmsendo.pl/uploads/editor/file/19992441580.pdfIn PDF document text
    • http://upakuika.com/img/file/20814401876.pdfIn PDF document text
    • http://softwaretesting.kr/club/data/userfiles/file/20210915220455.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/44077738379.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_off0000e1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1A5 18388 bytes
SHA-256: 49bc8c9d9bed58263cf70d6f7857d693267ee635eb8665c1551e1cd45ced06e6
font_01_sfnt_off00011173.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11173 10696 bytes
SHA-256: 70abaee1b048c11b1928b8b319aae06f9c1b9c21e2d1e819c9be6d69a8466b34
font_02_sfnt_off00012a0a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A0A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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