Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8d478a62f6e2313…

MALICIOUS

PDF

84.4 KB Created: 2021-09-02 02:06:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a37e45267bc30f44e14dd3b030a009e1 SHA-1: 2decd1058531f2253e4732b531c24de245cdddee SHA-256: f8d478a62f6e2313b4cdbf661a2aed90aa246f33ad8955e351b9e5c8ed361eb5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. Several heuristics indicate that the PDF acts as a link farm, pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://ideylia.fr/uploads/file/53536488147.pdf In PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/160ce90fac758b---96904468957.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/d54a06636756c9b4b7e8328af6fc663b/desavofalad.pdfIn PDF document text
    • http://www.trimbleexpress.sk/wp-content/plugins/formcraft/file-upload/server/content/files/16084e07a940b5---54459017289.pdfIn PDF document text
    • http://hataylezzeti.com/resimler/files/61091080543.pdfIn PDF document text
    • https://sts-cct.com/app/webroot/userfiles/files/49460419350.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d919074c66---gejoti.pdfIn PDF document text
    • http://abwcockeysville.com/uploads/files/jukutelobupekatatana.pdfIn PDF document text
    • http://garderoba.sk/images/_file/39413215466.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/8b2a2bdc31c6952f27932a3436cbd131/48123395836.pdfIn PDF document text
    • https://planet-for-events.de/userfiles/file/futawoza.pdfIn PDF document text
    • http://gpkoaee.ru/ckfinder/userfiles/files/77233184504.pdfIn PDF document text
    • http://brkvinc.com/userfiles/file/81895424052.pdfIn PDF document text
    • http://xn--80aguejfegacgj0ad.xn--p1ai/pict/file/kuluxunidozemov.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/molotinizagagenarenexuj.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/daguxozokakipeludega.pdfIn PDF document text
    • http://www.infranetltd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089a31837702---pawowuvifovataguvabu.pdfIn PDF document text
    • https://pcetravel.com/files/file/34199924108.pdfIn PDF document text
    • http://www.msjcongregation.org/www/js/ckfinder/userfiles/files/guvelugewiz.pdfIn PDF document text
    • http://vivaldiskibus.com/FileData/ckfinder/files/20210705_6A134233D72D39F4.pdfIn PDF document text
    • http://www.hollyskauaicondo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076e580a61ea---77716449296.pdfIn PDF document text
    • https://ahi.com.ua/wp-content/plugins/super-forms/uploads/php/files/8756e807ac44c022e4345f799efae222/26066775740.pdfIn PDF document text
    • https://evg-prague.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16085c3a75c659---95520588496.pdfIn PDF document text
    • https://www.kunapak.com/wp-content/plugins/super-forms/uploads/php/files/6j2dinh3ahlm2t9p8la94edscn/95956240738.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=would+you+rather+inappropriate+questionsPDF 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_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 18240 bytes
SHA-256: 3be5c4aedf68fcf45c49ad488cd917aae9ff7e9f01e19bcfd10121c01b11cf58
font_01_sfnt_off0001128b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1128B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012aa2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AA2 10844 bytes
SHA-256: e9089b72359e97b8f16a58c492e1e1f23c066e0c42581e4f35b85cade5fce723