Malicious PDF — malware analysis report

Static analysis result for SHA-256 d566931c55805327…

MALICIOUS

PDF

95.8 KB Created: 2021-08-08 02:54:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-16
MD5: d2b8a90d31481d1b47a305179d9593d5 SHA-1: 695cb4ff7f1f54fed75d90eed5305c940664a2fd SHA-256: d566931c55805327ac723a535b32650eda3de5ae250a09c7340665b56a8098d2
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a significant number of URLs, many pointing to compromised CMS uploads and disposable hosting, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL patterns are indicative of a phishing lure or a downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

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 http://pazarziraat.com/userfiles/file/18608381266.pdf In PDF document text
    • http://ghalemdi.com/userfiles/file/vetelere.pdfIn PDF document text
    • https://rebel-guitars.com/wp-content/plugins/super-forms/uploads/php/files/e058cc254f37de1d714fe6795d3b312f/69925248984.pdfIn PDF document text
    • https://cbolean.com/wp-content/plugins/super-forms/uploads/php/files/fj3iu4dbvsbgtg6aini4fjhkb6/rijojenikazobivewero.pdfIn PDF document text
    • http://mobiliteit.nu/files/14083142590.pdfIn PDF document text
    • http://lacasedescaraibes.fr/file/tejegu.pdfIn PDF document text
    • https://cms.blauraum.com/wp-content/plugins/super-forms/uploads/php/files/bab78dd506ab94e08159459857d89fe0/xawal.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/00e540534fa331c71e81d570429f82c9/kowililivizuwumifajo.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a599b534662---xobidalikofi.pdfIn PDF document text
    • https://www.rogierstoel.nl/wp-content/plugins/super-forms/uploads/php/files/bv0i72o4g9665oic4iogq6jcc6/vozoze.pdfIn PDF document text
    • https://wisserarm.nl/app/webroot/files/userfiles/files/bowigegor.pdfIn PDF document text
    • http://www.recko.ru/ckfinder/userfiles/files/diluxedetekexuferarinop.pdfIn PDF document text
    • http://cartonwrappingmachine.com/userfiles/file/pakeferuf.pdfIn PDF document text
    • http://anchor-m.com/js/upload/files/71135127296.pdfIn PDF document text
    • https://bibliotheque-des-arts.com/ckfinder/userfiles/files/gixewisawurexolotuvol.pdfIn PDF document text
    • http://sakirnoopo.ru/wp-content/plugins/super-forms/uploads/php/files/1191edd7e8a3c3db511e69d258a6985d/15436609030.pdfIn PDF document text
    • http://abovomedia.hu/_user/file/44594894516.pdfIn PDF document text
    • https://humantouchtranslations.com/wp-content/plugins/formcraft/file-upload/server/content/files/1/160909252778c4---rifiwatop.pdfIn PDF document text
    • http://epoxidice.ro/mm/file/68137375696.pdfIn PDF document text
    • http://apcmagon.com/userfiles/tatosamovadirafefinijede.pdfIn PDF document text
    • http://studioarchterreni.it/userfiles/files/jujamofuseja.pdfIn PDF document text
    • http://tantusmarina.com/UserFiles/file/49836263483.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=kamen+rider+decade+flash+belt+androidPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA82 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011294.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11294 18208 bytes
SHA-256: 8630e1db733e1886edee9b536c59e475d01c1d584e5845c0711046815447b182
font_02_sfnt_off0001422b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1422B 6096 bytes
SHA-256: 6f4cf6f22392033f268cee5128c1ca5b9a7d0fb4974345233a70142474a7c405
font_03_sfnt_off0001577b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1577B 10872 bytes
SHA-256: 0b1c16dbfe05e685ad9d1aa992166e05444cd2888b79f220dc64bfada2174627