Malicious PDF — malware analysis report

Static analysis result for SHA-256 9983d93245dd1418…

MALICIOUS

PDF

81.7 KB Created: 2021-09-24 00:26:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9eefffacf4957a2c73e60ee099b8d395 SHA-1: 0b49624adbdbcbbde3c1d12fd44628b733da52f3 SHA-256: 9983d93245dd14183b4759209f1e881e86599701b1f6572311bd31705a1d15a6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable hosting, indicative of a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=difference+between+redmi+note+10+pro+max+and+redmi+note+10+pro PDF link annotation
    • https://chrmglobal.com/userfiles/file/rofuvisiravefavalarim.pdfIn PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b82ae46ac3---xigejejazo.pdfIn PDF document text
    • https://fiscalonline.eu/app/webroot/files/userfiles/files/xejaxudosazofamenuvefokuz.pdfIn PDF document text
    • https://a-pointpro.com/cms/ckfinder/userfiles/files/91659212300.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/zixefafokeg.pdfIn PDF document text
    • https://robodom.si/files_vsebine/93794113628.pdfIn PDF document text
    • http://giovanninociti.com/userfiles/files/74897483142.pdfIn PDF document text
    • https://kientrucqhouse.com/uploads/image/files/39721411024.pdfIn PDF document text
    • https://www.agcontraincendios.es/ckfinder/userfiles/files/29452526234.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdbe6a358a---pelisu.pdfIn PDF document text
    • http://winso.tw/userfiles/file/tugenelup.pdfIn PDF document text
    • https://tfnd.org/wp-content/plugins/super-forms/uploads/php/files/91cee6e8e18adc78578354425482b544/8533420353.pdfIn PDF document text
    • http://kondicionery-lobnya.ru/upload_picture/file/96988519353.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/48765522083.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/36576877453.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/62491659016.pdfIn PDF document text
    • https://wigs4less.net/nbloom/fckuploads/file/99963660695.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/tebewojofovisutuwidire.pdfIn PDF document text
    • http://ilsogno-bomboniere.com/userfiles/files/15531058311.pdfIn PDF document text
    • https://chineseclothingonline.com/File/84479920707.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/xoxapin.pdfIn PDF document text
    • https://hacunamatata.ru/wp-content/plugins/super-forms/uploads/php/files/a8abcaa969a067d440956b675f033a77/tewujul.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_off0000d8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EC 17664 bytes
SHA-256: a1d0c773d52113a5f374d2f8ab356a7f001543932381b54c50a9557e512cf8d1
font_01_sfnt_off000106f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106F0 11072 bytes
SHA-256: 76edd39517c2de0d89d524e81e9c61c2de8696932b02fc7e6a269e3ab66a8bd8
font_02_sfnt_off0001209c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1209C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1