Malicious PDF — malware analysis report

Static analysis result for SHA-256 908350642aa5730b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-07 22:13:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 827dbe293451e27347859aa0ad040f32 SHA-1: 1420c42ac25a2c4360902dc19de410b3f00b7478 SHA-256: 908350642aa5730b02914177d574ffc7ed27579507156f9c6e3a8f8b2a13a79f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via these links. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9849

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://clickkedai.com/userfiles/file/nasevalugawafewanola.pdf In PDF document text
    • https://bbpartner.cz/userfiles/file/42822142699.pdfIn PDF document text
    • http://b-solutions.net/userfiles/file/panonepujomaxo.pdfIn PDF document text
    • https://40parables.com/wp-content/plugins/super-forms/uploads/php/files/87aad64a4840c9a6823db56b04c3e840/7964005952.pdfIn PDF document text
    • http://ippon.lv/uploads/File/kaborixizo.pdfIn PDF document text
    • http://www.museopizarra.com/ckfinder/userfiles/files/nesovevinuru.pdfIn PDF document text
    • https://ta-taiwan.com/app/webroot/userfiles/files/badininagejokobisufowuxer.pdfIn PDF document text
    • https://laxmigrouppune.com/wp-content/plugins/super-forms/uploads/php/files/fa8866ccab24920bc49353ab54df8380/womadikulosiwikamope.pdfIn PDF document text
    • http://www.skupp.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160a24470274b8---lumigiloxefore.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/koguzinodat.pdfIn PDF document text
    • https://www.isnb.co.uk/wp-content/plugins/super-forms/uploads/php/files/07a539bb056904f064a8f6b0a66c76a8/legug.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/28691482021.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/82vue49p3gqnmr0cmfrqbkbio6/voludajujaveduwifumogitum.pdfIn PDF document text
    • http://streetnn.ru/data/upload/ck/files/76574592748.pdfIn PDF document text
    • http://feriaalainversa.com/uploaded/files/87434344237.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/28706762147.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/41927506476.pdfIn PDF document text
    • https://etre-cheval.fr/Applications/MAMP/htdocs/etre%20cheval/news_pix/file/55645239451.pdfIn PDF document text
    • https://renebeumer.nl/userfiles/file/97461007582.pdfIn PDF document text
    • http://obrienbuilders.com/userfiles/file/zubuziso.pdfIn PDF document text
    • http://dolphinegypt.net/userfiles/file/womil.pdfIn PDF document text
    • http://thaihotelsale.com/FileData/ckfinder/files/20210615_B740E7E8BC158C0C.pdfIn PDF document text
    • http://soupworld.de/upload/file/simewenamiviw.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/75eeb3cb6857cd8605da73b7f6df52c4/95052793070.pdfIn PDF document text
    • http://dakmet.pl/upload/xujidegilexabus.pdfIn PDF document text
    • http://designbeginnings.com/upload/file/wigow.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=challenging+cases+in+pediatric+emergency+medicine+pdfPDF link annotation
    • http://irodori.kir.jp/files/file/95584807434.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_off0000e566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE566 18664 bytes
SHA-256: 400bf4a4d1b3981eb93d291cd0ebfe2d6f061301974e5c6b992bfe28209a70c2
font_01_sfnt_off00011694.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11694 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012eab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EAB 11092 bytes
SHA-256: 26972a4641cc7a7f51d5a3cbfb1f3be5793fd6b8916b836dea8a63e13dc6ab1d