Malicious PDF — malware analysis report

Static analysis result for SHA-256 50ce70ab1ab5d7d9…

MALICIOUS

PDF

79.8 KB Created: 2021-09-16 01:24:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 884134ea9ac199ee50e9e2386b8bde49 SHA-1: 30fde4a47461200bf0f155900663617c0ee46bd8 SHA-256: 50ce70ab1ab5d7d95124935ce3c86140ab849dfaa9e75c953f00159edde2c402
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious. The critical heuristic 'SE_SECRET_RECOVERY_LURE' indicates the document's intent is to trick users into revealing sensitive recovery information. While no scripts were explicitly extracted, the presence of numerous embedded URLs, many pointing to potentially compromised or disposable hosting, suggests a phishing or credential harvesting campaign. The document's structure and embedded links align with common phishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://lrsdev.com/userfiles/file/jegezuxikawifupebigameruj.pdf In PDF document text
    • https://deshpanday.com/ckfinder/userfiles/files/45666219049.pdfIn PDF document text
    • https://pesonabali.dswip.com/ci/userfiles/files/27794375903.pdfIn PDF document text
    • http://citranco.com/users/files/tanuv.pdfIn PDF document text
    • http://www.neoneofitou.com/ckfinder/userfiles/files/bulevubajafojo.pdfIn PDF document text
    • https://ises.ca/phpsites/vertical_living/uploads/file/23431321528.pdfIn PDF document text
    • https://www.budgetskemaet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/1613caad50bb76---daranonuwavozajodij.pdfIn PDF document text
    • http://afro-safari.com/upload/files/37506335922.pdfIn PDF document text
    • http://npi-management.com/ressource/site-image/files/nudibufowibow.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/banovipobejod.pdfIn PDF document text
    • https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/16140f398c5bb0---jukixina.pdfIn PDF document text
    • http://one9five.com/userfiles/files/1847984979.pdfIn PDF document text
    • http://customize.fr/fckeditor/editor/filemanager/connectors/php/img/Editor/file/koxep.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210903_141316.pdfIn PDF document text
    • http://rhondachem.com/d/files/38087440696.pdfIn PDF document text
    • http://fasson.vip/images/editor/files/kariwevuguxululo.pdfIn PDF document text
    • https://nsck-cykelmotion.dk/ckfinder/userfiles/files/12303308167.pdfIn PDF document text
    • https://classoft.ro/userfiles/file/44072681852.pdfIn PDF document text
    • https://glasschneider.koeln/wp-content/plugins/super-forms/uploads/php/files/7pas6o5l4bighgvvjvsuhr8nl0/mafotitufi.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/94738574546.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/bodudirufaxumunoxo.pdfIn PDF document text
    • http://alltechsro.cz/files/98281011156.pdfIn PDF document text
    • http://flirtproducties.nl/ckfinder/userfiles/files/romalavuriw.pdfIn PDF document text
    • http://intertribo.sk/files/35926076095.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/65021981518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=how+to+remove+password+in+tabletPDF 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_off0000d373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD373 10836 bytes
SHA-256: 281214194b896586f1b0b56d663902f061bbb29c7b6485827930c1b63d47df35
font_01_sfnt_off0000ec39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC39 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001044b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1044B 17452 bytes
SHA-256: 7822050fb8f1117c26622c9652e77156a48dc7ff83f9fa4dca17bfe86afe5da6

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