Malicious PDF — malware analysis report

Static analysis result for SHA-256 07ec4185fde1cb55…

MALICIOUS

PDF

80.3 KB Created: 2021-09-04 11:59:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: ed7645abd59dd684184636622988ff2e SHA-1: acc3fac019e08c0d221f377e6fa5cbf1005fafc7 SHA-256: 07ec4185fde1cb55bcb6364059a41775791aa3388161899acd64ea8dc431f25c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous links to external websites, many hosted on compromised CMS platforms, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to manipulate search engine results for malicious purposes. No scripts were extracted, but the overall structure and URL patterns point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 6

  • 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.
  • 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://www.tzounakos-insurance.gr/ckfinder/userfiles/files/jowusimobilitenadox.pdf In PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/96c8328eca233f2fe40ed200f1801835/vumepisisigisakafawusal.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608284e137bbd---74477925309.pdfIn PDF document text
    • https://eagleegg5k.com/ckfinder/triplebuserfiles/file/92231154498.pdfIn PDF document text
    • http://branpc.in/ckfinder/userfiles/files/dikaxotokogemawesud.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/g8jbt8ic7kf640i8ais7erde0b/tijitinuwikiv.pdfIn PDF document text
    • http://classicalgardenornaments.com/uplds/file/lufogiva.pdfIn PDF document text
    • https://askopenko.com/wp-content/plugins/super-forms/uploads/php/files/b0cf32e56b29b60758dee9940a19c862/lexujeriporolasug.pdfIn PDF document text
    • http://jevades.com/aircraft/fckimages/file/sukewoxenexifuluru.pdfIn PDF document text
    • http://odumakus.com/uploads/files/deletori.pdfIn PDF document text
    • https://hmjrgoldhockey.org/wp-content/plugins/super-forms/uploads/php/files/d6ad6ca7c339989d42192d524a1897e8/79533538038.pdfIn PDF document text
    • https://beautyyaurient.com/editor_upload/file/52207809758.pdfIn PDF document text
    • http://www.polni.si/Images/files/sevuzirisudufatupopeziped.pdfIn PDF document text
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/1iomoh7tkpbd1nh117r9njjo2s/94029385745.pdfIn PDF document text
    • http://kondicionery-lubertsy.ru/upload_picture/file/19395834641.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610c44cbc8dce---15236748174.pdfIn PDF document text
    • http://gpszone.hu/upload/userfiles/file/zizuboni.pdfIn PDF document text
    • http://ck-buhgalter.ru/userfiles/file/75615103472.pdfIn PDF document text
    • http://atthaya.com/file_media/file_image/file/87270958462.pdfIn PDF document text
    • http://safedoorsystems.com/cmsimages/file/pivegomidunivitikike.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/nlusltb73hoj4oqlss0v8k8vf3/49387706512.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/jifaxetowaf.pdfIn PDF document text
    • http://wonsakai.com/uploads/files/32550707742.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=xps+to+pdf+converter+freewarePDF 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_off0000d54e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD54E 17668 bytes
SHA-256: 5bd60c34791c5809dd78ef065209d5fd26fa69b3b7a54b291530e391bdb753a3
font_01_sfnt_off000102f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102F1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B08 10636 bytes
SHA-256: bede004f86dd855f8a9b542c89d2c6d8242b28aaa9e9453320393ea115c8f3eb

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