Malicious PDF — malware analysis report

Static analysis result for SHA-256 423d656d7c932e53…

MALICIOUS

PDF

83.6 KB Created: 2021-08-18 15:23:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 012b7cd5b3961fc0d03fe6f30c742391 SHA-1: b234545742f1ab8fae68f5d5415b374b41dab15f SHA-256: 423d656d7c932e530e1929a84f42bf7d680a735e7c50aa428042a3ac4d7509e6
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous embedded URLs pointing to compromised websites and potentially malicious PDF files, suggesting an attempt to lure users to malicious content. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9925

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://verner.lt/images/files/12576420376.pdf In PDF document text
    • http://havefuntogether.com/image/upload/File/ximepemubizixo.pdfIn PDF document text
    • https://svrcontractors.com/wp-content/plugins/super-forms/uploads/php/files/4990debfcbd51e3967dfdbdc80a4cfb5/87828538034.pdfIn PDF document text
    • http://www.iycadana.org/wp-content/plugins/super-forms/uploads/php/files/c5on7pfq4ufoth4nkqdmf6e0m5/luwikawubuzadigokat.pdfIn PDF document text
    • https://arab-hams.com/Ups/files/7667053489.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/25711504842.pdfIn PDF document text
    • http://cetinelektrik.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1611c47a56edd6---libiginisewizetuxomi.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/80269697663.pdfIn PDF document text
    • https://wendi101.com/userfiles/file/94533694645.pdfIn PDF document text
    • https://www.c2commercial.com/wp-content/plugins/super-forms/uploads/php/files/3eea7e7fad2af528c99a40f4ecb42aa5/tosadatugimumofone.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d086ed58b6---74551813049.pdfIn PDF document text
    • https://mvmdigital.gr/files/files/xanakikunugiro.pdfIn PDF document text
    • http://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16099b7ca09647---rokiwitib.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/35003501867.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/go3vvj5v76jghuq5qlo9tnjok8/waxotelezugaripuxu.pdfIn PDF document text
    • http://dangkyidol.com/wp-content/plugins/super-forms/uploads/php/files/ft2folrtop5t145kciq5kf2q15/44175094726.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cd51dd50b8---jepezagigasekagaso.pdfIn PDF document text
    • http://anneadamslaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/46199629081.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/58380367030.pdfIn PDF document text
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079eef12586f---16934920826.pdfIn PDF document text
    • https://pearproperties.in/userfiles/file/mosozini.pdfIn PDF document text
    • https://daquin-ferriere.fr/userfiles/file/jalov.pdfIn PDF document text
    • http://menloathertonhigh1980.com/clients/6/6f/6f83464fe0b13873896cace574d4baa5/File/sovatodogobemene.pdfIn PDF document text
    • http://globalbando.com/DATA/upload/files/202107280017259624.pdfIn PDF document text
    • http://www.tsssport.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608400249429c---57383894992.pdfIn PDF document text
    • https://petala.gr/userfiles/file/47643202881.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=solucionario+biolog%C3%ADa+y+geolog%C3%ADa+3+eso+sm+savia+pdfPDF 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_off0000da75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA75 11592 bytes
SHA-256: 370cae893ee1aaf6973ae0295bd87caed9b0aafc0d43cb0ba0ad2c7fd8333e42
font_01_sfnt_off0000f588.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF588 18408 bytes
SHA-256: 1473c89dec5cc1ebebb49ec7eff98c55b83baf90133f5f41ebd3fabfb21894f1
font_02_sfnt_off0001247e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1247E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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