Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b0c4eda907af70f…

MALICIOUS

PDF

92.2 KB Created: 2021-09-08 19:59:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a15d5bed03c30dd8e30da369109622dc SHA-1: bd15acc203bb37b03491357b61d21b8e812a8029 SHA-256: 8b0c4eda907af70f6a8e0a7ccfa043f174a30d522656ab709045b4761b8cb1cc
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the nature of the links and the heuristic firings point towards an attack pattern involving directing users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 http://parateam.cz/file/zobonef.pdf In PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136f4608dafd---xofowo.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e678a0f9e---badoxivewajolosifapaxe.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/37280302334.pdfIn PDF document text
    • http://sumosushingrill.com/uploads/files/guralujuxubujovelolapabug.pdfIn PDF document text
    • https://webgirls-studio.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135122196957---39295844215.pdfIn PDF document text
    • http://chieucoingason.vn/files/zekapozog.pdfIn PDF document text
    • http://spharma.ua/files/file/wigavokodakoz.pdfIn PDF document text
    • http://lasfyy.com/uploadfile/file/20210904071500060.pdfIn PDF document text
    • http://stelmart.ru/userfiles/file/17009997390.pdfIn PDF document text
    • http://zeci.nl/im/image/55016331699.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/milozetumorujoza.pdfIn PDF document text
    • http://sosonomo.com/ckfinder/userfiles/files/96231344558.pdfIn PDF document text
    • http://locthanhroyal.com/upload/files/liribexegawoxexivuz.pdfIn PDF document text
    • http://hylimusic.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/wuzovatud.pdfIn PDF document text
    • https://ambulatorioveterinariosismondi.eu/file/wixiwobikoxefen.pdfIn PDF document text
    • http://markaz-e-durood.com/EditorImages/file/gulelopupopebizolekanum.pdfIn PDF document text
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/fdd82db7a6902fddc6c992b680159924/gugedesan.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/38736975669.pdfIn PDF document text
    • https://cruiseship.cruises/wp-content/plugins/super-forms/uploads/php/files/eq2nbcme2718319lelclsbnobg/kumifawavanawexo.pdfIn PDF document text
    • https://haciendaloscipreses.cl/upload/file/53595071439.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/15704244089.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/gukuv.pdfIn PDF document text
    • http://aven.su/userfiles/file/nowalug.pdfIn PDF document text
    • https://sindicav.com.br/ckeditor/ckfinder/userfiles/files/ninojaboralusemukidazakeg.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=curetagem+semiotica+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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000114b7.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x114B7 18228 bytes
SHA-256: 2a9b9a67085ef9aa51395134facb4719bd8deca3fe336540f4ad83f23a194a7b
font_00_sfnt_off0000e6a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6A5 17944 bytes
SHA-256: 6d6171ff2df0e34a533b4862f8e84b8dd1eb634149754048d617df4c1b4077f6
font_02_sfnt_off0001317b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1317B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14992 10944 bytes
SHA-256: 2abcddb4c26a662d1a467ee12c5c310292b0b2a724034aaecc48439db53c1a18

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