Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0848daabe97dd8b…

MALICIOUS

PDF

84.0 KB Created: 2021-09-08 06:29:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 6fae1dcae4b283c16866c2c3faf23ce9 SHA-1: 5dd32bd473a5ebcc3f26d23a39e4e4e85ed71bc9 SHA-256: d0848daabe97dd8bba0fa969e8ee0ed890fb347e0c585ac7aaf1e4a9d2be80a9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics as a link farm, with many distinct hosts and URLs pointing to potentially compromised content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The document body is unreadable binary data, providing no direct content clues, but the embedded URLs and heuristic findings are sufficient to assess the attack pattern.

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://smidgel.ru/uplcv?utm_term=coqueluche+pdf+ministerio+da+saude PDF link annotation
    • http://msamerica.net/clients/873634/File/jerugomusapajumati.pdfIn PDF document text
    • https://refour.eu/wp-content/plugins/super-forms/uploads/php/files/7bd5b16af3b6764ad6c8ed3e035cf1ef/26608815844.pdfIn PDF document text
    • https://telorgabus.com/contents//files/11826071891.pdfIn PDF document text
    • https://sip7.pl/autoinstalator/sip7.online/wp-content/plugins/super-forms/uploads/php/files/5396bb4c5622738cf86bca7d2ec2f3d0/26411610580.pdfIn PDF document text
    • https://agribusiness.pk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d429177168---64400675523.pdfIn PDF document text
    • https://olivierdaulte.com/ckfinder/userfiles/files/wazaziwafaz.pdfIn PDF document text
    • https://www.kbstephens.com/wp-content/plugins/super-forms/uploads/php/files/3fc4fab7a463ef592841a33556ad3bb5/40156490383.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/zabivubiwunewa.pdfIn PDF document text
    • http://jongauger.com/ckfinder/userfiles/files/bexofidudiluroxo.pdfIn PDF document text
    • http://reanda.com/jingkelun/userfiles/files/20210705123001.pdfIn PDF document text
    • http://www.naturapreserved.com/wp-content/plugins/formcraft/file-upload/server/content/files/160830e7e0f70e---fokazuxorezezir.pdfIn PDF document text
    • https://synersys.fr/contenu/file/sefusibax.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16074a72e6a441---69578797654.pdfIn PDF document text
    • http://eaeocs.com/clients/c/c7/c75ed17bfa54634cfc1039f1b599a7e7/File/sonosakat.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/22085012015.pdfIn PDF document text
    • http://xn--80aaae7amexjfdlfdfg.xn--p1ai/files/file/85983413932.pdfIn PDF document text
    • http://coeb.eu/userfiles/files/15974937337.pdfIn PDF document text
    • http://bilmatbasim.com/userfiles/file/kifexerejekusawomofo.pdfIn PDF document text
    • http://rebornfair.com/FileData/ckfinder/files/20210804_86AFE38329E64661.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb9572dc08---kowidimutunal.pdfIn PDF document text
    • https://jordan.si/dokumenti/file/17779985885.pdfIn PDF document text
    • http://hifimarkt.eu/kunden/kronhardt/ckfinder/userfiles/files/vaputavajaxuvo.pdfIn PDF document text
    • http://rotang.net/userfiles/file/86558460647.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_off0000df48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF48 11164 bytes
SHA-256: 7b2b2f7c7983fdde2fec23881d51c4f06bd6e4211e426497af8de55ef7ab23e2
font_01_sfnt_off0000f8f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8F8 18916 bytes
SHA-256: 426a09cdcb51060c1b12f68b21193455a13d74790b4bbdd2549f535873ae41a8
font_02_sfnt_off00012a1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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