Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b75942158e69bce…

MALICIOUS

PDF

86.0 KB Created: 2021-07-21 19:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d6777260baec19bb9dd57e17522b5ea0 SHA-1: a7cce08e762166577fcde75c9d98e27c637a9198 SHA-256: 9b75942158e69bceb74cdb775f76ce72be534c6e898b833d31f5e0adb64f540f
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics indicate it functions as a link farm, directing users to various compromised CMS upload locations and disposable hosting sites, likely to download further malicious content. The presence of embedded URLs and the invoice lure suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

Heuristics 8

  • 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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://overtonnation.com/clients/f/f9/f97855507a39dfa58978186db9bff07a/File/64084506682.pdf In PDF document text
    • http://csc0351.com/userfiles/file/20210622182727_j1cx75.pdfIn PDF document text
    • http://xycrusher.com/d/files/35587946529.pdfIn PDF document text
    • https://edukiya.com/wp-content/plugins/super-forms/uploads/php/files/e8b612d0bbd7b4c0e3f7ec9abe6ddfca/fedot.pdfIn PDF document text
    • https://inclinedigital.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608427684bdde---lesoxawigizogulegifizubu.pdfIn PDF document text
    • http://greenhousehotel.vn/uploads/image/files/sexelulejuwujobofakike.pdfIn PDF document text
    • https://creativitagh.com/pevron/www/img/file/23260070612.pdfIn PDF document text
    • http://bethelcommunityone.com/clients/880032/File/32938043493.pdfIn PDF document text
    • https://halobysciton.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e0ea15b7e4---xesorepukajaz.pdfIn PDF document text
    • http://www.restorationservice.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5b6dac0cd---69463393981.pdfIn PDF document text
    • https://associazionedynamica.it/uploads/file/34110064376.pdfIn PDF document text
    • https://absolut-fit-and-dance.de/wp-content/plugins/super-forms/uploads/php/files/6k65q2obpnmlesjb667pebb846/97399557199.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/36d3aa72a89779e2b5ae531d4edc96a0/rerujub.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/bec5d4697cc910226be963d0d3836639/29679698245.pdfIn PDF document text
    • https://stopserv.ru/files/file/latifital.pdfIn PDF document text
    • https://dacola.com/upload/files/lusar.pdfIn PDF document text
    • http://candientu24h.vn/webroot/img/files/62873188072.pdfIn PDF document text
    • http://localhomesales.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16088e9d349386---99596964925.pdfIn PDF document text
    • http://forter.vn/hinhanh/file/dikoluzisezorovitavelibu.pdfIn PDF document text
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/070bf0bf5825bee7f96566971a102e50/49439787550.pdfIn PDF document text
    • http://kowel.com/ckfinder/userfiles/files/1622671763.pdfIn PDF document text
    • https://limmaginebistrot.com/file/fokijuvisa.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/6dkojehs0eb1bit1r6ejcnqv63/piwonuxedatuza.pdfIn PDF document text
    • http://sethhukumchandschool.com/userfiles/file/jikubolivolawufek.pdfIn PDF document text
    • http://stonebreaker.at/17166524654.pdfIn PDF document text
    • http://architettodrabeni.it/userfiles/files/mikuzibavedub.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=vouching+of+sales+bookPDF 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_off0000ed7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED7D 16860 bytes
SHA-256: e5bbdb8417843ea466009adcfadca44a248095c1b451203baeb4bd98c53cad18
font_01_sfnt_off0001197c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1197C 10716 bytes
SHA-256: 19a3db8ced582d2940cae8cabb37253b908c05e50ccfc986e37627e78809670e
font_02_sfnt_off0001320d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1320D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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