Malicious PDF — malware analysis report

Static analysis result for SHA-256 86eace73fb1eb2cd…

MALICIOUS

PDF

80.1 KB Created: 2021-08-07 07:36:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2c6a1926c287151c09a5d278cf63590e SHA-1: 7c056772186c5bfb7a68aa893d44231e5389d46d SHA-256: 86eace73fb1eb2cdda452470b45bff3533096634f4293fbe6671b24724934067
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories and other potentially disposable hosting sites, suggesting a link farm or redirection mechanism. The primary purpose appears to be directing users to malicious external sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://lamelove-zakryti.cz/userfiles/file/73114654154.pdf In PDF document text
    • http://dchs1961.com/clients/871949/File/jomovojizarebamagugav.pdfIn PDF document text
    • http://ahlhy.com/uploads/file/252045285011.pdfIn PDF document text
    • https://atraba-holding.com/userfiles/file/lidijowo.pdfIn PDF document text
    • https://phase1acoustics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f1c9226c885---14338908183.pdfIn PDF document text
    • https://abofahed.com/userfiles/file/powugadezuloponununekede.pdfIn PDF document text
    • http://beerskiboot.de/img/upload/file/73946532018.pdfIn PDF document text
    • https://electrabicycles.pl/app/webroot/uploads/file/16223011860789.pdfIn PDF document text
    • https://dixietemporarystorage.com/wp-content/plugins/super-forms/uploads/php/files/b85ac2b66dfb9a34ddbe920157d53bf6/buxuxorikusegebod.pdfIn PDF document text
    • http://rund.cz/UserFiles/File/bagivoterovudenimoge.pdfIn PDF document text
    • https://piuspvc.it/userfiles/file/98723375025.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/puxolepuxomutuzonu.pdfIn PDF document text
    • https://tungqibiotech.com/upfiles/editor/files/58953600808.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b67aade1d6d---22125841390.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/6d39ce443d1f2bd3aa5b1cf10dccc26c/23300249170.pdfIn PDF document text
    • http://iwish-cosmetics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f73af8905ad---moduriz.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6f53e00d12ad8040bf9e9bd59544180/debawezikag.pdfIn PDF document text
    • http://centroolosprato.it/userfiles/files/tupukupidipokumovu.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ac9d8fc44ea---mejakosimopepiluw.pdfIn PDF document text
    • http://fsoa.cn/userfiles/file/88563038911.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16107cef08cbff---59455517048.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/wasasifuzoxum.pdfIn PDF document text
    • https://arnetbilgisayar.com/upload/ckfinder/files/mifevirawipisewamu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=ap+biology+lab+3+mitosis+and+meiosis+answer+keyPDF 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_off0000d36e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD36E 17348 bytes
SHA-256: bc27a81f2b9f2e3dc73bcced18bb66f532f87fc0b996bfff16ae836031916b09
font_01_sfnt_off000100da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100DA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000118f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118F1 11320 bytes
SHA-256: 2feb127eb5b5199d8224a07531ffad87f3ecd03cd947a9f595a7342c21c71ee4

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