Malicious PDF — malware analysis report

Static analysis result for SHA-256 bec54573d88af79d…

MALICIOUS

PDF

81.7 KB Created: 2021-09-03 19:07:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: d290df91ea1d1861c2803ec780a1f200 SHA-1: 4f40d10943e774d19c469f42a6e821553f08784b SHA-256: bec54573d88af79d10c7ea37dec7f033277139de4bfbeb1d3766fedfab0254c0
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of embedded URLs, many of which point to compromised websites or link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the nature of the embedded links and the PDF structure suggest it is designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9846

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://oniceh.ru/uplcv?utm_term=querela+pacis+pdf PDF link annotation
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/6b40b7ae23a0f9185358ee50200d78df/dopupagivo.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/47479055590.pdfIn PDF document text
    • http://pickup-ws.com/userfiles/files/fajikemesam.pdfIn PDF document text
    • https://mission4recruitment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc1a38cacc---68238517786.pdfIn PDF document text
    • http://wami.cc/data/files/78229427729.pdfIn PDF document text
    • http://louisefarmersmith.com/admin/ckeditor/ckfinder/userfiles/files/vodabelajuboxepomu.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/fevududa.pdfIn PDF document text
    • https://deconkhoemanh.com/wp-content/plugins/super-forms/uploads/php/files/pi109b0hp75c6el6i2vjj6h4tg/15315009899.pdfIn PDF document text
    • http://shesob.com/file/files/jesixuwawezuranetubukota.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160ae6dffbfc8d---bigudedotuselodoriw.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/91687407795.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/luxipujipetadizexa.pdfIn PDF document text
    • https://bodymart.in/ckfinder/userfiles/files/9888890523.pdfIn PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/bol5egnbk02o8t3nltb609e5h1/jisofaladobu.pdfIn PDF document text
    • https://calldidocta.com/wp-content/plugins/super-forms/uploads/php/files/9b1147e6c2503c60a66d6310512c68e5/bofivozuxevafenuzidozuw.pdfIn PDF document text
    • http://naturalmis.com/userfiles/file/75922244979.pdfIn PDF document text
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160f85623d95d4---penuwedadaludorumorigek.pdfIn PDF document text
    • http://ruresept.ru/files/file/33727841759.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/sixuxideloxagegitupez.pdfIn PDF document text
    • http://audiomaster.se/wp-content/plugins/formcraft/file-upload/server/content/files/1607cb7b80f907---vipafadebakupegukuzub.pdfIn PDF document text
    • http://jonesfamilygathering.com/clients/2/28/28a2af4908f4fae7f70f8b91082c1e08/File/sivinitumuwekukonarabe.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a97e02ac0---87293534891.pdfIn PDF document text
    • http://afgventuregroup.com/cfiles/file/milemuropidas.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/lejiwefagajajota.pdfIn PDF document text
    • https://www.endthestigmacounselling.com/wp-content/plugins/super-forms/uploads/php/files/a04ejbtsc5l894j2vjl1v0ob55/jajaxulugokunoxazumumu.pdfIn PDF document text
    • http://suvenirzp.com/uploads/files/6514799986.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_off0000d380.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD380 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000eb92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB92 21180 bytes
SHA-256: 1f52def61896bde9a8093a75c2054e4dcc83880c9db0d6c6242a774e65745d3f
font_02_sfnt_off00012010.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12010 10452 bytes
SHA-256: ad97949c034e8e4a807d8c601d7a94159559ad80d6390602267128b17512282c

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