Malicious PDF — malware analysis report

Static analysis result for SHA-256 ad208f3c9bd554a9…

MALICIOUS

PDF

83.7 KB Created: 2021-08-17 10:23:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3cbd88ad181300c47ef5448e4f7ab42 SHA-1: b9ba83cd7946dbf3701654c1bf913d5640b34188 SHA-256: ad208f3c9bd554a969dbe0d3b526dcf3f7d8efb75aec8c5bca4ca00cefca6f48
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous URLs, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm. These links likely lead to phishing sites or further malware downloads, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://krisoc.ru/uplcv?utm_term=descargar+el+libro+de+los+jubileos+pdf PDF link annotation
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16086584d9835c---dijodo.pdfIn PDF document text
    • https://ddtoyz.com/ckfinder/userfiles/files/jodazesofuxifo.pdfIn PDF document text
    • http://veganogle.es/uploads/ckfinder/files/24219614517.pdfIn PDF document text
    • http://aarogyamedico.com/userfiles/file/6391760100.pdfIn PDF document text
    • https://realestateconnect.biz/wp-content/plugins/super-forms/uploads/php/files/l9qdf4hpvhvdg58i6btfonvb73/xawawudajejiro.pdfIn PDF document text
    • http://emeat.ru/var/files/felabolixukupufuxobewaf.pdfIn PDF document text
    • http://koopmankennedyfeller.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/4933427882.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/7b3v0u14n8vlp3o3cs6ebfgkpn/41219462145.pdfIn PDF document text
    • https://www.dyna-tech.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1609e2ccb8d984---pisaxagesik.pdfIn PDF document text
    • http://xn--80akij1ajew.xn--p1ai/wp-content/plugins/formcraft/file-upload/server/content/files/1606c7ec639a14---91432413130.pdfIn PDF document text
    • http://premiumresourcing.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608459e586681---fagegigonutilunusonaf.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606c81ee259ce---10145830410.pdfIn PDF document text
    • https://sk-developers.com/wp-content/plugins/formcraft/file-upload/server/content/files/16103be04bbbae---85059164338.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/40df2db0f699fb2cef34a94e9762eacc/wafazurutas.pdfIn PDF document text
    • http://epicridesnepal.com/files/62291245317.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/wuzaf.pdfIn PDF document text
    • https://hsegroup.ru/wp-content/plugins/super-forms/uploads/php/files/h3t9eh73aa3p77mkd9r1gnjeb5/sogozodukagerumezufofu.pdfIn PDF document text
    • http://cheers-gifts.com/userfiles/vumokizevubuwozeg.pdfIn PDF document text
    • http://ozanatalan.com/iboard/includes/userfiles/files/bemuzutunotilezixuwu.pdfIn PDF document text
    • http://nuraski.pl/wsg/userfiles/kotavobanizevo.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/fijixisovijofokalexit.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tufasonuxofalu.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16079d66e77f15---81414514488.pdfIn PDF document text
    • http://caratow.eu/userfiles/file/vinawujofataja.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c9c83fe3247---93722416224.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_off0000e2b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B6 17548 bytes
SHA-256: e4ad87069324353d8e36e7b697b27a528ededea127ad3ffcf3cfd0320b5f7e7f
font_01_sfnt_off00010f8f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F8F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127A6 10964 bytes
SHA-256: 6340bc502b9b47464cb76bbfc154c3da88899ffa069dbbe0ac40c7943e499fd2

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