Malicious PDF — malware analysis report

Static analysis result for SHA-256 de48adfc37f2823d…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 02:19:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 879f361a861ae67f622740d2a0f24f8d SHA-1: 0bff0272407bdb2d04334891dc088174f24073e4 SHA-256: de48adfc37f2823d3185c4e2d3aa3f7754162f1858e937f000918d56535e5b5a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised websites and disposable hosting, suggesting a phishing or malware distribution campaign. The presence of PDF-specific heuristics and embedded URLs further supports this assessment, likely serving as a lure to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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 https://infrive.ru/uplcv?utm_term=estructura+celular+bacteriana+pdf PDF link annotation
    • http://www.deadclan.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f16d4513e---pawajagazifunu.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b09ccf6c355---zapasakabemobijatik.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/dff723f6bfcfd5eea5518477f920f693/dowupu.pdfIn PDF document text
    • http://gopherandsquirrelcontrol.com/admin/images/file/56440907108.pdfIn PDF document text
    • https://lasanisports.com/files/xobasozitemejek.pdfIn PDF document text
    • http://www.lauricedale.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1609d1c0d20a9f---biwin.pdfIn PDF document text
    • http://videoacceso.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090fe69678a4---45162498093.pdfIn PDF document text
    • https://ercrs.org/wp-content/plugins/super-forms/uploads/php/files/nflfuvevn11fcmnpl9h0cf80pj/8664285580.pdfIn PDF document text
    • https://searchlink.org/userfiles//file/zijuwalopo.pdfIn PDF document text
    • https://adian.eus/files/galeria/files/34051224976.pdfIn PDF document text
    • http://air-con.ru/upload/files/12598223501.pdfIn PDF document text
    • https://zweiund40.com/wp-content/plugins/super-forms/uploads/php/files/9c39lh3msphf0810ujcqp0g9cb/46911101543.pdfIn PDF document text
    • https://bya-ingenieria.com/ckfinder/userfiles/files/govimegene.pdfIn PDF document text
    • https://vatlieutaphu.com/upload/files/88675560688.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084d2a196e5d---gepubiximifewutopededa.pdfIn PDF document text
    • http://meble-tk.pl/userfiles/file/betawezavosuwetuvisubojir.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/kabuza.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/49f49b2d82463d463a3668ed974f777a/fafaregagexur.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/1fc41fb9bf91bc44b1d0414653e62c21/25271565495.pdfIn PDF document text
    • https://eviinstall.com/userfiles/files/momowizuzok.pdfIn PDF document text
    • http://elijasprojekts.lv/files/file/mebamedomurowivawowas.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/jutuvokomovutus.pdfIn PDF document text
    • http://wf515345.tw/CKEdit/upload/files/borewipuzikinumobe.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_off0000dd55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD55 18192 bytes
SHA-256: 01342722c4ef95cb4c1d63c47f8131a1fc9bf701a683a983d527768e5f165c40
font_01_sfnt_off00010d05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D05 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001251c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1251C 10716 bytes
SHA-256: eab237a6bb4417bf05455341fe50bd93c7e68df674f9a551c6ab7155b252bb0e

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