Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b4822f09e13820e…

MALICIOUS

PDF

81.4 KB Created: 2021-09-05 18:15:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 67312e8224ebb69d071d06ad5faa50b5 SHA-1: 29203d2e27037320b979d61f0e23a851639cfdc3 SHA-256: 4b4822f09e13820e2c39ff77614d6c274282ccba5927266aac67539e906365d5
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, directing users to multiple external URLs, some hosted on compromised WordPress sites. The presence of numerous links and the use of 'utm_term' parameters suggest an attempt to manipulate search engine results or direct users to phishing or malware distribution sites.

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://catamma.ru/uplcv?utm_term=negative+enlargement+worksheet+and+answers PDF link annotation
    • https://alixdemassy.fr/userfiles/file/jazudowiletefetelatow.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/wesode.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/78681445950.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/c552fc24f6e890d24c404ad6697b6957/kefusujolawogonel.pdfIn PDF document text
    • http://fw-simple.com/uploads/files/82683850576.pdfIn PDF document text
    • http://szyldkj.com/luodan/images/userfiles/file/40889298173.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/58024532149.pdfIn PDF document text
    • https://ecole-anglais.com/upload/files/22975515992.pdfIn PDF document text
    • http://2440027.ru/upload/file/43119593754.pdfIn PDF document text
    • https://wpsqld.com.au/wp-content/plugins/super-forms/uploads/php/files/1b9f147eaaa3dfbab5f67b2e7415c242/72831746964.pdfIn PDF document text
    • http://xn--80aafbanafwvcftiqfecrg2a.xn--p1ai/pict/file/levitabokokuzalexin.pdfIn PDF document text
    • http://aranykoronakft.hu/userfiles/file/57949055028.pdfIn PDF document text
    • http://sysquare.com/UserFiles/files/16043555439.pdfIn PDF document text
    • https://vinasimex.com/uploads/file/diwoligugafivuxen.pdfIn PDF document text
    • http://kennyre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612fe9c7afb61---99924225769.pdfIn PDF document text
    • http://hzeiger.com/userfiles/file/gatepofolob.pdfIn PDF document text
    • http://homeopathyhongkong.cn/files/30121978128.pdfIn PDF document text
    • http://inspirationallabels.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607e9f2cc4a01---sadumufare.pdfIn PDF document text
    • https://bocion.com/ckfinder/userfiles/files/45346745532.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021082907275074.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/gilubufezun.pdfIn PDF document text
    • http://kssi.ir/public/userfiles/file/xikawisok.pdfIn PDF document text
    • http://schokobrunnen.com/idata/33499378253.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/l67pn68tk01n5t0o1ld0jgsgdf/zigubireni.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/r5ksmjaurjipvhn4p8vojt2dju/pifapufebavid.pdfIn PDF document text
    • http://synphabase.ch/upload/file/gulamajomigixenazo.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_off0000d857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD857 10916 bytes
SHA-256: 11ae4c72fd098ab54aa0da0b14196990eb54dbb565873b8def204f439d81ad08
font_01_sfnt_off0000f149.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF149 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001095b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095B 18080 bytes
SHA-256: 8c43a00f7f9e5cf682b07511b583f4122e2af307233dcc5fa124b324ea266c18

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