Malicious PDF — malware analysis report

Static analysis result for SHA-256 561266ee5427e516…

MALICIOUS

PDF

93.3 KB Created: 2021-07-18 10:48:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6b4b9c297463f58c02949fe297b61f85 SHA-1: dee37906708273326ea5b64ab01d670d64efe693 SHA-256: 561266ee5427e5162a639a529e5dc9f0ee3120f4f4447f21eef2fbb34898a51d
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm for SEO manipulation or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

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 http://jcon-aps.dk/userfiles/file/pifegudosen.pdf In PDF document text
    • https://actor-conseil.com/files/file/50960258981.pdfIn PDF document text
    • http://asustainable.com/global/file/19088137072.pdfIn PDF document text
    • http://www.emporiocaritaspisa.it/wordpress/wp-content/plugins/formcraft/file-upload/server/content/files/160b18f0822f7c---89208166581.pdfIn PDF document text
    • http://gayaarchi.com/userfiles/file/20210715181711.pdfIn PDF document text
    • https://xo-sound.ru/userfiles/file/kenudolibud.pdfIn PDF document text
    • http://beautybybelief.com/admin/images/file/31443919666.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160762dddc309d---34686117231.pdfIn PDF document text
    • https://tucsonhomewindowtint.com/wp-content/plugins/super-forms/uploads/php/files/57d08e50df03c8386f9f33ae5e3f1c40/43112491167.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099a0a353088---53108840527.pdfIn PDF document text
    • https://www.vibrationmonitoring.asia/wp-content/plugins/formcraft/file-upload/server/content/files/160c9d1e97d9cb---sadonoromozuji.pdfIn PDF document text
    • http://friluftsgruppen.se/wp-content/plugins/formcraft/file-upload/server/content/files/16076372c1962b---vefixuxuwofajikavinimidab.pdfIn PDF document text
    • http://thaoduocquyhiem.com/userfiles/image/file/8259718706.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607de6321243c---80764252911.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/jazovufagun.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f7bae7958b---13587294007.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/gofitelenul.pdfIn PDF document text
    • https://stcc-sa.com/motakamel/Ups/files/fanuwekivawe.pdfIn PDF document text
    • https://cowichanseniors.ca/userfiles/file/66164690156.pdfIn PDF document text
    • http://kangs78.com/clients/66216/File/54970186069.pdfIn PDF document text
    • https://mecaniquekd.ca/upload/file/gofixu.pdfIn PDF document text
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2b7cbbace---xujewebuvekomagofaguwud.pdfIn PDF document text
    • http://ecbpolska.pl/wp-content/plugins/super-forms/uploads/php/files/1b29ef237d4d2a8e006301566ec78f08/telotoludoxupen.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=mehndi+designs+front+hand+simple+and+easyPDF 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_off000109ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109AE 16592 bytes
SHA-256: 6442d93b726a7bb7f717c0668fea2df958e75f940c69a33addf47b0e44543f45
font_01_sfnt_off000134af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x134AF 11052 bytes
SHA-256: dca1444082410641d6d15107aa30476369ce8f8c1b4a15bbdf56f85ede6a9e53
font_02_sfnt_off00014e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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