Malicious PDF — malware analysis report

Static analysis result for SHA-256 a579a5a9b863ec26…

MALICIOUS

PDF

73.8 KB Created: 2021-09-07 20:14:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 4292e99370a1c4c42cd5e68a4735e1da SHA-1: 5b78c15511e872304b84cc3e72e3b203085023e6 SHA-256: a579a5a9b863ec2639f0f4cba9571aededbc8bed65fc914955e86cde909bf6fc
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, directing users to numerous external URLs, some of which are hosted on compromised CMS upload storage. The primary attack pattern involves luring users to potentially malicious websites through a collection of links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://barcelonacentromedico.es/files/galeria/files/60726805637.pdf In PDF document text
    • http://mamam.by/upload/File/file/tokaxinegolubufejifuruv.pdfIn PDF document text
    • http://amphorabeautyclub.com/campannas/file/noludixolonusufe.pdfIn PDF document text
    • https://serka.com/serka/upload/files/92820083415.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/7cmfuomrm6ncpa1jm9r5m1be40/69742973385.pdfIn PDF document text
    • http://st03.it/userfiles/files/74860388975.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4t7erop3pg8io4c33v78dn0bf4/44968435480.pdfIn PDF document text
    • https://avistravel.ro/userfiles/file/fimutimofuwoxino.pdfIn PDF document text
    • https://balance-global.com/wp-content/plugins/super-forms/uploads/php/files/1t6vaa02a5t6do34lnsgici58r/72700998722.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/b8cb91378fad2f7c154bd6e4686b9e7a/97583949523.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/5116d11f4bf5156aa84d7c74beafc586/3501381455.pdfIn PDF document text
    • http://vinag7furniture.com/app/webroot/files/editor_upload/files/44704139371.pdfIn PDF document text
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/d7e1981469f1c295b87539138454212a/20787101075.pdfIn PDF document text
    • http://edumedcare.pl/upload/files/2608232968.pdfIn PDF document text
    • http://stylist.in.ua/wp-content/plugins/formcraft/file-upload/server/content/files/160d7384e2cc8a---vopojovu.pdfIn PDF document text
    • https://detectiveoffice.net/userfiles/file/52696994106.pdfIn PDF document text
    • https://graffitipaintstudio.com/wp-content/plugins/super-forms/uploads/php/files/e9e0190b40dd30a703c5a000ab5782ba/noxutexa.pdfIn PDF document text
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160707b0ed92c0---kujuvagado.pdfIn PDF document text
    • http://decaiyun.com/upload/file/210906121706427962vamu6o64biyt.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/uimcrf4540fi3tfn6knlamg8t0/gedesegik.pdfIn PDF document text
    • https://kawanmto.com/contents//files/20905568247.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607abe170f737---godekox.pdfIn PDF document text
    • https://dukra.sk/editor_uploads/files/92487497522.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=science+form+4+chapter+7+pdfPDF 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_off0000bd7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7F 10876 bytes
SHA-256: 3ee00769de5993fc0a9ede4bce7318846d0704b2b31b72e64434c3d5847d7ad5
font_01_sfnt_off0000d687.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD687 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE99 17168 bytes
SHA-256: 42eb00134146d6002f2c43c3433dd9c058b9498cde7a592c9b6db1fe824761d9

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