Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a7c8e99699a23fe…

MALICIOUS

PDF

87.1 KB Created: 2021-07-01 00:07:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4f3b0c4b15e99840fbb12f22cc3732ff SHA-1: f355b0e3e0481cc013a52b1d78bccad10fa22c0c SHA-256: 9a7c8e99699a23fe5a7c5c39714e8ad23b28a9bc0929ec2ffc45aa938cf1d82b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites hosting other PDF files. Heuristics indicate this is a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c909d8851f9---94049742509.pdf
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a4f03def00f---dekalipago.pdf
    • http://www.supercarrentalsofmiami.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607df80f918ee---29341840080.pdf
    • http://nandeestationery.com/userfiles/files/butujunab.pdf
    • http://goldmustang.com/files/files/70586600495.pdf
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160c606f31545a---xerigotezivijisibodude.pdf
    • http://bamt.be/wp-content/plugins/formcraft/file-upload/server/content/files/160722fc8da609---zunoxikadijajuked.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/puvesaga.pdf
    • http://becro-plast.hr/wp-content/plugins/formcraft/file-upload/server/content/files/160cbd3c51451a---95363163263.pdf
    • https://www.medicalart.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607fdf4100d43---90295915799.pdf
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/a4aaf8f5c52549236b572ec8cecba332/88866872578.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608878e041f87---6320340523.pdf
    • http://ayurvedicclinic.org/userfiles/file/bipefunutobu.pdf
    • http://dobrasekacka.cz/userfiles/file/nupaxaru.pdf
    • https://kawanmto.net/contents//files/wevezepaxebetesotovavuxum.pdf
    • https://www.uniqueartzz.com/wp-content/plugins/super-forms/uploads/php/files/0h1gh1ogdgj4qn9u48hj0lu3f1/26439094627.pdf
    • http://bostonmentors.com/userfiles/file/sufepujidu.pdf
    • https://extremetour74.ru/wp-content/plugins/super-forms/uploads/php/files/db540577071e3247e991c908624a519f/dolexowanowawosu.pdf
    • https://donnasalon.ru/wp-content/plugins/super-forms/uploads/php/files/1a2982a1c09241ca460d9a682183b092/naxowuguda.pdf
    • http://gemculture.com/userfiles/file/14912615208.pdf
    • http://bukharasuwanee.com/sites/default/files/file/21936263051.pdf
    • https://gyn-koe70.de/obrazky/file/gowurevimogejaxifirur.pdf
    • http://chongthamnguoc.vn/img/files/87563787771.pdf
    • https://hyundaia.ru/userfiles/file/nozugekesujurob.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=decolonizing+the+body
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0c1.bin
ffae26de75534d1bcda148005a06878878ab612b896208e3e9af939d36212c34
pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C1 10536 bytes
font_01_sfnt_off00010876.bin
226e571a3b9599af3ae01472b6546d6c9b05af9f42c7c71f1c5bc5eb92163abf
pdf-font-stream PDF embedded font (sfnt) at offset 0x10876 17576 bytes
font_02_sfnt_off000135e0.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x135E0 16792 bytes