Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37f6814b2b2d828…

MALICIOUS

PDF

82.1 KB Created: 2021-09-04 05:30:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2c82d30b18e5790fb1d309777258a67 SHA-1: daad11a58640cd0f250e8e3533812558153ec893 SHA-256: d37f6814b2b2d8282e4b0461863ff9bd84ae610c7d8f2fe53655e2b47a461b20
156 Risk Score

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress upload directories, which likely serve as a distribution point for further malicious content. The document body is heavily obfuscated and appears to be generated by wkhtmltopdf, suggesting it's not intended for direct user reading but rather as a container for malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://www.liveartsaskatchewan.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd9cb8b69b0---kilopiboj.pdf In PDF document text
    • http://pescepiana.eu/userfiles/files/ponojevikukofolupufon.pdfIn PDF document text
    • https://apoiotelecom.com/imagens/img_fckeditor/file/wugadak.pdfIn PDF document text
    • http://www.fullmooneye.com/wp-content/plugins/formcraft/file-upload/server/content/files/160829825dfbb5---7654380479.pdfIn PDF document text
    • https://www.northamericatalk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a4874c03b---34210773760.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16078252b759b4---zalumopavuma.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/61266600207.pdfIn PDF document text
    • http://xn--80ahcjevtqq.xn--p1ai/ckfinder/userfiles/files/tojabazuposirukowixe.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/99369178872.pdfIn PDF document text
    • https://readxyz.org/wp-content/plugins/super-forms/uploads/php/files/4853558103b9bab5d268c1ddaf26793e/62943857313.pdfIn PDF document text
    • http://www.inhd.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090292513c42---31740126606.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/75e39e0bd4db9b977f8c355e5c1fd536/wamubegenavigitedukomuriv.pdfIn PDF document text
    • https://kvartira-zalog.ru/wp-content/plugins/super-forms/uploads/php/files/00ef5ebf5b3e56ba5aa7901cce0b549a/29273760741.pdfIn PDF document text
    • https://www.golaw.net/wp-content/plugins/formcraft/file-upload/server/content/files/160b7dbe184fa8---58434878706.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3bb4e9153---65907723766.pdfIn PDF document text
    • http://alkanboya.com/files/file///nugejololakane.pdfIn PDF document text
    • https://chameleoncoupons.com/adgprocessing/uploads/files/xolajaduwutubokitivisib.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/90315445152.pdfIn PDF document text
    • http://clinicacomciencia.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bb0527c5f4d---47554633431.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/tetazowuniraj.pdfIn PDF document text
    • https://daotaolaixesontay.com/uploads/file/gekivewiru.pdfIn PDF document text
    • http://diplomat2014.ru/ckfinder/userfiles/files/53175154416.pdfIn PDF document text
    • https://directprocessors.com/wp-content/plugins/formcraft/file-upload/server/content/files/161157327cb3de---98430991025.pdfIn PDF document text
    • https://djhelaly.com/wp-content/plugins/super-forms/uploads/php/files/fa6d8415b3910b9d2730a27b37ff922d/7227901518.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=reduce+the+size+of+a+pdf+acrobat+readerPDF 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_off0000ddf1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDF1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF603 16760 bytes
SHA-256: 612b23aa5de79b598f87d2faa18bac57ebe55683e1e307424dca42cc1a34ea7a
font_02_sfnt_off00012174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12174 10912 bytes
SHA-256: 60ec67685a5a38ffd76a880ac4c2d9f9ac97624a36e29c38f913be43f5db1139

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