Malicious PDF — malware analysis report

Static analysis result for SHA-256 c84ef35707b9bad4…

MALICIOUS

PDF

88.6 KB Created: 2021-07-30 20:42:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e6b7e67c344064417ebf47622830080c SHA-1: bd3fc93507d8b1c57e244289050180224e16e827 SHA-256: c84ef35707b9bad44a529578be1ba06046a205125865f1870f62fae7168549e1
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous URLs pointing to compromised CMS uploads and disposable hosting, likely to redirect users to malicious content. The presence of multiple distinct hosts and a high number of links per host suggests a coordinated effort to distribute malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://nationshield.ae/userfiles/files/70945228595.pdf In PDF document text
    • http://kino-profi.com/wp-content/plugins/super-forms/uploads/php/files/ed16238d4f167274c66ea535de876398/11166193165.pdfIn PDF document text
    • http://geometrarontani.it/userfiles/files/55697088376.pdfIn PDF document text
    • http://findmecakes.com/userfiles/files/kamokomokewigudezuwaju.pdfIn PDF document text
    • http://libertyquad72.fr/userfiles/file/96185245059.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160a06454ab630---jeropefosusovaxujuwopi.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b1b441f0934---jexomijunukagunuje.pdfIn PDF document text
    • http://chalappuram.com/userfiles/file/fadivumoduzu.pdfIn PDF document text
    • http://pechati-piter.ru/userfiles/file/sofopupowifalaguvan.pdfIn PDF document text
    • http://aelma.com/sites/default/userfiles/file/77877103465.pdfIn PDF document text
    • http://svaz-podnikani.cz/files/file/vorojadim.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/vazafulopesawewun.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160b63b1233e90---nuramazekapefikivuwireso.pdfIn PDF document text
    • http://culbertsonlawyer.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/vigelajajulagodum.pdfIn PDF document text
    • http://bugaboo-buffalo.eu/UserFiles/File/gofutazijazumaw.pdfIn PDF document text
    • http://open.ua/uploads/ckeditor/files/13531479380.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/5189aa9f507dd6dadd607e151fa841eb/zebotagebadewu.pdfIn PDF document text
    • https://itracmediav5.com/ckfinder/userfiles/files/fapuralatavegewigiveteve.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f5838310156---69017435431.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/3bc1ce588367e9f441b0d402cab16116/denikekerixexivuju.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/4o4pjjhmij4fq81t9q08n0kg90/19426693286.pdfIn PDF document text
    • https://morethancleaningservices.com/wp-content/plugins/super-forms/uploads/php/files/5ee4126e4f635488b693db5b7c703ccc/jawizogik.pdfIn PDF document text
    • http://drive4smilesontario.com/clients/e/ed/ed023a0734c265ca673a92d1d81de675/File/fipoxez.pdfIn PDF document text
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bba5cbb857b---xagomavosidu.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/22256077461.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=how+do+i+claim+medicare+reimbursementPDF 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_off0000f634.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF634 16612 bytes
SHA-256: c1be658be4238f5132f402fab0e0ab1689b17db2d818bcc9c0944f80e43403b9
font_01_sfnt_off00012175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12175 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001398c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1398C 10848 bytes
SHA-256: 3759cffd227eb2bca244afc43f5eb68c8edf7ccf2dc676ef83ed10b7f92b2572