Malicious PDF — malware analysis report

Static analysis result for SHA-256 637de0efd4ff2ad8…

MALICIOUS

PDF

78.7 KB Created: 2021-08-02 16:13:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a0873e59b5b0c1daa6ae920fa61cbb1 SHA-1: c201016e824a11efa503bc69cd4f75eec2151ac1 SHA-256: 637de0efd4ff2ad8638650ae07e110fb1094d6c21f9bcecba98a9d1b6094ba1b
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains multiple links pointing to compromised CMS upload storage and disposable hosting, suggesting a link farm designed to redirect users. The presence of these links and the PDF structure strongly suggest a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://www.inkfactory.pk/wp-content/plugins/formcraft/file-upload/server/content/files/160b0d97f4231e---besoso.pdf In PDF document text
    • https://ikansambel.com/contents//files/12836908950.pdfIn PDF document text
    • https://mimpiindah168.com/contents//files/25592124216.pdfIn PDF document text
    • http://monkeytailranchdonation.org/clients/e/e8/e82116dd0b5861b0917add2a69208af2/File/2967087421.pdfIn PDF document text
    • https://namlongadc.vn/uploads/news/files/vijumowu.pdfIn PDF document text
    • http://www.knickmeier.net/images/pageimg/file/54249647367.pdfIn PDF document text
    • https://www.ideaklinikbursa.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bda0a0b6c---56501904343.pdfIn PDF document text
    • http://szpital-sulecin.pl/images/fckfiles/file/davalevopi.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160e58d580a127---mekaponakijakezadotak.pdfIn PDF document text
    • https://x-software.cz/data/file/lanifafazej.pdfIn PDF document text
    • http://sutinlawkrabi.com/ckfinder/userfiles/files/93449386091.pdfIn PDF document text
    • http://omeofest.eu/userfiles/files/70713876463.pdfIn PDF document text
    • http://aven.su/userfiles/file/4117570682.pdfIn PDF document text
    • http://c2mag.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ede754a30d---wuninutikunosesidudu.pdfIn PDF document text
    • http://ural-resyrs.ru/data/file/rozudonujaze.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/160ccacfc4ee3b---ketumavuvukewimotesoda.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/pozovujawowesunefurevita.pdfIn PDF document text
    • https://anzmrrn.org/wp-content/plugins/formcraft/file-upload/server/content/files/160a49c7e0408e---kowitowesasariwibinaj.pdfIn PDF document text
    • https://copab.tn/216mag.svn/uploads/files/19759488436.pdfIn PDF document text
    • http://metzpaintings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b94899cc3fc---16046492891.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088610a50020---70654173523.pdfIn PDF document text
    • http://xn----8sbxab3abskk3a2j.xn--p1ai/media/file/wozaximavutetudibanogixex.pdfIn PDF document text
    • http://www.reroofingbrisbaneqld.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1606d2f8d702d7---31141426370.pdfIn PDF document text
    • https://formapolis.it/wp-content/plugins/super-forms/uploads/php/files/b5d0f17eef32ef9c32e073dc7db5e1fc/pubepuburenufi.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16090fad31daee---vafera.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=cheese+and+pickle+sandwich+nutritional+informationPDF 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_off0000cefd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEFD 11192 bytes
SHA-256: d4ced61af8151ad9cdc5d6be64b779c5f9bb0f64b9da3bc1a2c028b191770529
font_01_sfnt_off0000e90f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE90F 16812 bytes
SHA-256: 2d097ffeadddfa5d90fe680e9287ee66245250f0aac10f07522faa17db7a4557
font_02_sfnt_off000114cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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