Malicious PDF — malware analysis report

Static analysis result for SHA-256 e1f500baefab5131…

MALICIOUS

PDF

75.8 KB Created: 2021-09-13 02:41:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 57d7e415627238b02a23b1a00dfff004 SHA-1: 74ba4da3a06f5e7fca21fcb1789f10de75db165e SHA-256: e1f500baefab5131c69b388b3beff20625fe0c492d6f8c74bb8978ccb068f5a1
156 Risk Score

Malware Insights

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

The PDF contains numerous links pointing to compromised WordPress uploads and disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The primary attack pattern involves leveraging these external links to achieve a malicious outcome.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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 http://2m-m.eu/userfiles/files/71346193365.pdf In PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b9242db2b3---vimifubujeb.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613190b7243e5---49591440737.pdfIn PDF document text
    • http://misr-consult.com/userfiles/file/lujasik.pdfIn PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/8162879c6a911def27b0d425a17574f9/tuxovitiduvu.pdfIn PDF document text
    • https://fuze-pay.com/ckfinder/userfiles/files/9589615177.pdfIn PDF document text
    • http://rybarict.cz/webpagebuilder/ckfinder/userfiles/files/4984140005.pdfIn PDF document text
    • http://crmrealty360degree.in/userfiles/file/figikavad.pdfIn PDF document text
    • https://krygina40.ru/UserFiles/File/87830969715.pdfIn PDF document text
    • https://digireg.dk/upload/74906134975.pdfIn PDF document text
    • https://kaxtongroup.com/home5/maxconne/public_html/kaxtongroup/assets/images/newspostimages/files/18851474368.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/wozepujilaturutifowu.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/4020813749.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137f75363a5b---43431351941.pdfIn PDF document text
    • http://rc-mst.com/mst/_upload/files/85852239253.pdfIn PDF document text
    • https://siam-royal-view.ru/data/files/wojoliwufage.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/38605501636.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/6c0a836d6bb5553bedbe87781501018e/fujazofitezunakerenagiri.pdfIn PDF document text
    • https://mysmartedu.com/uploadimages/files/mufesaregabujopuja.pdfIn PDF document text
    • http://www.moyekolodin.com/files/42142668900.pdfIn PDF document text
    • http://ng-sons.com/userfiles/file/gejuromumalin.pdfIn PDF document text
    • http://flexa.cz/docs/file/15267672827.pdfIn PDF document text
    • http://www.petercar0937494634.com/upload/img/files/33238820498.pdfIn PDF document text
    • http://vpecargo.com/userfiles/file/setifilidawawer.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/sokes.pdfIn PDF document text
    • https://copperscrap.wasteequipment.net/ckfinder/userfiles/files/mafodosezevona.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=mt4+widget+androidPDF 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_off0000c6c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C7 16988 bytes
SHA-256: 1db77e53145b306a13f1562557d368d083f2622833e5e97f00eabf90a744d8bd
font_01_sfnt_off0000f2a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A6 10368 bytes
SHA-256: d1df3e15cee95d57a813913fda0f57b8b1710d311702c94e6857adbeee382af1
font_02_sfnt_off00010a13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A13 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1