Malicious PDF — malware analysis report

Static analysis result for SHA-256 eba7ab4be5433e9b…

MALICIOUS

PDF

82.7 KB Created: 2021-10-05 08:55:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 73672b36c56909a9fe46bf6ec3ad941c SHA-1: ead325edb839cf8332da3afbe468a84c89583d80 SHA-256: eba7ab4be5433e9be2284e6c3a5fdd4b6524211a214bcc0f712f70832e75da6e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. While no scripts were directly extracted, the nature of PDF link farms often involves JavaScript to facilitate redirection or exploit vulnerabilities, hence the inclusion of T1059.007.

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 https://www.zaantraining.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1614b66655fd66---finiti.pdf In PDF document text
    • http://youil.org/userData/board/file/voworiralitapiberum.pdfIn PDF document text
    • http://artospace.com/pics/file/82093449668.pdfIn PDF document text
    • http://satyamtracparts.com/userfiles/file/6005645417.pdfIn PDF document text
    • http://envigest.cz/upload/file/fomobotupixo.pdfIn PDF document text
    • http://mylead.mandiricareer.net/contents/files/nofodawupexefopisewemewaf.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e193af8c---dovidi.pdfIn PDF document text
    • http://chinawin-consult.com/userfiles/rovemuvutejob.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/vobozudi.pdfIn PDF document text
    • http://elpijisystem.com/file/biluxasiguzu.pdfIn PDF document text
    • https://araprinter.com/ckfinder/userfiles/files/fitil.pdfIn PDF document text
    • http://iaestedresden.de/userfiles/file/zozuguwu.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/xesepegoru.pdfIn PDF document text
    • http://finsura-lifedirect.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161393f70db066---japufepepe.pdfIn PDF document text
    • http://www.timtransportes.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1614df0f12a147---30421115243.pdfIn PDF document text
    • https://www.emcp-pmce.ca/_includes/ckfinder/userfiles/files/puporaw.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/bonoradoburufosode.pdfIn PDF document text
    • http://epmachine.ru/d/files/82015853829.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16158a93a406ac---mirememufakevurux.pdfIn PDF document text
    • http://choragwica.pl/userfiles/file/1878045341.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/dimarulipipiwawiluveb.pdfIn PDF document text
    • http://folientastaturen.pl/_data/file/xikavazuvulij.pdfIn PDF document text
    • https://yingzhaoliuart.com/upload/file/53778746894.pdfIn PDF document text
    • http://geostudio.eu/userfiles/files/13808157172.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=sleeve+gastrectomy+to+gastric+bypassPDF 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_off0000dd35.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD35 18076 bytes
SHA-256: 7116ca77374aeec5a9bcf5617120b0af80cc47dea8e650d1123315cf93e8e511
font_01_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 11008 bytes
SHA-256: f5233a2b1fe040abb063785a88b6e4e2b85253450365c72924b79b0770774bd1
font_02_sfnt_off000124a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124A8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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