Malicious PDF — malware analysis report

Static analysis result for SHA-256 be812697a081a392…

MALICIOUS

PDF

79.5 KB Created: 2021-08-08 05:48:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e881cdb82b9ea97ebcfb477ee2b23e91 SHA-1: 0a48aa28e68e16bba0abe9cffc203fe83642e61c SHA-256: be812697a081a392860ff48493b8a9ddb9ec17ac85efd06ba28e8769d4d6d013
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution scheme.

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 http://autoklej.pl/app/webroot/media/files/11793089669.pdf In PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/3l80cgfm7qooi9hvq5th2sgfa0/fewuwasevanisaladasajuk.pdfIn PDF document text
    • https://anjingliar.com/contents//files/5279186115.pdfIn PDF document text
    • https://silverstonedevelopments.com/ckfinder/userfiles/files/56414866665.pdfIn PDF document text
    • http://mini-garden.ru/userfiles/file/7274492207.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/39109559034.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/92210026242.pdfIn PDF document text
    • http://hasici-pristroje-eshop.cz/files/file/fejawofaduwus.pdfIn PDF document text
    • http://sciencevier.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bf5248317f2---sitedikaran.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/gugexagikutuju.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/wufesawugenejowisezidotix.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076f73b06356---79477880043.pdfIn PDF document text
    • https://perfecthospital.net/FCKeditor/file/pikozepi.pdfIn PDF document text
    • http://www.luminicaambiental.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cf3034116e7---tavaz.pdfIn PDF document text
    • https://arizonapoolcontractor.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c32b619e34f---tatuzapolakaz.pdfIn PDF document text
    • https://ancoraeducacion.com/images/kobejepibabavizeborupeget.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/c367a05ac6fac42b54256249cf3760c5/gagupapapisewudedanewu.pdfIn PDF document text
    • https://www.marthatrotts.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160908ba1d8860---96187930299.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16105f7f3a530c---senaririfenibokavudixiz.pdfIn PDF document text
    • http://solar-makernavi.com/ckfinder/userfiles/files/4724653892.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16077d87aefc9e---657792225.pdfIn PDF document text
    • https://www.ibyservice.com/wp-content/plugins/super-forms/uploads/php/files/4753cbe65773a5004b6a7b1a17b9a75e/jokogojutivaladotiseb.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607618b7120f8---64942799505.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/160844e722dc2c---gimuxuwuwujuti.pdfIn PDF document text
    • http://colorfulmedia.de/fotki/fotki/file/simagef.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=how+do+i+apply+at+woolworthsPDF 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_off0000d3e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3E3 16560 bytes
SHA-256: dc9867bd581b82ea201f033bbb443361db7d4a9efce313df7e86a3f0809e6b27
font_01_sfnt_off0000feed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEED 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011704.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11704 10444 bytes
SHA-256: b7518343046ae06be8177417c3e442560a3226c4ec0c1791cdffff60caaa92f6