Malicious PDF — malware analysis report

Static analysis result for SHA-256 5037c07a5e448783…

MALICIOUS

PDF

76.7 KB Created: 2021-09-17 13:25:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 27ff82bfd27c5f4725c4716725248ff2 SHA-1: f26cda2d904a1c65a9a143343a9c30a447a7fdd4 SHA-256: 5037c07a5e448783e10a0ae05e247ef2b36071a2f92851f23d1c566342e13964
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The primary purpose appears to be to lure users through these links, potentially leading to further exploitation or credential theft.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://shidoremicrosys.com/media/jikitudirogozimitov.pdf In PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/90856493422.pdfIn PDF document text
    • https://sgcaregiver.org/contents/files/wevege.pdfIn PDF document text
    • http://anapharmata.hu/ckfinder/core/connector/php/files/pukazivaxejivejale.pdfIn PDF document text
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1943e8f8---kunuvowa.pdfIn PDF document text
    • https://ismart99.net/upload/files/kojaparemavanaf.pdfIn PDF document text
    • http://chingyi.tw/userfiles/files/wozewipomive.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16137ed796c4c0---36445521137.pdfIn PDF document text
    • http://celyroknaterase.sk/editor_uploads/system/files/gosexag.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/91064728777.pdfIn PDF document text
    • https://cornwallstaffagency.com/userfiles/file/34680100982.pdfIn PDF document text
    • http://arenda-v-novosibirske.ru/ckfinder/userfiles/files/51381591803.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/161352810494ad---wewiwegidijeb.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/kekirafidajopinijikiponi.pdfIn PDF document text
    • https://ka-base.no/images_students/files/32561900604.pdfIn PDF document text
    • https://bayihoki99.com/contents/files/39993450460.pdfIn PDF document text
    • https://floridahouselottery.com/test/userfiles/file/97763074569.pdfIn PDF document text
    • http://bekkercoon.ru/ckfinder/userfiles/files/zajufavan.pdfIn PDF document text
    • http://abw10thstreetne.com/uploads/files/7056324247.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/balisumag.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613f436c0fbc2---48101442975.pdfIn PDF document text
    • http://airmon.hu/images/files/mugep.pdfIn PDF document text
    • http://francescofesta.it/userfiles/files/vigedaduxefazinegeg.pdfIn PDF document text
    • http://fsgzb.com/upfolder/e/files/20210910192127.pdfIn PDF document text
    • http://alompar.hu/uploads/content_files/files/jogebutusejadevokofa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=i9300+imei+0049+repairPDF 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_off0000c0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d8e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8E7 10368 bytes
SHA-256: ab8f71c183b3b423997e812ea99ce38fd69b2f895c56d4081b518dc5a8e371e8
font_02_sfnt_off0000f05c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05C 19952 bytes
SHA-256: 13ba7ff95afda441ef12f3d6dbfa488b0df1333d0bba1626d7ce9b63e896fff7