Malicious PDF — malware analysis report

Static analysis result for SHA-256 c71e88c02ad62a76…

MALICIOUS

PDF

72.6 KB Created: 2021-09-15 18:56:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: bc2b388cd927b9f19764650da530bb54 SHA-1: e300aed6381ea0977a544d91e2d3f2a42d75a70e SHA-256: c71e88c02ad62a76c3f5336ae1ad1dcf5cae63ae03b3cdbe59958cdc00805714
156 Risk Score

Malware Insights

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

The sample is a PDF file identified by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, directing users to multiple disposable hosting sites. The ML classifier also strongly flagged this PDF as malicious, supporting the phishing and malware distribution intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9940

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://guides2alpes.org/uploads/file/84344572648.pdf In PDF document text
    • http://cloverdiamond.com/file/gigaba.pdfIn PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16132b969344e7---30090985557.pdfIn PDF document text
    • http://turhantur.com/turhantur/files/51149257528.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/16137249020a01---pabovuki.pdfIn PDF document text
    • https://designmaster.in/scgtest/eec-new/codelibrary/ckeditor/ckfinder/userfiles/files/muginavixekifonojefa.pdfIn PDF document text
    • http://www.tahi.hu/ckfinder/userfiles/files/wikanifewomibik.pdfIn PDF document text
    • http://sattosushi.com/uploads/files/87129733386.pdfIn PDF document text
    • https://www.baptistenhardenberg.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1612ef10ea63d1---zasevonefu.pdfIn PDF document text
    • https://tefen67.com/userfiles/files/wupuluwinonurulamusuref.pdfIn PDF document text
    • https://plumcourse.com/wp-content/plugins/super-forms/uploads/php/files/05dbf24a824133f1243cb88e801deb3c/18750338083.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/33331461485.pdfIn PDF document text
    • http://3mfa.com/images/editor/files/nemigiro.pdfIn PDF document text
    • http://laboratoriologos.it/userfiles/files/62242245378.pdfIn PDF document text
    • http://labuchedeberce.fr/userfiles/file/wejofug.pdfIn PDF document text
    • https://www.retake.dk/ckfinder/userfiles/files/74330176533.pdfIn PDF document text
    • http://www.bsa.by/ckfinder/userfiles/files/92119547892.pdfIn PDF document text
    • https://vidaleve.net/ckfinder/userfiles/files/wedebevawotitiz.pdfIn PDF document text
    • https://omprintandpack.com/userfiles/file/koselimowo.pdfIn PDF document text
    • http://aromacosmetics.bg/assets/userfiles/file/doxud.pdfIn PDF document text
    • https://volpatoebrum.com.br/_common/admin/scripts/ckfinder/userfiles/files/mevonikotujuveron.pdfIn PDF document text
    • http://themetamorphoseprogram.com/userfiles/file/90167578219.pdfIn PDF document text
    • https://virker-ikke.dk/files/56199792747.pdfIn PDF document text
    • http://nguyenphat.com/public/default/ckeditor/files/pefitujavesafuw.pdfIn PDF document text
    • http://e-kva.ru/admin/ckfinder/userfiles/files/47157781685.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=drishyam+2+movierulzPDF link annotation
    • http://perfecturology.cafe24.com/upload/editor/imagefile/xikuminukumevuruvum.pdfIn PDF document text
    • 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_off0000ba8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA8E 16232 bytes
SHA-256: 2ede7a0695cc1adc031bb5da495227330246d3719fb0ee25a517281384192ead
font_01_sfnt_off0000e47c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE47C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fc93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC93 10632 bytes
SHA-256: 9a03b26c366e96124ada43d612d20feb397aa6084846170363aa4544ca15efc9