Malicious PDF — malware analysis report

Static analysis result for SHA-256 8210bf431bdc64f2…

MALICIOUS

PDF

92.2 KB Created: 2021-09-13 22:18:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: c43007279e364901c9854fff71694104 SHA-1: 2597c0af608f4361d99eae089e945074d40d5d4d SHA-256: 8210bf431bdc64f261309c02dc13b10147250e81426ea6adf5f6198635ca59ba
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains embedded JavaScript and a link farm pointing to multiple external URLs, some of which are hosted on compromised WordPress sites. The embedded JavaScript likely facilitates the redirection or execution of further malicious actions, while the link farm aims to obscure the final destination and potentially spread across various domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/72854028340.pdf In PDF document text
    • http://hkalc.com/userfiles/88095775001.pdfIn PDF document text
    • http://shanghaiqingchen.com/upload/files/jekujixaxabewa.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/93810783.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/14499006026.pdfIn PDF document text
    • http://jjc-dev.com/userfiles/file/pukupifufinilufuraxomot.pdfIn PDF document text
    • http://baominhlabors.com/upload/files/tesifelexaneridut.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/62679951676.pdfIn PDF document text
    • http://almawred-sy.com/files/adminfiles/files/beburataw.pdfIn PDF document text
    • http://www.kocay.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16139d2f8611f9---wusikibogumazodibur.pdfIn PDF document text
    • http://nationshield.ae/userfiles/files/59545923514.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/wasujikasozigixeluwe.pdfIn PDF document text
    • http://uniondeautoescuelas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137b36bb14ad---notixi.pdfIn PDF document text
    • https://hoangnhataudio.vn/media/files/30667052248.pdfIn PDF document text
    • http://dotykbylinky.sk/_subory/subory/95884543931.pdfIn PDF document text
    • https://hopclickhospitality.com/scgtest/team-explore/uploads/files/judumufivodabipuwepupo.pdfIn PDF document text
    • http://pn-tech.net/userData/board/file/zetarepetanoderugeguri.pdfIn PDF document text
    • https://endeligmandag.no/e-brev/data/div/sarotiz.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/vfed0iuerq0etervhgdacvk247/6277131036.pdfIn PDF document text
    • https://tonmathunglan.vn/upload/files/88502125186.pdfIn PDF document text
    • http://aviapartner.biz/js/ckfinder/userfiles/files/judosilaroninonisu.pdfIn PDF document text
    • https://chambres-hotes-aube-bleue.fr/userfiles/file/45255210340.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/ngfLrbzwjls/uplcv?utm_term=artistic+medium+meaningPDF 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_off000106e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E4 10628 bytes
SHA-256: 276d002bb20317ea119852c42a8d671a536a4fa0ec5e2270abed69a40f508896
font_01_sfnt_off00011f04.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F04 17420 bytes
SHA-256: 0e80475b3ff015e1150d79143e2aa13e6f983b53e8829f58941bf321607cde11
font_02_sfnt_off00014b41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14B41 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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