Malicious PDF — malware analysis report

Static analysis result for SHA-256 13d11152ab04e6f9…

MALICIOUS

PDF

78.7 KB Created: 2021-09-15 18:36:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: d395efb03616e41fbc1f882b77a5cb9e SHA-1: 44ad2408e81ecce345396ab35b171053586b7d54 SHA-256: 13d11152ab04e6f9b7edba9321173a5da809fc25b3949dfd0f1396493ab52916
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The document contains embedded JavaScript and numerous external URIs, many of which point to compromised or disposable hosting, suggesting it functions as a link farm. The embedded JavaScript likely facilitates the redirection to these malicious sites, potentially for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://munnarinfo.in/userfiles/file/pesebotofagaxukovovupexox.pdf In PDF document text
    • http://ingatlanfelugyelet.hu/uploads/file/53435666078.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/79930218196.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/64598577607.pdfIn PDF document text
    • https://divanich96.ru/admin/ckfinder/userfiles/files/3552715998.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/84115784377.pdfIn PDF document text
    • http://taihegas.com/filespath/files/20210914005918.pdfIn PDF document text
    • https://yar-net.ru/userfiles/file/tifuraraledopelobafuronej.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/2021912174218081.pdfIn PDF document text
    • https://cosmeticdermatologymiamibeach.com/uploads/data/files/13822522543.pdfIn PDF document text
    • http://hzdsbg.com/uploadfile/1630596819.pdfIn PDF document text
    • https://aimhc.com/userfiles/file/gulipanuvaxuvumavi.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/suwukuwejikut.pdfIn PDF document text
    • https://proff-doors.ru/wp-content/plugins/super-forms/uploads/php/files/065d00c1c5f1f5c918c85b67ae18ff6d/bixekinalakuwomagom.pdfIn PDF document text
    • https://monarchwinemerchants.com/wp-content/plugins/super-forms/uploads/php/files/32b5729e10ddee36686bd8a8b03cf2dd/28135520055.pdfIn PDF document text
    • http://liebherr-tr.com/userfiles/file/66071635212.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dfba8b7681---pinupagilufagixovuzi.pdfIn PDF document text
    • https://anbc31.iscriptscloud.com/app/webroot/files/file/muronimij.pdfIn PDF document text
    • https://ruedi-leuthold.com/userfiles/files/fupujisuvekijumolewajil.pdfIn PDF document text
    • https://fond.ru/userfiles/file/67812383477.pdfIn PDF document text
    • https://umiyawoodworks.com/fckdb/userfiles/file/pikawejizezufigimes.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/161362bcc16023---makodibobosudiruvimitexab.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d0a71c4762---mejajixogofefotavoxed.pdfIn PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/kojijutufasixepoxan.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=gradle+new+versionPDF 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_off0000cf6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF6D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e77f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE77F 17716 bytes
SHA-256: 5b1ea0419c36ae237119dcbbc35aa363257c29ee259d258312b3d04fe4a72254
font_02_sfnt_off00011616.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11616 10336 bytes
SHA-256: 2311cb021d7314323187e10323286612d3e6bb3206cf225da98dd717a65a4c26

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