Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc3560bdb9d88f8e…

MALICIOUS

PDF

75.8 KB Created: 2021-09-19 20:10:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: fe5609f99e3e46fc4f1067896ffb396d SHA-1: a13dec4817ea055e02f7776baf12ac167a2fae8e SHA-256: cc3560bdb9d88f8e5c0b02c0a6ad60e1132c5675ed5df29c6caafe197355fe9d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm hosted on potentially compromised or disposable domains, designed to trick users into clicking through to malicious content. While no scripts were directly extracted, the nature of link farms and the 'download button' heuristic suggest an intent to facilitate the download of further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://zatexpress.com/upload/userfiles/files/74434427362.pdf In PDF document text
    • http://abpaluso.com/upload/file/zuxaraxutenokes.pdfIn PDF document text
    • http://zoldjogsi.hu/uploads/files/48923720660.pdfIn PDF document text
    • https://betenenergy.com/sites/default/files/file/gikeguvaloweguzeviwudos.pdfIn PDF document text
    • http://maivietnamesecotati.com/uploads/files/76703607558.pdfIn PDF document text
    • http://doremimarlikinsaat.com/userfiles/file/18848272139.pdfIn PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143add271442---joduxigijuvene.pdfIn PDF document text
    • http://iswii.net/ckfinder/userfiles/files/87726362743.pdfIn PDF document text
    • https://f2h63c2.ip4secure.net/upload/files/59154668409.pdfIn PDF document text
    • http://braciszewska-klimek.pl/fck_files/file/wetakefutepowop.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613062cdcbfed---xutipaxufutamejokap.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/16685105610.pdfIn PDF document text
    • https://www.prshots.com/ckfinder/userfiles/files/31803217688.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/16134d06b49274---50175012489.pdfIn PDF document text
    • http://reliancefla.com/admin/images/file/forujajusekeromogageme.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/vibojikewofikagewu.pdfIn PDF document text
    • https://mimpishio2.net/contents/files/46675846624.pdfIn PDF document text
    • http://www.teeintact.com/admin/fckeditor/editor/filemanager/connectors/php/img/file/mizifoketalusuvagidefono.pdfIn PDF document text
    • http://adice-area.com/pictures/files/36630954065.pdfIn PDF document text
    • https://insights3.com/wp-content/plugins/super-forms/uploads/php/files/fae88b43f1c77a0dd702d0364d49d4d3/36212663224.pdfIn PDF document text
    • http://texinpack.com/uploadfile/file///2021091507313278.pdfIn PDF document text
    • https://alamansyria.com/userfiles/file/57341719300.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=monitor+data+usage+on+androidPDF 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_off0000c5c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ddd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD3 17468 bytes
SHA-256: bf6e445327d4b853774a6cdddcec806f06fa607cb06e693903d441deb1c3bead
font_02_sfnt_off00010a6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A6D 10472 bytes
SHA-256: 5caf061f86f87ef2b9dd6e9315cba1afebe0e5043d68892eee62fc0c2ebc50e3

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