Malicious PDF — malware analysis report

Static analysis result for SHA-256 05721dc98622698b…

MALICIOUS

PDF

88.2 KB Created: 2021-07-31 19:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 53e1f98d9d62e999d0c12ce1a2e3b4e7 SHA-1: 1d73110b628fb20fa5aef086bde7fc2b4b41cd41 SHA-256: 05721dc98622698be88b2001ccd3cd6e8c824a0c9280d12d50c95277471e7e59
204 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9987

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://jrpst.pl/userfiles/file/ranot.pdf In PDF document text
    • http://technocom.pl/editor/file/siwutoxuzer.pdfIn PDF document text
    • https://sport-jicin.cz/dokumenty/guvovukivuvujabofubo.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/zubuliliparurimotujomebep.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/jikodeluxefojajog.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/gukuwesepikemujuxis.pdfIn PDF document text
    • http://cancunday.com/travela/img/files/89821709215.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/63e6ad2abaacd9b8cabe855b075304e9/41593309807.pdfIn PDF document text
    • http://thedreams.cz/files/76903705709.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/gko760h7rtil6l4ac2lp72no06/vetibe.pdfIn PDF document text
    • http://thecoferfamily.com/clients/7/78/7892d776c92a08c80f86ebc6236678d2/File/18927023727.pdfIn PDF document text
    • https://n95america.com/wp-content/plugins/super-forms/uploads/php/files/b63801aca0fa409efea944b732600ea4/18834589613.pdfIn PDF document text
    • http://alpanelektrik.com/depo/sayfaresim/file/rowolofurafogakekopesof.pdfIn PDF document text
    • http://thegioituigiay.net/uploads/files/koferul.pdfIn PDF document text
    • https://acrgroup.nl/userfiles/file/8918095294.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/fbebc34ea554489248b3b8a23155761c/45045285464.pdfIn PDF document text
    • https://www.drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160cf0ba6222f9---71028662677.pdfIn PDF document text
    • https://www.gurkhasfinance.com.np/ckfinder/userfiles/files/41760519582.pdfIn PDF document text
    • https://arizonalightingsales.com/wp-content/plugins/super-forms/uploads/php/files/3bce77765a981a55c238193a1d8f4eb4/tibazedam.pdfIn PDF document text
    • https://dagvandearchitectuur.be/_files/file/75372055459.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b7e40f66dca---79073206050.pdfIn PDF document text
    • https://mimpishio1bet.net/contents//files/nawogibewogi.pdfIn PDF document text
    • https://mehreganimaging.com/images/upload/files/11161331002.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=review+of+surgery+for+absite+and+boards+2e+pdf+free+downloadPDF 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_off0000f078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF078 18208 bytes
SHA-256: 7bd3dbe0cf38feafb1138859e00faf31adcf6f0136f4889be1d4cda74a1a32d4
font_01_sfnt_off00011f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001377a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1377A 11344 bytes
SHA-256: c5cae7c6638bc79fc14f95e2340139f2e1c9bcb64481a5188bee94a94427735b

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