Malicious PDF — malware analysis report

Static analysis result for SHA-256 55be7b95e3091713…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 02:46:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a2c4b16e3adb614777c131e5c473a8f4 SHA-1: 5dc02482baff7bc14bdfea9ed207d6a87d09deb7 SHA-256: 55be7b95e3091713860df175371918349a50732845813200c9c2cdc34bae6452
204 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm and employs a 'password-protected archive' lure, suggesting it's designed to trick users into downloading an encrypted payload. The presence of multiple external URLs, some hosted on compromised CMS platforms, further supports a malicious intent to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 https://cructi.ru/uplcv?utm_term=how+to+disable+screen+lock+on+android PDF link annotation
    • http://georgewongdesign.com/gwd/upload/files/94894585474.pdfIn PDF document text
    • http://penzion-u-zamku.cz/files/file/janajag.pdfIn PDF document text
    • https://callmarkinvestments.com/callmark/files/44243563832.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/161443d02c16a5---65599258185.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/99941646589.pdfIn PDF document text
    • http://taigesw.com/upload/files/supufusuwafimopefok.pdfIn PDF document text
    • http://notariocprietoa.com/notaria/documentos/files/9566603964.pdfIn PDF document text
    • http://elmiraclassiccountry.com/wp-content/plugins/super-forms/uploads/php/files/cda52fd8e6ba01bddfc3da49d9a1862a/wonugureregolazapufaxaf.pdfIn PDF document text
    • http://www.lovebliss.tw/UserFiles/files/fuzar.pdfIn PDF document text
    • https://myphi.biz/nbloom/fckuploads/file/lujiz.pdfIn PDF document text
    • https://landtop.com/filespath/files/20210913214827.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b48663a4df---70568730417.pdfIn PDF document text
    • http://puisan.ru/uploads/file/43044798511.pdfIn PDF document text
    • http://telektrans.hu/editor_up/bobidizugowimenojitopu.pdfIn PDF document text
    • http://eamenfaraz.com/cache/fck_files/file/sepusegefobabupomegebe.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/10356059164.pdfIn PDF document text
    • http://videlec.be/ressource/file/96992702864.pdfIn PDF document text
    • http://women-for-marriage.com/ckfinder/userfiles/files/jisatupudidekobaju.pdfIn PDF document text
    • http://madinagirls.com/easydo%20v2.00/files/uploads/janutipademipeg.pdfIn PDF document text
    • https://buildingexpertsdirectory.com/ckfinder/userfiles/files/wifubuzoluwisubon.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/punenikowafugutiwapa.pdfIn PDF document text
    • https://suemsas.com/wp-content/plugins/super-forms/uploads/php/files/dqoiseuhgmk8u3pvksjn292192/tapevawuvojomewiwopup.pdfIn PDF document text
    • https://www.chauffeur-prive-nice.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614525ac7acf8---turakikipake.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_off0000e4c6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C6 10672 bytes
SHA-256: dd7c61f02b2ca4163013f5ec377804ea804b47ea7a0abb5b2898195d8dbffbb8
font_01_sfnt_off0000fd5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD5E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011570.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11570 18196 bytes
SHA-256: d3895133167e88ecf0d63410d0eddb2cb36e02b84965842e829f8218894837f0

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