Malicious PDF — malware analysis report

Static analysis result for SHA-256 84f772f0469161e5…

MALICIOUS

PDF

80.1 KB Created: 2021-09-07 16:07:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: f740733c9328942d9ba746195fe37fdb SHA-1: 343822360d7eb08bedbc97c404ff031b310b2307 SHA-256: 84f772f0469161e5b504a0091fbc872fb7191647f376b21846ca305089fee169
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous links to external websites, many hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM heuristics further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

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.
  • 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://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ca55a65972a---worabu.pdf In PDF document text
    • https://daaeportrett.no/upload/file/wuxupexejalutoxazakupetij.pdfIn PDF document text
    • https://spaslask.pl/wp-content/plugins/super-forms/uploads/php/files/juiv295tg72vn8h1rg1tsgqm21/82586654401.pdfIn PDF document text
    • http://ankurgroups.com/userfiles/file/povelevimoxuxupukevuxasej.pdfIn PDF document text
    • https://tecnibat.net/uploads/archivos/laketanunesijefuxopuk.pdfIn PDF document text
    • http://hi-reid-solutions.com/wp-content/plugins/super-forms/uploads/php/files/6e503fdbc440d23d14a14a23be4232d7/1466874622.pdfIn PDF document text
    • http://greathorserider.com/ckfinder/userfiles/files/dukuguliluboxenakud.pdfIn PDF document text
    • http://yngc.ru/admin/ckfinder/userfiles/files/nepuzufale.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/94614331173.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/33528979358.pdfIn PDF document text
    • http://shijijiaming.net/filespath/files/20210810094200.pdfIn PDF document text
    • http://abwrichmond.com/uploads/files/63096966273.pdfIn PDF document text
    • http://bhk-aindling.de/userfiles/files/17022281979.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/54885799302.pdfIn PDF document text
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160741e5e72738---kitobora.pdfIn PDF document text
    • http://www.scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/newotojofirad.pdfIn PDF document text
    • https://www.sidertest.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bfc24b6c033---26518546580.pdfIn PDF document text
    • http://ourhkg.com/UPFILE/userfiles/files/dororisufejizogofova.pdfIn PDF document text
    • http://caryhigh1987.com/clients/41333/File/maxadobijekowen.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/fubopagunovugilenox.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16093b8115de91---juguxutopujupafuv.pdfIn PDF document text
    • http://gmkms.net/upfile_editor/2021/files/24357769230.pdfIn PDF document text
    • https://burragebrothers.com/demo/jolie/beta/userfiles/files/dumokofukivubutinobiloto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=cara+merubah+pdf+ke+jpg+gratisPDF 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_off0000d50e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD50E 11168 bytes
SHA-256: 58a3f6ffe9c696cba3358ed56ac3d5ee18d9bb79e9acae2f89409b5514392d1c
font_01_sfnt_off0000eeb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB6 16984 bytes
SHA-256: dcbdd05918dc4ff7667a09394bb543b62359fd67856ce8324f334360466ce7a9
font_02_sfnt_off00011ac8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1