Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5899e08a6454da8…

MALICIOUS

PDF

87.7 KB Created: 2021-08-09 10:52:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 4cef2b88a92dbf9eff572b02372066fc SHA-1: de7105ace02b20de4973ed46a5aa1832805731f8 SHA-256: d5899e08a6454da8ed70d35b6610ad0141fc7840cb80a6fac42f0d63570c3711
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier indicating a high probability of maliciousness. The file functions as a link farm, directing users to numerous external URLs, many of which are hosted on compromised WordPress sites or disposable domains. The presence of these links suggests an attempt to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://kes-stv.ru/wp-content/plugins/super-forms/uploads/php/files/38eb6ad625ca9f506f746e4ae9824332/51898673335.pdf In PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/36c03b3b9c557490ec82cd26e4cad3b2/gulivupazoviwolamiv.pdfIn PDF document text
    • https://artenika.pl/fck/file/76877668545.pdfIn PDF document text
    • http://bmsorganica.com/userfiles/file/selefagafuwegabowexexig.pdfIn PDF document text
    • https://al-farh-iq.com/upload/userfiles/file/54905022703.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160817e8b0cb70---39828669170.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/45834112168.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/ea88f1283c3aabdc51928350e77898d9/busedazeti.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/b5d14c7b8384c5eb4edb8a4fc5b26f2a/55342326632.pdfIn PDF document text
    • https://cmfnepal.org/userfiles/files/veloxetama.pdfIn PDF document text
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/fv4u411bqkjaqppjupk9k1un20/xupipudakuz.pdfIn PDF document text
    • http://taxicityplus.ru/userfiles/file/68918540716.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/rajijukokelofulowovidew.pdfIn PDF document text
    • http://andlupa.com/userfiles/file/lusemapodukurelefak.pdfIn PDF document text
    • http://keyflounge.nl/userfiles/file/87878818601.pdfIn PDF document text
    • https://www.siemers-deutschmann.de/wp-content/plugins/super-forms/uploads/php/files/kg72esolp2ebnvfpsd5i0ll531/21045842953.pdfIn PDF document text
    • https://audreyheselmans.com/_files/file/48519902486.pdfIn PDF document text
    • https://designclarf.it/file/furulabogutozo.pdfIn PDF document text
    • https://www.americansummercamps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160834b085857b---witemuvag.pdfIn PDF document text
    • http://pantanalmsnews.com.br/ckfinder/userfiles/files/bimaxiropisuxixoguni.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/kotironagu.pdfIn PDF document text
    • https://247hvac.ca/fabulous1/uploads/files/ragewesusakepomilakite.pdfIn PDF document text
    • https://adepotcustom.com/UploadFiles/file/20210516183508188.pdfIn PDF document text
    • https://marjoyunlar.com/calisma2/files/uploads/36773781782.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=gatehouse+electronic+keypad+deadbolt+manualPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d67e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67E 16892 bytes
SHA-256: 5400251fc6ed28dfcf84823effc7b556d4310f9cfa99dd1cc8060ba7595e01ca
font_01_sfnt_off000102cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102CC 11264 bytes
SHA-256: 692f44637c69ed8396284fc5771b07dc6cd192a1209b5aa4807315621f0512b8
font_02_sfnt_off00011ce1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CE1 17624 bytes
SHA-256: acbb6b66b6d5c5a7917f9136b823b58523ee0c0ea258edb621e0a2231b5dc880
font_03_sfnt_off000137f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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