Malicious PDF — malware analysis report

Static analysis result for SHA-256 86dd1c1195518e29…

MALICIOUS

PDF

89.5 KB Created: 2021-07-18 19:56:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: 640e8a86c50203378dd1d33dbccefe18 SHA-1: 0cab50cc3d013a954d0d8ceb15cdb22618af3551 SHA-256: 86dd1c1195518e2930aee06b20e8d1cbcd04bc3e15a558e8272acafa654fc0c9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of links, many pointing to compromised WordPress sites, indicating a link farm designed to host or redirect to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were directly extracted, the structure and URL patterns are consistent with a malicious PDF designed to lure users to external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

Heuristics 6

  • 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.
  • 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://pavcargo.ru/wp-content/plugins/super-forms/uploads/php/files/d5929dc32bacfff0dd506ee51e95a52f/13743319922.pdf In PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16075099a0fde7---36910276593.pdfIn PDF document text
    • https://www.straightmyteeth.eu/wp-content/plugins/super-forms/uploads/php/files/7008b45d93b1fb03df0775dd3341d920/vewawipemaxikokimeruduju.pdfIn PDF document text
    • http://studiogallerani.it/userfiles/files/muludekuripotivov.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e05057e000a---66624751885.pdfIn PDF document text
    • https://olympicwroclaw.pl/zdjecia/fck/file/25966058706.pdfIn PDF document text
    • http://sjar-tech.com/uploadfile/file///2021061610502257.pdfIn PDF document text
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/e436qqprq8m1b8ngbglpvic99d/50283592575.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/gexiparepigezigutet.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/29061824702.pdfIn PDF document text
    • http://hanlacsclub.com/ckupload/files/bewowiri.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/69380134200.pdfIn PDF document text
    • http://dmhfamilyreunion.com/clients/4/44/44eff64e497b984d8b2945277059c9c0/File/jupusotedanifurulinokode.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/87502977820.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f152f7b4b9---gobunin.pdfIn PDF document text
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4508f3b819---xosasizukubik.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/14595017551.pdfIn PDF document text
    • https://nowbali.co.id/wp-content/plugins/formcraft/file-upload/server/content/files/1606cb42a0f591---fosifurasovopapif.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/begowiwomedolikosunegup.pdfIn PDF document text
    • https://teenvolunteerhouston.com/wp-content/plugins/super-forms/uploads/php/files/60c8f45cc2c9c6ea29bcb30a1a61a017/nozilixivixarajimijiram.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/q46c2e1juo12apltd3jq778c0q/36405213571.pdfIn PDF document text
    • https://www.andeanskyline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad276fcb5da---77574887395.pdfIn PDF document text
    • https://www.darrellstuckey.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fb953c9861---1385351565.pdfIn PDF document text
    • https://www.acptechnologies.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f1119d0185---68466086857.pdfIn PDF document text
    • http://srsheicha.com/uploadfile/file/60353949479.pdfIn PDF document text
    • http://watch62.ru/files/files/29013685564.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=correct+order+of+underworld+moviesPDF 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_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 10760 bytes
SHA-256: 22118dc3a8d8d4b15b930873ee341c2493306a0265eac9fa71adb35ae4f1c09d
font_01_sfnt_off000112e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112E7 17540 bytes
SHA-256: f1b7c171d1ab6bf19b9f0e6d7ff3290f8cb6903cb773e7889a8001f2e680b885
font_02_sfnt_off00014052.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14052 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1