Malicious PDF — malware analysis report

Static analysis result for SHA-256 afe16b87b6ef1120…

MALICIOUS

PDF

103.3 KB Created: 2021-08-07 15:41:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 61a2466a03f53436926ae5033dd44b49 SHA-1: f037afd31570c1d752a2ac0802ee96a8ec50bc7b SHA-256: afe16b87b6ef11208bb71fd3f46a7eab990691515aaae78c80728d805d5bab76
156 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to multiple compromised CMS upload URLs. These URLs likely host further malicious content or phishing pages, aiming to deceive the user into downloading a payload or revealing sensitive information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9532

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://amenagementsoleil.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c40dbad9f20---50896414152.pdf In PDF document text
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/oau2ejnnooe6t011c483godehf/puvotabuxofurologuxuzas.pdfIn PDF document text
    • https://flyags.com/editorResources/file///zaxuvolexefuwidatawemavu.pdfIn PDF document text
    • http://graphicon.hu/wp-content/plugins/formcraft/file-upload/server/content/files/1608d8b6710b14---34899567879.pdfIn PDF document text
    • https://protradingindia.net/userfiles/file/vimexolotajeg.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/8pmunss6nlpp8jk52hnm20mea6/30965160865.pdfIn PDF document text
    • http://h-st.nl/bestanden/files/18661371882.pdfIn PDF document text
    • http://lafayetteconnections.com/clients/52818/File/gigozolokuwosijuvixebuvi.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/rulelesavebefipud.pdfIn PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/7469773942.pdfIn PDF document text
    • https://beaufortbond.com/wp-content/plugins/super-forms/uploads/php/files/f6b33f3c5eb590e8742d3de2d81b63f8/vigake.pdfIn PDF document text
    • http://vncdata.net/app/webroot/uploads/files/zeniroxaruvuluvo.pdfIn PDF document text
    • https://www.sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607e62a7c8cd6---wilatelenuxotim.pdfIn PDF document text
    • https://thaiwoodengames.com/files/upload/files/rodomonavago.pdfIn PDF document text
    • http://amtusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c2cefb27e7d---vofajosanizigibosuva.pdfIn PDF document text
    • http://frankslawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/midikojuz.pdfIn PDF document text
    • http://www.specemc.ru/upload/files/najapidavafuv.pdfIn PDF document text
    • http://escqatar.com/uploads/userfiles/file/file/23750803647.pdfIn PDF document text
    • https://teplitsyoptom.ru/wp-content/plugins/super-forms/uploads/php/files/2ddc6b3bb456da934162bd1fb7a388ae/96351919659.pdfIn PDF document text
    • https://www.ciabrini-immobilier.com/wp-content/plugins/super-forms/uploads/php/files/d069jfgoofjscr8makuef9cbu4/1494997244.pdfIn PDF document text
    • http://avtoarka.ru/wp-content/plugins/super-forms/uploads/php/files/b92cc3037141e7d840a2e49850b0c6e3/87652701758.pdfIn PDF document text
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160c02e684a091---vokudevano.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/dl992ei1kvj25gidijq0nt05gn/67943117486.pdfIn PDF document text
    • http://www.jimenez-casquet.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b242e20e6ec---74025230777.pdfIn PDF document text
    • http://brnc85.com/clients/878796/File/muzeduked.pdfIn PDF document text
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160ec42ba2e245---88310513293.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=how+to+calculate+sss+trianglePDF 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_off000116b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B6 10584 bytes
SHA-256: f3b104fc74a3f5983a2353f160003fe559d19a2d66f350242fe8b417c517a912
font_01_sfnt_off00012f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F0C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001471d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1471D 16092 bytes
SHA-256: 9d5144547e0b729630886a3ad3ce48e7da84b0115899dd9c2390406af6f0fecd
font_03_sfnt_off00015c5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15C5E 17888 bytes
SHA-256: b7c8432aa45dc1f3c498b2dc867c2be646ee787ab3c5a88a86f9e50b7bfc471c