Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9752aef5c6542d5…

MALICIOUS

PDF

98.9 KB Created: 2021-08-10 17:37:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c3cfdf83edfd0aac355364eac6feccdf SHA-1: 8ab48024f9e14988cf3017ab5bb3ed0c17b4dc43 SHA-256: a9752aef5c6542d5ebb90b8a294daf9e4b52c737faa71e1cdb80bce344f1b870
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, with numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting. These links likely lead to further malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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 https://crysiq.ru/uplcv?utm_term=how+does+a+prenup+work+in+canada PDF link annotation
    • http://keacg.com/upload/files/93952918177.pdfIn PDF document text
    • http://logtech.cz/foto/Image/file/lakax.pdfIn PDF document text
    • https://smarttactic.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a61fe61456d---95066315316.pdfIn PDF document text
    • https://xn----7sbabak5acz7byau.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/65a7acd2b0afc070d06c176a73e9b5f6/10812789812.pdfIn PDF document text
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb69777f2d6---jedolodurifi.pdfIn PDF document text
    • https://dispomydeal.com/wp-content/plugins/super-forms/uploads/php/files/38f28038824960a7b917b42b94b43116/89863713460.pdfIn PDF document text
    • https://bdsvieclam.com/upload/files/metalavuvodezemip.pdfIn PDF document text
    • https://htfcompact.com/wp-content/plugins/super-forms/uploads/php/files/8e0b38aa5786d10aa892799354688fb3/64342914348.pdfIn PDF document text
    • http://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1608f729aa9af1---buxajiwuw.pdfIn PDF document text
    • http://chukysovin.com/img-svc/files/foropinujikoladagesolel.pdfIn PDF document text
    • http://dochoiotovn.com/uploads/userfiles/file/41025981086.pdfIn PDF document text
    • https://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/160d57605a13d9---bixujilokeredizanitotemow.pdfIn PDF document text
    • http://akgikorea.com/file_upload/fck_upfile/file/7968877862.pdfIn PDF document text
    • http://trenermichal.pl/wp-content/plugins/formcraft/file-upload/server/content/files/16096d07be5963---xejelojodunat.pdfIn PDF document text
    • https://noihoithanhtuan.com/media/ftp/file/67908428007.pdfIn PDF document text
    • http://wildpflanzen-planung.de/file/zeribowozil.pdfIn PDF document text
    • https://g-ortho.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f314c8cc26---fokuvuwukuzakubute.pdfIn PDF document text
    • https://leo.tw/upload/ckeditor/files/wuwenemumedukivebikudum.pdfIn PDF document text
    • https://hoalavender.net/upload/files/pibumebivub.pdfIn PDF document text
    • http://theopenhouseclub.com/wp-content/plugins/super-forms/uploads/php/files/4f015aa36fee635e4f42b62e2122a55c/22467335690.pdfIn PDF document text
    • http://monroehighwildcats.com/clients/40160/File/17558301521.pdfIn PDF document text
    • http://mirembeestate.co.ug/wp-content/plugins/formcraft/file-upload/server/content/files/16087d9b0c43e1---rerawejojovateb.pdfIn PDF document text
    • https://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/427316c1ee102810e2e38b9016a2d275/retemanumatubeju.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160849dbbcec4f---xiwudinemufi.pdfIn PDF document text
    • http://aquarium-kochi.com/app/webroot/ckfinder/userfiles/files/12499751290.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_off00011d0f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D0F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00013526.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13526 10632 bytes
SHA-256: a0441f57e3dc356324757bc111b0c3febf2bc2916ec76aa4998c708aa03409f0
font_02_sfnt_off00014d99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14D99 17980 bytes
SHA-256: 36e0529f82a068311029097607c3d3843c6cc57e055146847cf17ec7b5bc1fd4