Malicious PDF — malware analysis report

Static analysis result for SHA-256 be85862ac37d196e…

MALICIOUS

PDF

82.7 KB Created: 2021-09-04 19:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 1a43fc4a74c83ef065960ad92cff9b91 SHA-1: a181c4ea8021c2220ff51270bd118bdf0d7625f4 SHA-256: be85862ac37d196e7ff29307f1ed58cca3571f796c2f5febc4f8b7c6d7fc24ba
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV. It functions as a link farm, containing numerous external URLs that likely lead to phishing sites or malware downloads. The heuristic 'PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM' indicates that some links point to compromised WordPress upload storage, suggesting a technique to host malicious content on seemingly legitimate sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://irlanc.ru/uplcv?utm_term=ejercicios+de+identidades+trigonometricas+fundamentales+pdf PDF link annotation
    • https://www.pennlighting.com/wp-content/plugins/super-forms/uploads/php/files/dcd1ba61f99e2192f2e44d5f60f644f5/10934195057.pdfIn PDF document text
    • https://beribuket.ru/wp-content/plugins/super-forms/uploads/php/files/62aa8581f8fc3c7807f956711def4b55/32505230273.pdfIn PDF document text
    • http://fipjp.com/userfiles/file/73571059462.pdfIn PDF document text
    • http://www.cddfct.com/up_files/file/tijikezavonimanimodepi.pdfIn PDF document text
    • http://slenderclub.cz/ckfinder/userfiles/files/92683661167.pdfIn PDF document text
    • https://broadstripe.com/wp-content/plugins/super-forms/uploads/php/files/b516c88ee588848e933fd27c3d4f76c0/45011490272.pdfIn PDF document text
    • https://regalcabs.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096a5ac784a4---puxujavojoganewejevivusu.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/9a0abb9931984e37d35035baf69d0c6b/mifizumumiwolisuxeju.pdfIn PDF document text
    • http://bochosushi.com/wp-content/plugins/formcraft/file-upload/server/content/files/160aaac35010dc---70819287533.pdfIn PDF document text
    • http://jiuxingchaoshi.com/uploads/file/221802235595.pdfIn PDF document text
    • https://buddingheights.org/wp-content/plugins/formcraft/file-upload/server/content/files/1610c4dcd88506---4347611118.pdfIn PDF document text
    • https://novahealthclinic.ca/userfiles/file/52406665327.pdfIn PDF document text
    • http://idaskitchen.org/clients/d/d8/d86ca706a5600d452cde81e4a21b2d68/File/12326846800.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/09ea7245096fc6a3de0d462c7cd32501/70362741611.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160c4bc0f3548d---xanozavazetopaledabe.pdfIn PDF document text
    • http://home-delighted.com/user_img/files/lawufemavu.pdfIn PDF document text
    • http://www.vnos.vn/app/webroot/uploads/files/sobapopepukivole.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/t39hmhdb579u0ettcpadertina/jegedevagimukizuwis.pdfIn PDF document text
    • http://degrossier.nl/uploads/file/70312729081.pdfIn PDF document text
    • http://abogadosaguilar.com/ckfinder/userfiles/files/1450978418.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607caf8f0e797---gawam.pdfIn PDF document text
    • http://www.reenactmentmarket.eu/images/wyswig_images/file/88998713139.pdfIn PDF document text
    • http://yfatc.com/userfiles/file/bakowuvosorolaterudigawo.pdfIn PDF document text
    • https://saintarseny.ca/sites/saintarseny.ca/files/file/42294945652.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/xivekekifejuxigasod.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160dfb8ff37424---16863282560.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_off0000db47.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB47 18388 bytes
SHA-256: 5d53df18a9f75c03d2a1245a8643f0b0efcd6665ab944266e3fb12457dad22cc
font_01_sfnt_off00010a5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A5D 11176 bytes
SHA-256: 37ed629f78cfab05548aa95db01c7fce464b5711c278a1fc4f32ac2a45b5b5b8
font_02_sfnt_off00012442.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12442 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1