Malicious PDF — malware analysis report

Static analysis result for SHA-256 b792f60c1c9872a1…

MALICIOUS

PDF

104.2 KB Created: 2021-09-01 07:09:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: 27f764afdc397eb182560edd2f6ae8bf SHA-1: 4414b2df708fa7c3da6d2da3fb60511fcdeaaaa5 SHA-256: b792f60c1c9872a127d02a3a4136c413967634bbaa3ef538c12f8c03a5dbefcb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://queure.ru/uplcv?utm_term=mark+minervini+think+and+trade+like+a+champion+pdf+download PDF link annotation
    • https://aawyx.com/sites/default/imageuser/file/gibeze.pdfIn PDF document text
    • http://www.maoles.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b2e9bd1ffbc---67293945041.pdfIn PDF document text
    • http://ride.hu/images/uploads/files/weralapo.pdfIn PDF document text
    • http://www.sparkprototypes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a9f684bf05b---30452769452.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/rafixuwef.pdfIn PDF document text
    • http://riggi.ru/userfiles/file/26741835749.pdfIn PDF document text
    • https://dianthusindustrial.com/resimler/files/wijijonunajotogiz.pdfIn PDF document text
    • http://woonhuislift.info/wp-content/plugins/formcraft/file-upload/server/content/files/16099de3f95677---wivomo.pdfIn PDF document text
    • http://xn--80ab1a9a.xn--p1ai/sadm_files/xoropibivanogozutu.pdfIn PDF document text
    • http://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/qla80kgihevu32u5pjv54ggdqk/8396352314.pdfIn PDF document text
    • http://www.mywil.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1609ca24aaa884---85368325789.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/c88501d421b6c5623e38d66b4f674983/tateduwebirorupe.pdfIn PDF document text
    • http://timatey.kz/wp-content/plugins/super-forms/uploads/php/files/89pp3dii3vtpal82cp72736sd3/vorejalazujokubepap.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/8103435f2c503522e6004bb117f76ed1/lojumapojiwi.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161267d00a4381---49962267164.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160fb221283642---15471819033.pdfIn PDF document text
    • https://getadoc.in/ckfinder/userfiles/files/puwugokiv.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/13100069457.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/3d1ad67ec1db7226d34e7485d16ba68f/fabubedewulemol.pdfIn PDF document text
    • https://ngoctraithaibinhduong.com/uploads/news_file/92391855853.pdfIn PDF document text
    • https://purefeeling8.com/data/file/64749927098.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_off00012dda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DDA 19700 bytes
SHA-256: a3cca4c27a9f103b657cb335faa01875a21d39da97db7bbfa0f67d00118f631f
font_01_sfnt_off000160d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x160D7 10956 bytes
SHA-256: 5238e0bb441b502820195d536390835ad122388409766bc189e8a845d969706f
font_02_sfnt_off00017a15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17A15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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