Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b685f6d569a4247…

MALICIOUS

PDF

116.9 KB Created: 2021-06-12 17:28:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 338e07c3556cd8b54279de8729519427 SHA-1: 14bf51654fdf22236859e3c7ee8ec516d9ee2cc3 SHA-256: 7b685f6d569a4247a21568e01b21503e4059fe0fcea06a1fbef21632e91776b3
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The 'SE_CLICKFIX' heuristic indicates the document likely attempts to trick the user into executing a command by instructing them to press Win+R or paste a command, a common social engineering tactic to bypass macro restrictions. The numerous embedded URLs suggest a link farm designed to redirect users to malicious sites or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://krisoc.ru/uplcv?utm_term=data+frame+r+cheat+sheet PDF link annotation
    • https://promocionesnma.com/wp-content/plugins/super-forms/uploads/php/files/0531973932bdc0e9ca0bd6655f8f0531/beruda.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b46080005cd---86313591065.pdfIn PDF document text
    • http://alexanderkanevskyartgallery.com/clientMedia/file/rozeme.pdfIn PDF document text
    • http://www.scmphotography.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0964d3190---8002189466.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af975c5b923---36754955680.pdfIn PDF document text
    • https://realestateconnect.pro/wp-content/plugins/super-forms/uploads/php/files/nu2scnuetou7lc300aolp96hj5/denimupovonitarasikedekud.pdfIn PDF document text
    • http://abc-tel.ru/data/File/zesovezamixazuji.pdfIn PDF document text
    • http://kindervakantieweekdeurne.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1607b7b417e2b7---bizarijivazosas.pdfIn PDF document text
    • https://www.alphaveneers.com/wp-content/plugins/super-forms/uploads/php/files/4e45945c64f0e648fa98a392e30a867b/zusixidom.pdfIn PDF document text
    • https://alihuata.com/userfiles/file/11972219830.pdfIn PDF document text
    • https://centar-znr-zop.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1606c909bc6e65---koruvunenaru.pdfIn PDF document text
    • http://au-coeur-du-temps.com/userfiles/file/56112780041.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/okcm95t313ik6qfliafgoim1f1/xezepixofa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018e77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18E77 5088 bytes
SHA-256: 79a24b69e73ce4ea9ba332e4e69a30b44a1cb4291cd038d0099af89842fd0c99
font_01_sfnt_off00019fa7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19FA7 11348 bytes
SHA-256: 7027bcb3abf87e5a9bac34ff931da57b40190ee02e666954cac78864ce7eebd3