Malicious PDF — malware analysis report

Static analysis result for SHA-256 6783ae3f80dd25f1…

MALICIOUS

PDF

73.1 KB Created: 2021-09-07 05:46:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 64c8997665501f12595db467016c5deb SHA-1: b1bd8ac251e382538b2a02c89b7497c1146e9b8f SHA-256: 6783ae3f80dd25f167bccaa3727bac7fde3c54477a21dd19d839628814d9335e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by a machine learning classifier and ClamAV, indicating a high likelihood of malicious intent. The document contains numerous links pointing to external websites, many of which appear to be compromised or disposable hosting, suggesting a link farm or phishing lure. The presence of PDF_URI and PDF_SEO_DISPOSABLE_LINK_FARM heuristics further supports this, indicating the document's primary function is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=introduction+to+academic+writing+alice+oshima+ann+hogue+pdf PDF link annotation
    • http://mcdanielz.eu/files/file/97273391522.pdfIn PDF document text
    • https://dichvuketoanvn.org/uploads/files/55111801428.pdfIn PDF document text
    • http://mnarch.it/userfiles/files/tedifo.pdfIn PDF document text
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/f806a5d728295048a61e23a2e3a79702/41936630990.pdfIn PDF document text
    • http://mattstergamer.com/wp-content/plugins/super-forms/uploads/php/files/848rp92f1m9mssq2b9k1qs337l/tuzuditujefemopavebor.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160e651ad8ebe6---27055531389.pdfIn PDF document text
    • https://observatoire-omic.org/documents/file/xasun.pdfIn PDF document text
    • https://baohohoanglong.com/userfiles/file/wanixuj.pdfIn PDF document text
    • https://ahirealty.in/admin/userfiles/files/nejudagulino.pdfIn PDF document text
    • http://df-2.de/images/daten/file/kelubixes.pdfIn PDF document text
    • https://rubin2000-distribuitorshop.ro/userfiles/file/76974515128.pdfIn PDF document text
    • https://www.blackandwhite-salon.com/wp-content/plugins/super-forms/uploads/php/files/tmp/pobuvuginudagojexipefaji.pdfIn PDF document text
    • https://journeypeople.cc/wp-content/plugins/super-forms/uploads/php/files/3db45d474d77544f799c68334a37db89/21060879122.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/165kc7mpr3lku43mkfsa6dfas6/jemamurewofebimojegak.pdfIn PDF document text
    • https://www.lightingsolutionsal.com/wp-content/plugins/super-forms/uploads/php/files/f1b0808679a9ccb2d4744d7982999da0/53639329628.pdfIn PDF document text
    • http://ayurveda-shiatsu-nice.com/upload/files/zisebalizo.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/7d23ea84da809c9e0771b19d44c03cf5/sukulozonokavosawe.pdfIn PDF document text
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16120e739828f3---15959504805.pdfIn PDF document text
    • http://wjcopy.com/upload/files/ximafu.pdfIn PDF document text
    • http://szzxwx.com/Upload/Upload/file/20217191349166805.pdfIn PDF document text
    • https://asesoriagade.com/app/webroot/files/files/55487197130.pdfIn PDF document text
    • http://glamour-nsk.ru/ckfinder/userfiles/files/80646870587.pdfIn PDF document text
    • http://www.garriagricola.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8a7d3550d8---nezelikujotegizezu.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_off0000bb3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB3D 16040 bytes
SHA-256: 5618745b557a63cdd1709777346e6ed9e035155ad164777884b3c897476c9e97
font_01_sfnt_off0000e44a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE44A 11204 bytes
SHA-256: bcbc5ddd2bf035e01857fc357195119a953014e3f08f0defa11a2ef9ab178bc6
font_02_sfnt_off0000fe2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE2D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.