Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b8ffdadad080794…

MALICIOUS

PDF

96.7 KB Created: 2021-06-29 03:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 1c6494b5a34e251c5f7e5bff8071da6b SHA-1: 105b17e754a5c145667faa54579139dbef2dc635 SHA-256: 8b8ffdadad080794cd9dddb65b62c76c98496c7c8840541b2c4d000a893b90f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1553.004 SE_SECURITY_BYPASS

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Security Bypass' heuristic suggests the document attempts to instruct the user to disable antivirus software, a common tactic to evade detection. Multiple embedded URLs point to compromised WordPress sites, likely serving as part of a link farm or hosting malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://www.ptlittleflower.org/wp-content/plugins/super-forms/uploads/php/files/1t75bn9fiq5ehoaoefaj8cajik/josimovevajefalasep.pdf In PDF document text
    • http://www.oknookna.pl/wp-content/plugins/formcraft/file-upload/server/content/files/160b01112498d5---64526046292.pdfIn PDF document text
    • http://www.greenbriarpropmgmt.com/wp-content/plugins/super-forms/uploads/php/files/8c5eb8a7d5fe3af41f1a6d6d4f88c0ab/zokivib.pdfIn PDF document text
    • http://hilltop1976.com/clients/24685/File/37175687006.pdfIn PDF document text
    • https://chpcentre.com/files/file/68847530263.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/e6b404f87a3d2dab463e40b7cbf48d97/1976418031.pdfIn PDF document text
    • http://www.aluvascientific.com/UserFiles/file/53846288230.pdfIn PDF document text
    • http://www.driftime.ee/wp-content/plugins/formcraft/file-upload/server/content/files/160a198515e8cd---23214651772.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/16091a84fdbdc7---tipifufemepez.pdfIn PDF document text
    • https://razvozka24.ru/wp-content/plugins/super-forms/uploads/php/files/85d48d64cc7c2ba678eee3c79891ec68/37599604713.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/160910de5bf133---bopikafadupefamomod.pdfIn PDF document text
    • http://nextgt.eu/uploads/file/85118860618.pdfIn PDF document text
    • http://lezeckastenakosice.sk/upload/files/janezadaxetuli.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608e09cfeffad---35190998781.pdfIn PDF document text
    • http://podhoru.cz/userfiles/file/nivufexel.pdfIn PDF document text
    • http://moveisgarciadigital.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607191e34264b---34405248040.pdfIn PDF document text
    • https://adbadog.com/wp-content/plugins/super-forms/uploads/php/files/23c486e2db700396029f26b43ac2f612/72622275825.pdfIn PDF document text
    • http://www.mvdisposal.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c636c18b031---84874065805.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/rokujanumib.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/160c02ba9bb805---mubojovivelup.pdfIn PDF document text
    • http://trendstyleimage.com/uploads/ckfinder/userfiles/files/89409456541.pdfIn PDF document text
    • http://steclotildehorton.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a475c7559d8---5505385398.pdfIn PDF document text
    • https://shotclock.ca/wp-content/plugins/super-forms/uploads/php/files/9eedda6916995dd760a7be573e9a02ba/79257844579.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=crysis+remastered+steamPDF link annotation
    • 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_off000116b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116B1 10284 bytes
SHA-256: 807ba4da87e644954796078e8d073446a570076c6d0ec0ae72e7128b9dc40ba6
font_01_sfnt_off00012dea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DEA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145FC 17972 bytes
SHA-256: f312d50a132aabcd2ef4fae59866d3ce0545d1d796aa9de0239b58af264a6caa

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