Malicious PDF — malware analysis report

Static analysis result for SHA-256 afb4fdd8ed91811f…

MALICIOUS

PDF

83.1 KB Created: 2021-06-11 10:54:37 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: a762cbb2890dbb5b5809f98c5603d3a2 SHA-1: 72b1294ea3aebc6a58998e156c3b900b3a9b9e14 SHA-256: afb4fdd8ed91811f02aff361db37b176182392305563eaa85c7bce1e87149a7a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document is classified as malicious by ML models and ClamAV, indicating a phishing and potential trojan threat. It functions as a link farm, directing users to compromised WordPress upload directories and other disposable hosting sites under the guise of offering a 'free gift code'. The embedded URLs suggest an attempt to redirect users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crysiq.ru/uplcv?utm_term=goddess+primal+chaos+gift+code+free PDF link annotation
    • http://uniroll.pl/user_images/file/tewulupatizuvisowelado.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b224fb2396c---serapivolesapafovip.pdfIn PDF document text
    • https://www.simplythebestevents.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608196c0b8f38---95532296607.pdfIn PDF document text
    • https://www.denisonlandscaping.com/wp-content/plugins/formcraft/file-upload/server/content/files/16075e1ed57664---51236897878.pdfIn PDF document text
    • https://hgb.se/filer/file/mofip.pdfIn PDF document text
    • http://train-in-japan.com/images/blog//file/24746889209.pdfIn PDF document text
    • https://spazmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1b6393c8e7---90230134658.pdfIn PDF document text
    • http://www.bestlifepolicy.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160846d0e7bfe2---36359242272.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16076772b41667---kodorimarexubu.pdfIn PDF document text
    • http://www.dnevi-sekretarjev.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606d4d4c7eae8---59178940816.pdfIn PDF document text
    • http://bkbflooringusa.com/userfile/abbey/file/vorug.pdfIn PDF document text
    • http://gabortech.com/admin/file/kotujiladazewefexis.pdfIn PDF document text
    • https://mebelpozakazu.ru/wp-content/plugins/super-forms/uploads/php/files/e92206d4f27a0a738177e94e6490212c/biwejipopigawizetafuwup.pdfIn PDF document text
    • https://atphp.ch/userfiles/file/xisodijiwa.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/fowapunasimex.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
    • 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_off0000eca5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA5 5600 bytes
SHA-256: 5a972dec2a2aaf99c6749668bd8bc4c17929bf32cb54d6dc87b32c7f3234c9e2
font_01_sfnt_off0000ff84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF84 13168 bytes
SHA-256: 325e5cf356d4212d44dcee963d85c96f9360d161c00778a59cfaebfd8d64c1e5
font_02_sfnt_off0001296c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1296C 16144 bytes
SHA-256: 2a5444f7dab74392dc165025bde78e1115516e479657dde944d02551424fa928