Malicious PDF — malware analysis report

Static analysis result for SHA-256 553682910a0744d7…

MALICIOUS

PDF

79.5 KB Created: 2021-09-03 05:04:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 45ed5a6b5bf10cf63edaa3597a7c5a04 SHA-1: 7e200b62f584f1e31a234b1d0a4d9dc964f88bd1 SHA-256: 553682910a0744d7b5d3e6555596dd3ab6adfe7a49335a02aa141be1db610c25
164 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple links pointing to external PDFs hosted on various domains, some of which appear to be compromised CMS uploads, suggests a link farm designed to redirect users to malicious content or phishing sites. The 'SE_DOWNLOAD_BUTTON' heuristic further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • 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 http://stamforgtechnologies.com/uploads/3418292131.pdf In PDF document text
    • http://alpha-th.com/userfiles/file/kijolodus.pdfIn PDF document text
    • https://jclifeschools.org/wp-content/plugins/super-forms/uploads/php/files/24dcc6565aed553abb441a8489e24e37/relutiniwapajuz.pdfIn PDF document text
    • http://gerd-pollak.de/userfiles/file/60162887029.pdfIn PDF document text
    • https://angelsforwarriors.org/userfiles/files/juwomufalasawu.pdfIn PDF document text
    • http://beccaro.it/userfiles/files/lesakik.pdfIn PDF document text
    • http://ohappy.org/userData/board/file/14799792680.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/ad010db609283c300dc25e4dbe4ea88f/xubezovi.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/51a11c10422fb1fb09016ccef913a5b6/4694452591.pdfIn PDF document text
    • http://ggled-smot.com/ckupload/files/zabeposobiw.pdfIn PDF document text
    • https://argumentua.com/i/file/94921285796.pdfIn PDF document text
    • http://polloricowings.com/uploads/files/dogudanagapu.pdfIn PDF document text
    • http://chrislahoda.ca/userfiles/file/93316301685.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/3820136b30bf2f5bf661972694bafcd9/66334989305.pdfIn PDF document text
    • http://dui-antidote.net/images/userfiles/file/tefivawapopezeputakuride.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1607dcdbcd29fd---47898209779.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/lisejiselowuwuzodoma.pdfIn PDF document text
    • https://isleo.com/i_photos/file/xojunefakivagatenepirix.pdfIn PDF document text
    • http://www.uc-kushiro.net/images/library/File/58219672323.pdfIn PDF document text
    • http://fcv-bo.org/data/fcv-bo/userfiles/file/manegade.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612526299a6ce---62657973404.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/zejutedofidipa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=fundamentals+of+financial+management+14th+edition+pdf+downloadPDF 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_off0000cf3d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF3D 11260 bytes
SHA-256: ede7eeaecbfbba155cd5df2e7e2d3a5f671ceac4098b47f3a13863f59cd80a9a
font_01_sfnt_off0000e965.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE965 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010177.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10177 17904 bytes
SHA-256: f33d56d9a91c1399ac78df1e50d6291ea06c9af3592c2650f0dd0301262e2941

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