Malicious PDF — malware analysis report

Static analysis result for SHA-256 e74b2f0c0ff7c319…

MALICIOUS

PDF

81.3 KB Created: 2021-09-17 00:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 232755d6866e471439f46b860cd1fcf8 SHA-1: a64859fd6f9aa80d02062f0b9e7151f235541d1e SHA-256: e74b2f0c0ff7c319f755bb75fc0917fd3e66284dd28a2b68d39742768a081b19
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially compromised websites, indicating a link farm designed to distribute further malicious content. The presence of a 'download button' heuristic and the overall structure suggest a phishing or malware distribution attempt, likely delivered via spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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
  • 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://techscreening.com/userfiles/files/sosexivisapaverov.pdf In PDF document text
    • http://gimhaejazz.com/fckeditor/userfiles/image/fanil.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/jisinofesazimedadajadomeg.pdfIn PDF document text
    • http://soldearenales.com/galeria/files/dixil.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1612fc274ee774---warev.pdfIn PDF document text
    • https://saleskerala.com/ckfinder/userfiles/files/28551033486.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/ba3b8c737fbc2904474f23916c367217/91764702373.pdfIn PDF document text
    • http://kimdaiphatsteel.com/Images_upload/files/15597887765.pdfIn PDF document text
    • http://creaorganization.com/depo/sayfaresim/file/supipiwekigol.pdfIn PDF document text
    • http://kengosushionlineorder.com/uploads/files/mefitip.pdfIn PDF document text
    • http://scvumaichiramen.com/uploads/files/lokosizozov.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/2694513530.pdfIn PDF document text
    • https://i-intelli.com/ckfinder/userfiles/files/24655487855.pdfIn PDF document text
    • http://sydjpg.com/images/upload/file/20210913_232337_163.pdfIn PDF document text
    • http://dieukhactransam.com/uploads/files/vokugo.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16141f07ff03fa---potisumipopuwuralokabu.pdfIn PDF document text
    • http://ulv-fogger.es/d/files/laduri.pdfIn PDF document text
    • http://4seasonstours.in/userfiles/file/87267307551.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141e2a673333---repelavalozegefa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e652524f9f---70192575277.pdfIn PDF document text
    • http://smartdeal.pl/files/upload/files/masikimegazobuxinevugita.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16141b7f12a89e---64799762627.pdfIn PDF document text
    • http://marisqueandopremios.com/campannas/file/zamenij.pdfIn PDF document text
    • https://cmf8.ir/data/file/tazonemivo.pdfIn PDF document text
    • https://www.energetisch-therapeut-estie.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5bacebc9b---zitaso.pdfIn PDF document text
    • http://www.cerathai.com/image/upload/File/wurujuratokexi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=download+vidmate+apk+for+android+latest+versionPDF link annotation
    • http://s292376414.onlinehome.fr/datas/imgmail/file/73641963640.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_off0000d665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD665 18184 bytes
SHA-256: d9f26d1df294065dbfed6175f27439b7b502fc862167696b0c890011d34e6f7d
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 10904 bytes
SHA-256: ff2e2168485de53bf0667a6d2685e8d5a837b3fdae5aa9816a5838ce0d7c7708
font_02_sfnt_off00011edd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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