Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b36aa6cf9142056…

MALICIOUS

PDF

84.6 KB Created: 2021-09-08 11:01:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f83d6bfc6225071f36025910476e2f4 SHA-1: be612305a6a98051db2c5f3efd2e3b43fe53b6ba SHA-256: 6b36aa6cf9142056a4f2c3e0744ee812263f9a6c470551e3dcec76eab7197dd1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains a link farm pointing to multiple compromised websites, which likely host further malicious content or phishing pages. The presence of numerous PDF links on disposable or compromised hosting suggests an attempt to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://aglogistics-bo.net/userfiles/file/81809498602.pdf In PDF document text
    • https://rffsev.ru/wp-content/plugins/super-forms/uploads/php/files/352eeac6776b81c1a60a5c36c194cdca/55474340030.pdfIn PDF document text
    • https://islandsvefir.is/wp-content/plugins/super-forms/uploads/php/files/milpuumcjmdsfdflkfmbsdage4/94152084394.pdfIn PDF document text
    • http://valeneighbors.com/userimages/63775402533.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/1607f65930481d---63954167699.pdfIn PDF document text
    • http://pnktools-th.org/ckfinder/userfiles/files/1527616760.pdfIn PDF document text
    • https://saraelv.no/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce9d868313---79844186484.pdfIn PDF document text
    • http://piqiso.ru/userfiles/file/23695251223.pdfIn PDF document text
    • http://krevue.cz/UserFiles/File/6987927591.pdfIn PDF document text
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/2tv28emuf9qreib3dv7vpv2471/turuteluwuril.pdfIn PDF document text
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16098ddc9d1ccf---xasijuzumozil.pdfIn PDF document text
    • https://www.solucionaesp.com/ckfinder/userfiles/files/lapokoro.pdfIn PDF document text
    • http://one9five.com/userfiles/files/32834588591.pdfIn PDF document text
    • https://akarchlight.com/wp-content/plugins/super-forms/uploads/php/files/1b47897fd61ad56772715cdabc7f45ae/17477791817.pdfIn PDF document text
    • http://www.cargeacrew.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1607f516601baa---fobupuxodiwejuvowa.pdfIn PDF document text
    • http://razaviota.ir/basefile/razaviotair/files/vajojiwepifakifapijivut.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1607da6cfbd103---66508449424.pdfIn PDF document text
    • http://carrozzeriabosini.net/userfiles/files/88488306417.pdfIn PDF document text
    • https://nbretail.com.vn/ckfinder/userfiles/files/pademonoge.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/setosiwibegaduro.pdfIn PDF document text
    • https://next-engineering.com/userfiles/files/16693927689.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=catecismo+de+la+iglesia+catolica+pdf+descargar+gratisPDF 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_off0000e554.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE554 10888 bytes
SHA-256: c93643a35ebb0e081de98a672f66cee79537b487d221b5c56d8d6cd1b58f3570
font_01_sfnt_off0000fe4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11661 18460 bytes
SHA-256: 954255d1bcef9c273ec410c83d38f7414b931a9e9ebd656d395ffc97dfad4434

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