Malicious PDF — malware analysis report

Static analysis result for SHA-256 b46ae1c676ecddb5…

MALICIOUS

PDF

89.2 KB Created: 2021-09-08 12:29:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 7d8227fc14b7bd5465aa9371a4f029f9 SHA-1: 3de134efa7177bab66114d79c9f21b82d7491749 SHA-256: b46ae1c676ecddb5942522f9775d7ad683969fc0ebf52e3960f0679b35414783
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable hosting or compromised CMS upload directories, indicating a link farm designed to obscure the final destination. ClamAV and ML classifiers also flagged this PDF as malicious, specifically as a phishing trojan. The presence of JavaScript suggests an attempt to execute malicious code or redirect the user.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oletrans.sk/editor_uploads/files/73997962151.pdf In PDF document text
    • http://reversetheclocknow.com/ckfinder/userfiles/files/tixunomorezoridepejur.pdfIn PDF document text
    • http://scard.vn/app/webroot/uploads/files/konigopibogop.pdfIn PDF document text
    • http://bergepkolcsonzo.hu/userfiles/file/82122043100.pdfIn PDF document text
    • https://chatsystem.site/js/ckfinder/userfiles/files/50322211621.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210908083103.pdfIn PDF document text
    • https://laneopx.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132a003e1dfa---vovawijamibibirevovo.pdfIn PDF document text
    • http://ozt.zielonetarasy-cieplice.pl/uploads/userfiles/files/natadupigajezabuditi.pdfIn PDF document text
    • http://progetec.org/userfiles/files/sutezukatovowikumo.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/30696353887.pdfIn PDF document text
    • http://fabiocaronearchitetto.com/userfiles/files/tukozilizesipozewa.pdfIn PDF document text
    • http://bbmeti.it/userfiles/files/nibupe.pdfIn PDF document text
    • http://bsl-trans.ru/admin/ckfinder/userfiles/files/36524311311.pdfIn PDF document text
    • http://twfbs.com/ckfinder/userfiles/files/bejegewidosili.pdfIn PDF document text
    • http://nena-artspace.com/ckfinder/userfiles/files/wujodebutonazagumuxifa.pdfIn PDF document text
    • https://bor-diing.com/upload/files/tezologidusimetufuji.pdfIn PDF document text
    • http://dijladentalcenter-qa.com/userfiles/file/66204429345.pdfIn PDF document text
    • http://pujcovnanaradi-tvarozna.cz/userfiles/files/41820655178.pdfIn PDF document text
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/27742180473.pdfIn PDF document text
    • http://xn--80aaa1acmiejxr6d7fg.xn--p1ai/data/files/papebekola.pdfIn PDF document text
    • https://transmar.biz/ckfinder/userfiles/files/4941131450.pdfIn PDF document text
    • http://makaifruits.com/wp-content/plugins/formcraft/file-upload/server/content/files/161380ac390520---5801368853.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=wechselnde+einsatzstellen+pdfPDF link annotation
    • http://kioskcondoweb.wpengine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161345d3fe0296---bapiturelajikekazenozin.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_off0000f2dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DD 20852 bytes
SHA-256: d19176f7ddd5371633fdba83daecfbb4c7131b7d4bf1e274862d795413963d46
font_01_sfnt_off000126f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126F5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013f0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F0C 10552 bytes
SHA-256: 6eb6b9ed0115f23c03957cb76b011dcd3eb384651aa1eed0468957acbdb31704

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