Malicious PDF — malware analysis report

Static analysis result for SHA-256 070ea98cae72fc8b…

MALICIOUS

PDF

81.5 KB Created: 2021-09-12 08:02:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: d4d84849ca4146ec5b76f701cc8d8c07 SHA-1: a344ed161b1ad68b9ffac1390d0b1377bc5fe5ab SHA-256: 070ea98cae72fc8b831de273ad97cef17745ef54f0f38264ad61de062284e146
204 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains heuristics indicating it's a link farm pointing to compromised CMS uploads and potentially disposable hosting, suggesting an attempt to distribute malware. The document also contains instructions to disable security software, a common tactic in malicious lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • 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://hondasushi.com/uploads/files/50601066213.pdf In PDF document text
    • http://www.hgbehringer.de/img/files/files/defawawi.pdfIn PDF document text
    • https://imotrading.com/images/userfiles/wojuluneso.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/laburedir.pdfIn PDF document text
    • http://sujitonweb.com/userfiles/files/56441165168.pdfIn PDF document text
    • https://nonbodepsg.com/uploads/files/60361492909.pdfIn PDF document text
    • http://dija.lv/public/userfiles/file/29743398889.pdfIn PDF document text
    • https://intrigantka.ru/images/userfiles/file/rifitegakor.pdfIn PDF document text
    • http://www.appsolutely.sg/wp-content/plugins/formcraft/file-upload/server/content/files/1613d320ce380a---bapopasetoxumaxafuba.pdfIn PDF document text
    • http://kingsfinancialconsulting.com/userfiles/file/8494082317.pdfIn PDF document text
    • http://e68momo.com/shopadmin/upload/files/tilunoxagedibide.pdfIn PDF document text
    • https://rarahil.org.np/ckfinder/userfiles/files/37829628346.pdfIn PDF document text
    • https://beruanglucu.com/contents/files/82916201090.pdfIn PDF document text
    • http://mrtowing.ca/Lawyers/userfiles/file/zibuxoxe.pdfIn PDF document text
    • https://ijtm.in/userfiles/file/45627387332.pdfIn PDF document text
    • http://www.alwaysflorida.com/wp-content/plugins/formcraft/file-upload/server/content/files/161305bcd56aad---veduvosevizodowu.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/kokizegitero.pdfIn PDF document text
    • http://stringladies.cz/userfiles/96968703636.pdfIn PDF document text
    • https://beldapromosyon.com/calisma2/files/uploads/93999253072.pdfIn PDF document text
    • http://datcat.vn/2018/file/nalebivotex.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/64921710764.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613bca650d631---jotewigofolupeteteja.pdfIn PDF document text
    • https://torbay.ru/images/uploads/file/xetimeviwur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=download+five+nights+at+freddy%27s+help+wantedPDF 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_off0000d5e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5E7 18452 bytes
SHA-256: 69d25efd7992a2badf734bdd2945048a32e762551f70b27f77c056e1feeb0e49
font_01_sfnt_off00010620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10620 11076 bytes
SHA-256: 760c5e1d3068cdd3b2c5622fb4d91f927f2710bb0f97a99d7fdfece3db3e0267
font_02_sfnt_off00011fc7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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