Malicious PDF — malware analysis report

Static analysis result for SHA-256 f13342e09e707c9f…

MALICIOUS

PDF

70.9 KB Created: 2021-09-28 22:45:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ce868f11b2ecf2071f861ead5a4049bf SHA-1: 9d8468413da0a6ff45871b5c6feab1f5874ef3e7 SHA-256: f13342e09e707c9fca37edad4c7e6dc95e75653a8dc7ef6c7e0bb694c61171be
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous external URIs, many pointing to compromised or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded JavaScript, flagged by heuristics, further supports malicious intent, likely to execute further malicious actions or redirect the user. ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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.
  • 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 https://taipeitccia.org/CKEdit/upload/files/somegapesotapu.pdf In PDF document text
    • http://tanriovermensucat.com/uploads/genel/files/zedaduzokakijilidededif.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/miridixusajabezolulur.pdfIn PDF document text
    • http://alexandersorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/60442303533.pdfIn PDF document text
    • https://kltccompany.com/ckfinder/userfiles/files/89431627977.pdfIn PDF document text
    • http://vhz.cz/user-files/2563615983.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/govev.pdfIn PDF document text
    • https://zilalcooling.com/other_files/File/wijajewimege.pdfIn PDF document text
    • http://showpalmedical.com/userfiles/gefeloxemutawazefewiw.pdfIn PDF document text
    • https://happyjourney.webtrails.in/ckfinder/userfiles/files/pemaviwogujogok.pdfIn PDF document text
    • http://versobrokers.eu/userfiles/files/fetigil.pdfIn PDF document text
    • https://privatecambodiatour.com/userfiles/file/velas.pdfIn PDF document text
    • http://maradonasalud.com.ar/ckeditor/ckfinder/userfiles/files/jebadazodikubinopuzot.pdfIn PDF document text
    • http://ramseier-appenzell.ch/elrada/js/ckfinder/userfiles/files/pozotatuzaroribafuvodife.pdfIn PDF document text
    • https://fleschimmo.lu/userfiles/files/82732424351.pdfIn PDF document text
    • https://etcbt.com/userfiles/file/78985987443.pdfIn PDF document text
    • https://altaitur.com/ckfinder/userfiles/files/31411015196.pdfIn PDF document text
    • http://elenasteele.com/wp-content/plugins/formcraft/file-upload/server/content/files/161535b225fbc7---dobezupajefusojizig.pdfIn PDF document text
    • http://lotuscourtpune.com/wp-content/plugins/super-forms/uploads/php/files/7074adf9572eab08cb2a327f73e8c4d8/71681728349.pdfIn PDF document text
    • http://hoya-system.com/uploads/files/202109290245193739.pdfIn PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1612fafc0d818a---merotiwuwemijaju.pdfIn PDF document text
    • http://hueide.com/upload/files/jewavape.pdfIn PDF document text
    • https://acconpriti.com/ckfinder/userfiles/files/tudokovopimelixam.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=free+ppv+boxing+streaming+sitesPDF 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_off0000b186.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB186 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c998.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC998 16272 bytes
SHA-256: a068ddcbfb98dbdfe608cbb783baef195b60c98620cf75851ad910ac3f04a468
font_02_sfnt_off0000f341.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF341 10832 bytes
SHA-256: 62679c74595f6dd56bf15aa0335ab06a7ee6ece2ccbfa6e24a86678b5c01de0c

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