Malicious PDF — malware analysis report

Static analysis result for SHA-256 298df0c790aae4a3…

MALICIOUS

PDF

86.1 KB Created: 2021-09-18 14:18:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 20b89681990962a747f3573567de1af6 SHA-1: 8a68d25d7eb33cd27fd376e68da67c34130bdc10 SHA-256: 298df0c790aae4a30f97e7ec86ca8dc9b219ef69daaa0127fada11e31df5726d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code within documents. The file also hosts a large number of external links, many pointing to compromised websites or disposable domains, suggesting a link farm or phishing lure. ClamAV detection as 'Pdf.Phishing.Trojan' further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://anitt.in/ckfinder/userfiles/files/busuporomikekenutiseg.pdf In PDF document text
    • http://tidomusica.com/uploads/files/202109040242307813.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/woparug.pdfIn PDF document text
    • http://lavera.it/wp-content/plugins/formcraft/file-upload/server/content/files/161355635c8491---22358313826.pdfIn PDF document text
    • http://n-production.com/upload/fckeditor/file/pipevataguxibibagefot.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/rogeretate.pdfIn PDF document text
    • http://www.parkwaytransplant.com/media_upload/upload/files/88043454338.pdfIn PDF document text
    • http://limobebe.com/userfiles/files/99493371554.pdfIn PDF document text
    • http://taketty.xyz/js/ckfinder/userfiles/files/56749118661.pdfIn PDF document text
    • http://kaies.net/upfiles/file/45056387424.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/93076000321.pdfIn PDF document text
    • http://emblem4home.com/UserFiles/Member/File/zarupixu.pdfIn PDF document text
    • https://hunghiephuylog.com/upload/files/gewumuwofor.pdfIn PDF document text
    • http://qhzs88.com/admin/fckeditor_upfiles/file/2021090407080080554.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/vomusisiwowujazaze.pdfIn PDF document text
    • http://jgbt.us/pds/userfiles/files/68658850673.pdfIn PDF document text
    • https://odontologosmalca.com/images/userfiles/file/biwigijebemipu.pdfIn PDF document text
    • https://gulertrafik.com/wp-content/plugins/super-forms/uploads/php/files/5q5slqnef67efghesc95s88pc9/3874718648.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/97927711427.pdfIn PDF document text
    • http://gianniarnaudo.com/userfiles/files/lenegazulavedojadij.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/12352552946.pdfIn PDF document text
    • https://www.costaverde.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612fea035d317---33020202616.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/toginulebikagevep.pdfIn PDF document text
    • http://kibbkw.com/uploads/files/gariwelarofudopamena.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=how+to+tile+print+a+pdf+on+macPDF 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_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 10688 bytes
SHA-256: de0407561e09bf7cacf42b7db11d63981c138651b03f9ac185c0ec53892ff5bd
font_01_sfnt_off00010392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10392 18428 bytes
SHA-256: 92293f2aef4ca6cb1a20352fd389df35299478015da255fe9b8625df7852ca82
font_02_sfnt_off000132d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x132D5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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