Malicious PDF — malware analysis report

Static analysis result for SHA-256 d24077b51a05f532…

MALICIOUS

PDF

79.1 KB Created: 2021-09-19 02:56:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: efcadea3d9fb4210d8752a19a3426e77 SHA-1: 596ea995fb2e5b6b42eebd7a5bef545c997a3686 SHA-256: d24077b51a05f5322a3c384a634644f40208e3af0127cee5cbf88704d8232016
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a high number of external links, many pointing to compromised WordPress sites or disposable domains, indicating a likely phishing or malicious redirection campaign. The ClamAV detection and ML classifier strongly suggest malicious intent, consistent with a phishing lure designed to lead users to malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://smidgel.ru/uplcv?utm_term=ebook+devil+beside+you+you+zha PDF link annotation
    • http://northmarking.com/userfiles/files/duzininigudez.pdfIn PDF document text
    • https://phatgiaolongan.com/upload/ckupload/files/tipenipebejagivukanewamef.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/d36655e1cb904d708e339e30c615f843/zakatokawijodaguzomovibaj.pdfIn PDF document text
    • https://www.guestquesttravelmedia.com/wp-content/plugins/super-forms/uploads/php/files/7bhs5mecl0utar8mectu9ak12f/lepikilusawu.pdfIn PDF document text
    • http://dakov.hu/_user/file/11756588022.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/rudafifubojamumunogaz.pdfIn PDF document text
    • http://ambulatorioveterinariocigliano.com/userfiles/files/71856898298.pdfIn PDF document text
    • https://corpusbg.com/files/fck/file/bivak.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/68335594170.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/99220555824.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/56a53aebafdb969bb982666d90a73d88/41515071610.pdfIn PDF document text
    • http://intertexmedical.com/userfiles/files/wefurijuzuworozida.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/sufanidaguju.pdfIn PDF document text
    • http://ore-processing.ru/d/files/gesafizalit.pdfIn PDF document text
    • https://cian.hr/userfiles/file/mipuga.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/nezepavebi.pdfIn PDF document text
    • https://tpk-m.ru/files/file/kalifibog.pdfIn PDF document text
    • http://yuseigachi.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613579c77fafe---20008547118.pdfIn PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder/userfiles/files/75623886462.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/26082992809.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/girokemujulitumedijasope.pdfIn PDF document text
    • https://bilbox.es/wp-content/plugins/super-forms/uploads/php/files/e1bea53f09a744e0316f6041f25a240a/33555359236.pdfIn PDF document text
    • https://joefairless.com/wp-content/plugins/super-forms/uploads/php/files/2cc47f1a203ef356883dc18e89b204a3/dogedixegom.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/67525398777.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/matizasux.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_off0000cb02.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB02 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 10596 bytes
SHA-256: cc514630cda689da69809f06e4ba3ec65ed41050e7dfab82d01bc01b250379c9
font_02_sfnt_off0000fb77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB77 19016 bytes
SHA-256: e1052f41a0ffffd6db3d6ea9d4e76968611c896c65f750734ef7e8de06633896

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