Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d26de99fb03c3e4…

MALICIOUS

PDF

102.3 KB Created: 2021-07-13 05:29:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: e0785df1263d30c67a056eda1148e5e7 SHA-1: 162761ee12b7e06263e15192cdbf02a570461a5e SHA-256: 8d26de99fb03c3e49173d6aefd46449d9d9d9effe75fda3e8e78f8bb136ff21a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains numerous embedded URLs pointing to compromised websites, indicating a phishing or malware distribution attempt. Heuristics suggest it functions as a link farm on disposable hosting, with one URL specifically mentioning a 'database systems' search term, potentially luring users with a fake document. The ClamAV detection and ML classifier strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://pistant.ru/uplcv?utm_term=database+systems+design+implementation+and+management+9th+edition PDF link annotation
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/cd0ec740ec04aec0f7924116d1146eee/68211173776.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/0b14df0fd31b2065a4936d666d8df022/biverijafaxegogexotakilu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afac1658ad0---zubunivebujimufiwo.pdfIn PDF document text
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a8a7a537a11---74471795841.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/00e4f4b5225d246ddbfd336e26b4de99/74700701244.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071b7f23950e---giguxadabufo.pdfIn PDF document text
    • http://ventilatoryzlin.cz/images/file/25053047803.pdfIn PDF document text
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608cac7d2ff08---dakilifitubumelagodew.pdfIn PDF document text
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/me8dvbqq6nnane8f8vno687ehl/gupezasuwiditunogafemita.pdfIn PDF document text
    • http://www.loockuniformes.com.br/home/wp-content/plugins/formcraft/file-upload/server/content/files/160bca77707744---fuxowuvisebalot.pdfIn PDF document text
    • http://statsale.com/data/upload/ck/files/86627047220.pdfIn PDF document text
    • https://emilline.dk/ckfinder/userfiles/files/52297277860.pdfIn PDF document text
    • http://slsnn.ru/content/file/98088509718.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160720c1f79da3---16488342222.pdfIn PDF document text
    • http://kag.fr/userfiles/file/72548396393.pdfIn PDF document text
    • http://nuyewpilot.academy/wp-content/plugins/super-forms/uploads/php/files/c48b7e304ec807e6b9489548563b5854/maxewibitine.pdfIn PDF document text
    • https://uleiuri.ro/userfiles/file/natoziz.pdfIn PDF document text
    • http://www.lavalledesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b640f095938---sukepudokez.pdfIn PDF document text
    • http://serendipityorlando.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bfcac9dd380---novajuv.pdfIn PDF document text
    • https://agrilaui.com/userfiles/file/jotexufujaf.pdfIn PDF document text
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160e4a850c9527---8319805831.pdfIn PDF document text
    • http://www.k-24.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861cbf59f16---dimofixat.pdfIn PDF document text
    • https://machinex-machines.com/UserFiles/File/boxinowojul.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/160904126e15a8---munebu.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/35c7f04201d5dddc6f2bdb4af35136ec/41264842192.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_off00012a25.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A25 11160 bytes
SHA-256: 0334adcc602200aadced8e3ffe44ad1ccd8b9ee9df0848034be7cde22ca62092
font_01_sfnt_off000143a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00015bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15BBB 17988 bytes
SHA-256: aee3be8e5b309117779283b8c04d92d700e832e081837c1761909d343c8ae0c7

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