Malicious PDF — malware analysis report

Static analysis result for SHA-256 498dcf737e18eef1…

MALICIOUS

PDF

93.4 KB Created: 2021-09-15 09:57:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d83142c3cb58797377acd4d69d7077ee SHA-1: 7bcca857852332f6f434b125bc93cef537f1ba76 SHA-256: 498dcf737e18eef1817d610ed5d67a93573104d454666edbe7a39fbbfbde32f4
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier. It contains numerous embedded URLs, many pointing to compromised WordPress sites, suggesting a link farm designed to redirect users to malicious content. The heuristic 'SE_SECURITY_BYPASS' indicates the document may instruct users to disable security software, further supporting a malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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
  • 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.
  • 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://philabc.ru/uplcv?utm_term=little+nightmares+download+android PDF link annotation
    • http://www.myhhsi.com/wp-content/plugins/super-forms/uploads/php/files/29c5cea0d1e07b36cf3c20e21d0ceff7/75953128628.pdfIn PDF document text
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/8b84b43f8950da8a575d95a055cd5daf/7806373287.pdfIn PDF document text
    • https://qualitycountscleaning.com/wp-content/plugins/super-forms/uploads/php/files/d64fb26e60c021844b84fbd29f58492f/jowugibutovaropomo.pdfIn PDF document text
    • http://dreesmann-foto.de/userfiles/file/51981297060.pdfIn PDF document text
    • https://www.accidentinjurylascruces.com/wp-content/plugins/super-forms/uploads/php/files/n1d38c19nc2ececvnhbktm6bao/67750501853.pdfIn PDF document text
    • http://associazionemillesogni.it/userfiles/files/57616611678.pdfIn PDF document text
    • http://bouwbedrijfansing.nl/userfiles/file/10471116930.pdfIn PDF document text
    • https://www.tratedu.net/ssss2018/assets/143ad273/ckfinder/core/connector/php/upload/userfiles/files/cf7b220f3bcd86d7e30f70357604501c.pdfIn PDF document text
    • https://12shio3.com/contents/files/lojutegonif.pdfIn PDF document text
    • http://elcivan.com/admin/UserFiles/file/kemowumikidozofaliwe.pdfIn PDF document text
    • https://slavica.ru/wp-content/plugins/super-forms/uploads/php/files/1036951d10d0c3ec9ef3e57bd1760d52/32866804462.pdfIn PDF document text
    • http://zoop-tech.com/ckfinder/userfiles/files/loranet.pdfIn PDF document text
    • http://zhatuogz.com/uploadfile/file/56703941693.pdfIn PDF document text
    • http://counterreaction.net/wp-content/plugins/formcraft/file-upload/server/content/files/1613f31c961775---sujoxegowijiripulelowawi.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/cfd4286670238770fa68f82f4ab2395a/mobuzomaxiposa.pdfIn PDF document text
    • http://ahcxdq.com/uploads/file/151455347131.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/161411ef5eff30---tegogojafeladus.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zolapakiwuged.pdfIn PDF document text
    • http://mallenmediations.com/mallenmediations/images/userfiles/file/lopugipukepapikuzo.pdfIn PDF document text
    • http://dilimkebab.com/userfiles/file/63564257378.pdfIn PDF document text
    • https://tadimtursu.com/image/files/43430191648.pdfIn PDF document text
    • https://birudongker.com/contents/files/95387430269.pdfIn PDF document text
    • http://teenmag.cz/userfiles/file/57760223453.pdfIn PDF document text
    • http://master-br.ru/img/file/bujaferiwugo.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_off000106cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106CB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00011ee2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EE2 10736 bytes
SHA-256: 52c10bd6685a3e9d4b4476b145008100209edb6125182c2571feece49f897a70
font_02_sfnt_off00013727.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13727 18704 bytes
SHA-256: 1892298302bc9bea5cb864f1e6c1904c886bc3b9d907da769920b0d4614ed925

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