Malicious PDF — malware analysis report

Static analysis result for SHA-256 11c7f19a81f6f714…

MALICIOUS

PDF

79.4 KB Created: 2021-09-03 00:50:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: 27b8f6363bb7df2883d907c3efec3aa4 SHA-1: a40721d2dd42170e90599ecf7dd2e27523a7aeec SHA-256: 11c7f19a81f6f714ab44a7b4dcd9a4d5c472a82bb1e6ea6be3ab461f32f720c2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The presence of these links suggests an attempt to lure victims to external malicious sites, likely for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • 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.
  • 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://advancedbusiness.co/wp-content/plugins/super-forms/uploads/php/files/9a1aeeddd2949ff8b054de20e4c7e34d/wufuwejikejutefexewa.pdf In PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/160bcc3c11cb25---jikipaxawelonaxikagi.pdfIn PDF document text
    • https://www.ideaklinik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f6118ddc22---92493414390.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608cd94750c97---mefirinib.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/k64qi8sj5tromcpjjm68op0qn0/kefatobusafusubufavowo.pdfIn PDF document text
    • http://mcutech.net/upload/2021/06/file/16232334191765685977.pdfIn PDF document text
    • https://www.emma-solutions.de/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72fdc875f---44218122002.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/cbc7cf2b3b42a17efe6ac1a4bf45c768/norotupuwinonunekili.pdfIn PDF document text
    • https://kraftyz.in/ckfinder/userfiles/files/xoziruzikerukalijif.pdfIn PDF document text
    • http://www.verneteco.com/ckfinder/userfiles/files/xovoxamofi.pdfIn PDF document text
    • http://ritadas.in/userfiles/file/jukisufo.pdfIn PDF document text
    • https://www.andimoda.com/wp-content/plugins/super-forms/uploads/php/files/380bd9640690d8d4793ce61f40eb284e/tunanigemikeka.pdfIn PDF document text
    • https://singaporeroadshow.com/wp-content/plugins/super-forms/uploads/php/files/71cbdbfe0ae2fab0da04c6fb5ebb7fbb/61615788445.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/mofakazama.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/160862ff57ff53---fomanameruveg.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/balelevaleratotitonog.pdfIn PDF document text
    • http://screen.by/images/file/nufelavosesatefogene.pdfIn PDF document text
    • http://jcon-aps.dk/userfiles/file/46250222186.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/14065117583.pdfIn PDF document text
    • http://fullx.net/files/piwiniwaveruzolu.pdfIn PDF document text
    • https://amrapalispot.com/userfiles/file/puvupoligetivuj.pdfIn PDF document text
    • https://big-affaires.com/img/pics/files/55377187121.pdfIn PDF document text
    • https://www.vbclighting.com/wp-content/plugins/super-forms/uploads/php/files/f58e8fb14510363655d07c89f760aba9/36018085334.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=potentiometer+circuit+diagram+and+working+pdfPDF 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_off0000d4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4BA 11028 bytes
SHA-256: 4e3039882581acb468bd38a8c1b64e91dd106d61d6968314576411bb54fe5938
font_01_sfnt_off0000ee3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3C 16332 bytes
SHA-256: 54a9401f704f6159a335fc634926ef81dae826330cb707a8fa0d050510406b4c
font_02_sfnt_off00011813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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