Malicious PDF — malware analysis report

Static analysis result for SHA-256 889483bc845d4585…

MALICIOUS

PDF

85.3 KB Created: 2021-07-07 16:27:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: 4fa8e78dec091821845fd103d2792ac2 SHA-1: 590044d380587b344b2cad46e31585a2555023ec SHA-256: 889483bc845d4585b09991c3f0bd19b68ed71b8e77cf6867bb463053c320bea9
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to compromised WordPress sites hosting other PDF files, indicating a link farm designed to redirect users. ClamAV and ML classifiers flagged this as a phishing trojan. The presence of multiple external URIs and a link farm heuristic strongly suggests a malicious intent to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 6

  • 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.
  • 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 http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b08c81e744b---dokutuzaboparuso.pdf In PDF document text
    • https://senzedigicraft.com/wp-content/plugins/super-forms/uploads/php/files/b1f3e4fbca932314a8d128d1a7a7ab71/17287348815.pdfIn PDF document text
    • https://www.saenger-ohg.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607c47f29973b---13544021469.pdfIn PDF document text
    • http://ngor2-3.com/file_media/file_image/file/parizaj.pdfIn PDF document text
    • https://wecafephuket.com/wp-content/plugins/super-forms/uploads/php/files/ljpjh5chdm10l5gafqjmnv42lq/jarirutodemef.pdfIn PDF document text
    • http://champaigncursillo.com/userfiles/file/17883523920.pdfIn PDF document text
    • https://aneri12.cz/res/file/rekalodaral.pdfIn PDF document text
    • http://bioident.pl/photos_fck/file/62805765857.pdfIn PDF document text
    • http://www.ambredore.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606e3b3ca0021---jeluriwejulivujele.pdfIn PDF document text
    • https://aterhesseg.com/up_image/file/43312343214.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1608c0d0df39ca---baramurov.pdfIn PDF document text
    • http://maidichike.com/upload/files/pafugoj.pdfIn PDF document text
    • https://regeneracion-capilar.com/wp-content/plugins/super-forms/uploads/php/files/61cc93e2f07719a974552980d07e8aeb/80097698267.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe7a711223---20844099885.pdfIn PDF document text
    • http://hawks79.com/clients/85064/File/gojevok.pdfIn PDF document text
    • https://www.ltgpartners.com/wp-content/plugins/super-forms/uploads/php/files/427622f26484ffa3d992afdc50765e10/beworadonanerofowel.pdfIn PDF document text
    • https://taichielite.com/louis/taichi/ckfinder/userfiles/files/74670546942.pdfIn PDF document text
    • https://kachhiproperties.com/wp-content/plugins/super-forms/uploads/php/files/pfj9c9gnara5uj8e1dhophs876/55188429105.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d76a7f2eb23---32712722836.pdfIn PDF document text
    • https://movesforfree.com/wp-content/plugins/super-forms/uploads/php/files/vr8c0694tv7pesftlnsrh41uc1/fefutof.pdfIn PDF document text
    • http://bettekingproductions.com/clients/874300/File/nulosubebarewesasujugemes.pdfIn PDF document text
    • https://spencershaulageltd.co.uk/wp-content/plugins/super-forms/uploads/php/files/bab1afd57c2ec4e6d064928ad310ed57/dativuwuxumogiges.pdfIn PDF document text
    • https://soba05.org/wp-content/plugins/super-forms/uploads/php/files/083050054b9dd1404ae574ff28fecad4/nadubasuv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=fork+witch+wormPDF 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_off0000ec18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC18 17312 bytes
SHA-256: 457d169131222cc9d556ffe6f36b620a393614dba3e2b55e636a2d38c08ee2eb
font_01_sfnt_off000118bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118BC 10040 bytes
SHA-256: 3023b1eeb48af59b392b73bce8075977938ef89bc220ef32aed4a290deaf816f
font_02_sfnt_off00012f10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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