Malicious PDF — malware analysis report

Static analysis result for SHA-256 c7618df27dbfe1ac…

MALICIOUS

PDF

78.6 KB Created: 2021-09-06 14:52:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d994199619d0fbc81ad2217bbc2da0f5 SHA-1: c4faba17338d6e45f404a773152516e025f2359f SHA-256: c7618df27dbfe1ac755a7a138c8b6f750d3f6f925be8dd69733f63d2b7ac3443
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics suggest it functions as a link farm, directing users to various compromised WordPress upload storage locations and disposable hosting sites, likely as part of a phishing or malware distribution scheme. The presence of invoice-related language further supports a lure-based attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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 http://kayapaliinsaat.net/file/5399517521.pdf In PDF document text
    • https://newoptic.mn/uploads/files/vamapagipigemesusidikitu.pdfIn PDF document text
    • https://profix.fr/ckfinder/userfiles/files/pibazejofaxusudesoxedu.pdfIn PDF document text
    • https://greyquotient.com/wp-content/plugins/super-forms/uploads/php/files/c11bf51dee08d9c6a27ed865fa0286e6/47957491708.pdfIn PDF document text
    • https://wildnaturetravel.com/File/votum.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afb24bbc195---zajewa.pdfIn PDF document text
    • http://www.alcera.ca/userfiles/file/73158915761.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/s9kipftkdi3qetigep51phuieg/63306864806.pdfIn PDF document text
    • http://yatros.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160a11541bc320---gililikebafivopunuwur.pdfIn PDF document text
    • http://autoscuolecasetta.it/userfiles/files/32151231876.pdfIn PDF document text
    • http://willtorock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c1cc398ee8a---gurataduzopavodujowemen.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/762308195f26b0355be54a5093985fd4/kamevigufomi.pdfIn PDF document text
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/16097dead3a19e---wotaraduwodonup.pdfIn PDF document text
    • https://dedywiredja.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7bea38d1de---zurigirezuzalategimiba.pdfIn PDF document text
    • http://qwerty.pl/_data/file/91138790592.pdfIn PDF document text
    • http://balbu.hu/uploads/news/file/gudalosumuwamaboriboda.pdfIn PDF document text
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608ba7a2d421e---39645110028.pdfIn PDF document text
    • http://shqinze.net/admin/upimg/file///kegasazeboje.pdfIn PDF document text
    • http://alt-1c.ru/userfiles/file/witebazepaxanobowa.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/49048054969.pdfIn PDF document text
    • https://shining4u.com/wp-content/plugins/super-forms/uploads/php/files/1f82e3f8152a59e9097a83c215020cae/wavexedafedapokuzudumubet.pdfIn PDF document text
    • https://roweryelectra.pl/app/webroot/uploads/file/16229015752293.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/75337052774.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/nuvuziz.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=subsidiary+books+notes+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_off0000d108.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD108 10968 bytes
SHA-256: 34a2a4ba1afca20f5bae7262ac7ecdaf7be13c9d5f94a626aa12570234056a9b
font_01_sfnt_off0000ea65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA65 16540 bytes
SHA-256: a521dc6e038d5e08c8124a0f1b244d8819fc5066a5296c65374db4ff765e38e9
font_02_sfnt_off000114bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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