Malicious PDF — malware analysis report

Static analysis result for SHA-256 87fceee0832f7cc8…

MALICIOUS

PDF

96.4 KB Created: 2021-09-02 13:08:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 04d2f3a4c877e7c65dce57f27048ed5c SHA-1: 8ef8cb41a56d2a00b72ca79d2752434b9992ec72 SHA-256: 87fceee0832f7cc84d18192b09ef00e55db2ba42a5fe9920623eaa4be2000c7d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs that point to various websites, many of which appear to be part of link farms or compromised CMS uploads, suggesting a phishing or malware distribution scheme. The PDF structure and embedded content are consistent with attempts to lure users to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9889

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://ketchas.ru/uplcv?utm_term=philostratus+gymnasticus+pdf PDF link annotation
    • http://kuehllawpc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53017209281.pdfIn PDF document text
    • https://anthonygillant.com/userfiles/file/penolebegibazoriso.pdfIn PDF document text
    • http://domplus.su/userfiles/files/9007775579.pdfIn PDF document text
    • http://mariopresto.pl/userfiles/file/sezolarozunewiwezinifi.pdfIn PDF document text
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d07954326a1---78419860874.pdfIn PDF document text
    • https://brokenspoke.com/wp-content/plugins/super-forms/uploads/php/files/49846efc99ca8633f00c461d82647ec3/zopowasudodijinov.pdfIn PDF document text
    • http://svenstavik.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756d43283fa---remeniwakavif.pdfIn PDF document text
    • https://adiwirawanbali.com/wp-content/plugins/super-forms/uploads/php/files/5b3b846f1bf7e4d7f9a4961b17ea5ba8/40355874993.pdfIn PDF document text
    • http://locnuocvietmy.com/Images_upload/files/xesujevivibodirigen.pdfIn PDF document text
    • http://julieesteban.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a06a60b0f33---wamifegedodokavuzawekojob.pdfIn PDF document text
    • http://delawaretravelmedicine.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072a71e9ed75---kimap.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f11318b872---73079125168.pdfIn PDF document text
    • http://kasargod.net/uploads/file/tokedajojefaruvix.pdfIn PDF document text
    • http://klhl.com/userfiles/file/5540555282.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/54215193817.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/xofelewasekamuwagurubozod.pdfIn PDF document text
    • https://oykufestivali.com/ckfinder/userfiles/files/68992229375.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f8513c9df89---zurozome.pdfIn PDF document text
    • https://visionbrindes.com/admin/fckeditor/userfiles/file/51079127460.pdfIn PDF document text
    • http://creationart.hu/files/file/80584564568.pdfIn PDF document text
    • http://vegasoft.hr/wp-content/plugins/formcraft/file-upload/server/content/files/1608845498430f---darafifitekadujedetir.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16085d00d1f4f1---towupaxenetawofigeporovoz.pdfIn PDF document text
    • https://rosedreamholidayhomes.com/ckfinder/userfiles/files/joxudotarejam.pdfIn PDF document text
    • https://rijst.nu/userfiles/file/dekeguvatelule.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1608959246c69f---towadodafezumowujagobot.pdfIn PDF document text
    • http://smflow.in/admin/uploads/file/nolipovimenonozo.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1608e5306aa9fd---gobone.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_off00010a50.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A50 11152 bytes
SHA-256: 6141591ff31591a59a53f5542de69a7dc13c3fc111613876762b8bfdc6f926fc
font_01_sfnt_off00012404.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12404 21488 bytes
SHA-256: a8ed91f6ae0fead3cafb3408b1216a2388d6d3384a865cec0e5171fe7e7af0b7
font_02_sfnt_off00015b65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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