Malicious PDF — malware analysis report

Static analysis result for SHA-256 baffcf640aa56414…

MALICIOUS

PDF

82.3 KB Created: 2021-08-24 09:29:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d5fa76fadcf8d43e9871c28221c026a9 SHA-1: 974957c55cb714de521fceec0631d5d436e88091 SHA-256: baffcf640aa5641425445363cbed95e217e0319cf75f04372a6e85403f4d2e70
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating it's a phishing or trojan delivery mechanism. It functions as a link farm, with numerous URLs pointing to compromised WordPress sites that host further malicious PDF files. These links are designed to lure users into downloading and potentially executing further malware, or to engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/16107b007b99ca---wivakakireviziguwase.pdf In PDF document text
    • http://www.etoiles-recrutement.com/wp-content/plugins/formcraft/file-upload/server/content/files/160861b3c3dab0---15532620217.pdfIn PDF document text
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a07caaeb61e---98971928065.pdfIn PDF document text
    • http://gusanhightec.com/userData/board/file/46899071349.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160ab763c9160e---28007249315.pdfIn PDF document text
    • https://petribax.nl/userfiles/file/ketelasumapezogeno.pdfIn PDF document text
    • http://donleroy.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanolotizivajedeji.pdfIn PDF document text
    • https://servicepapik.ro/files/samas.pdfIn PDF document text
    • http://aaexpansionjoint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ba923955---selej.pdfIn PDF document text
    • http://medicamarsala.it/userfiles/files/forifakobolawuxi.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7267f256d3---vetilapupogi.pdfIn PDF document text
    • http://www.asslar.de/downloads/xedisewepagisor.pdfIn PDF document text
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/d51c9d13a6cd16288e33987f4b0601ae/11657721894.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/58lskqkf8lrm6vtv7b2bbvktgs/vavexuw.pdfIn PDF document text
    • http://rfinshaat.az/userfiles/file/9091922709.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/semobivesawugege.pdfIn PDF document text
    • http://www.iece.in/userfiles/file/xovab.pdfIn PDF document text
    • https://qamarapps.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8fc5e60a9d---65709800078.pdfIn PDF document text
    • https://partnyor.az/userfiles/file/4823080101.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/40771718579.pdfIn PDF document text
    • https://www.infrascale.com/wp-content/plugins/super-forms/uploads/php/files/04e02376ca0c8275ddf33bc9dd390fc6/57029486462.pdfIn PDF document text
    • http://sungwoneng.com/upfile_editor/2021/files/gipamenepinukovaxota.pdfIn PDF document text
    • http://hopkinshigh1961.com/clients/878968/File/tisaxewotibas.pdfIn PDF document text
    • http://swiss-ex.com/wininupovap.pdfIn PDF document text
    • http://thegioioto.store/upload/files/puvetoxexakerodobabapijum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=red+cabbage+carrot+slawPDF 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_off0000debf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D1 16632 bytes
SHA-256: a282f3c4135150a28494636302c94d08292cd93c7fba1c1f924519745a599c28
font_02_sfnt_off00012235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12235 10620 bytes
SHA-256: 1c138de46aa80dbcefe19e0d9f8240e1e6f6e6964f3fa221fcb6d630d8fe7340

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