Malicious PDF — malware analysis report

Static analysis result for SHA-256 96138b79343ac44c…

MALICIOUS

PDF

125.1 KB Created: 2021-07-16 03:04:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 154b47716def16927b86c285a1acdd58 SHA-1: eaa251d6e5f223e4c71ee3138666f551d540e433 SHA-256: 96138b79343ac44cdadda17bfc2389d8081bf950a6d733efba980875c8672dd7
156 Risk Score

Malware Insights

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

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous links to compromised websites, indicating a link farm or phishing lure. The presence of these links suggests the PDF is intended to redirect users to malicious content, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://www.cascinasorigherio.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607cff6b91528---xelowarebokikezuvuzawalob.pdf In PDF document text
    • https://implantsdentairesdesmoulins.com/upload/editor/file/68768422877.pdfIn PDF document text
    • https://noddy.nu/images/file/tawofelorebifuzonebeda.pdfIn PDF document text
    • https://contact-house.com/fckeditor/upload/file/38276362376.pdfIn PDF document text
    • http://jjkxmy.com/upload/files/202107080044429794.pdfIn PDF document text
    • http://amandatravel.com/userfiles/file/25548782581.pdfIn PDF document text
    • https://www.infratechgroep.nl/wp-content/plugins/super-forms/uploads/php/files/4a4f560e1a2fab6e288a27c470facb0e/wejilamesukifo.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/mukenoponofivesuvufal.pdfIn PDF document text
    • https://www.avenueroadadvertising.com/wp-content/plugins/formcraft/file-upload/server/content/files/16088eecf46acd---2412504963.pdfIn PDF document text
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/16082f4e1c164f---78211787779.pdfIn PDF document text
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b31ab41c3d8---wapala.pdfIn PDF document text
    • https://cvenhancer.com/wp-content/plugins/super-forms/uploads/php/files/56315e7a26aa87634f86a04686127e78/95029201156.pdfIn PDF document text
    • http://amadpich.com/userfiles/file/10978843663.pdfIn PDF document text
    • http://greenlivinggarden.com/htdocs/UserFiles/file/lepokotato.pdfIn PDF document text
    • http://danguykhoidoanhnghiephp.vn/Upload/files/rerupubotelukun.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/df2e9fc4d040d41ae33e549689e29bf0/kanefefeme.pdfIn PDF document text
    • http://stalmont.eu/userfiles/file/96705816936.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c406ab49fa5---51278268690.pdfIn PDF document text
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/ae88b883284a2160f8733e4a17ece5b3/wolizon.pdfIn PDF document text
    • http://comp-art.ru/userfiles/file/tunuboweri.pdfIn PDF document text
    • https://baobihungphu.com/media/ftp/file/jenifemedovevukogevet.pdfIn PDF document text
    • https://ecoinkworld.com/wp-content/plugins/super-forms/uploads/php/files/a0a732787f9bc5d1512c8680d6f3c3ad/6934005185.pdfIn PDF document text
    • http://safeabortionnepal.com/userfiles/file/14068456989.pdfIn PDF document text
    • https://www.allterra.group/wp-content/plugins/super-forms/uploads/php/files/2ea7de58bccc3766aa5b8c61ad19bc34/rakimobojozodovoxoli.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/S30rS-6n6vg/uplcv?utm_term=condolence+message+on+death+of+my+motherPDF 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_off00018b16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18B16 16568 bytes
SHA-256: a0ab35d7f8e805e926e18123f70364dadc9d6037719a493e048f100b59544655
font_01_sfnt_off0001b57e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B57E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001cd95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1CD95 10976 bytes
SHA-256: 19dcc5f522c7ca8535e57e88f065fc62eba0728720f5fac9ea943ee7fe2fb7d2

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