Malicious PDF — malware analysis report

Static analysis result for SHA-256 b397e077cda331b1…

MALICIOUS

PDF

91.3 KB Created: 2021-07-06 09:52:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14e240d8cc3eb54b25475e5f540b4bc7 SHA-1: 1e05b552e7abafa8a3dac882f1aec74e4420c309 SHA-256: b397e077cda331b1c0ae31e05017324a462f60b67b453befa4392c154f619e5e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to various URLs hosted on compromised CMS uploads and disposable domains. While no scripts were explicitly extracted, the PDF structure and link farm behavior suggest an attempt to lure users to external sites, likely for phishing or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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 https://huntic.ru/uplcv?utm_term=boylestad+introductory+circuit+analysis PDF link annotation
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160746b84ddcc9---62179434765.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/93927204095.pdfIn PDF document text
    • http://turagent007.ru/userfiles/file/33920394612.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/9pqjb79d9igpgp8ht2dr83epb4/fuzore.pdfIn PDF document text
    • http://mixmarketing.vn/upload/fck/file/mozukadunev.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090077986baa---12695765037.pdfIn PDF document text
    • https://vetranhtuongmamnon.vn/wp-content/plugins/super-forms/uploads/php/files/6fpfm7gnsigfp8s5mcn3j26frg/forufamipavov.pdfIn PDF document text
    • http://onlinemidias.com/ckfinder/userfiles/files/92596969102.pdfIn PDF document text
    • https://lightupalife.org.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16082468bddd1c---vuxumol.pdfIn PDF document text
    • http://www.putnamtaxi.net/wp-content/plugins/formcraft/file-upload/server/content/files/160749e6a0f61e---47972240963.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073cb86683d2---mesovoxegakiku.pdfIn PDF document text
    • http://askort.pl/Upload/file/74023336670.pdfIn PDF document text
    • https://mumegram.com/userfiles/file/81011565228.pdfIn PDF document text
    • https://www.sblending.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160753431db714---36497816577.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/c7a76ab6b737c071b52ba56c3e4611e0/joreguvijeripusixuj.pdfIn PDF document text
    • http://animalscipublisher.com/files/upfiles/file/tujijor.pdfIn PDF document text
    • http://pamat.ro/UserFiles/file/47198242526.pdfIn PDF document text
    • http://thuduchouse.vn/pics/file/ledememaxanesapexitor.pdfIn PDF document text
    • http://beerskiboot.com/img/upload/file/vovajibateme.pdfIn PDF document text
    • https://kassa-evotor.ru/wp-content/plugins/super-forms/uploads/php/files/8mhj971rvoc2n66sskbbt5hlc9/mafuwupiweg.pdfIn PDF document text
    • http://techbis.pl/files/file/25034592882.pdfIn PDF document text
    • https://fastcomputer.vn/wp-content/plugins/super-forms/uploads/php/files/712072584b03674d351bdebc673b4048/9972029839.pdfIn PDF document text
    • http://gialtour.it/themes/userfiles//files/50431672825.pdfIn PDF document text
    • http://fsanaq.com/upload/file/210624195739718751809g09omv8ne.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A6 16552 bytes
SHA-256: 7576dc3503b6b292a7f74a2b07db5c25a0589d9eaf7883e70a05dade4f256811
font_01_sfnt_off0000fe9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE9E 19388 bytes
SHA-256: 2d4b284054e9ff470b2ecfaea74ec0a988925883fa1a43195f0df88d68ac7150
font_02_sfnt_off00012ee0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE0 10632 bytes
SHA-256: 93ff4b5a9d28b952a85ba90bd2b05a4c2c65772839b968d98bbddae2e934ce5b
font_03_sfnt_off00014766.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14766 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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