Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e309add03c29f93…

MALICIOUS

PDF

89.1 KB Created: 2021-08-10 22:26:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 9b5f76c8caf882ee659ff12424b10406 SHA-1: fd0ec3e18c6a431d7b2e4b1a7f628bbc27670c40 SHA-256: 1e309add03c29f93994438937c4079780303bf338d17e5fba8512090fc4368bb
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links pointing to compromised WordPress upload directories and disposable hosting, suggesting a link farm used for phishing or malware distribution. The PDF structure itself does not contain readable content, but the presence of external links and the overall detection profile strongly suggest it's part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

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 http://paramountswimwear.com/userfiles/files/33406332614.pdf In PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/16087df2d7b2ff---82731512209.pdfIn PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/80514852560.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608d6eb0b0233---20839307625.pdfIn PDF document text
    • https://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1608711b32963a---11116559947.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/sukukudetawunuxetina.pdfIn PDF document text
    • http://st-ark.it/userfiles/files/2420601563.pdfIn PDF document text
    • http://www.virtualaid.eu/wp-content/plugins/formcraft/file-upload/server/content/files/1606c9c2fe31ea---gufulaselajufuv.pdfIn PDF document text
    • http://penoplex24.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a81d2c9118c---93052778338.pdfIn PDF document text
    • https://avis-medical.ma/wp-content/plugins/super-forms/uploads/php/files/1d146dff4c2372be567e0d6364230417/60108807597.pdfIn PDF document text
    • https://www.mercato.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160884ab1d0278---lidep.pdfIn PDF document text
    • http://drvision.org/wp-content/plugins/formcraft/file-upload/server/content/files/160965656547d7---17981860765.pdfIn PDF document text
    • http://melinterior.ru/userfiles/files/runotapo.pdfIn PDF document text
    • https://sportli.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/160830d098fd4b---vawofubero.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/e7g8dev8p755jgd5hhourfpbn1/gufefuravol.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609e94ab761c9---fabunemuvegepe.pdfIn PDF document text
    • http://robinsonsmithreunion.com/clients/879094/File/xajepokena.pdfIn PDF document text
    • http://esipro.fr/userfiles/file/watosematatirokis.pdfIn PDF document text
    • https://lakeshoresmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/t6b91o50vnmhuno1vh10n7vkd6/96326714239.pdfIn PDF document text
    • https://bhandarisurgical.com/ckfinder/userfiles/files/88223058561.pdfIn PDF document text
    • http://yksskj.com/ckfinder/userfiles/files/malubidavezukojaxanesezil.pdfIn PDF document text
    • http://www.kreasoft.mx/wp-content/plugins/formcraft/file-upload/server/content/files/1609f84dcb9552---35827875699.pdfIn PDF document text
    • http://sip7.online/wp-content/plugins/super-forms/uploads/php/files/23e2cfa1f79c08ed687380b31b406b46/lojujasekujaved.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/bakewajufifigos.pdfIn PDF document text
    • https://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/3ab1c7989cd91c48681de542fb6e4126/semodanup.pdfIn PDF document text
    • https://sedefartphotography.com/resimler/files/14327224248.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=macbeth+act+3+scene+6+discussion+questionsPDF 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_off0000f818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF818 16712 bytes
SHA-256: f574fd7a9aa571230ba734698ebdae5b4822e6d86ca44252e0f4dbcfdd7c3b45
font_01_sfnt_off0001238f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1238F 11040 bytes
SHA-256: cfc2332fb21e87668f1e81cd59811be8be6127b579442d0a2ca53494d713f2f9
font_02_sfnt_off00013d12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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