Malicious PDF — malware analysis report

Static analysis result for SHA-256 e746a16ba9048d71…

MALICIOUS

PDF

74.3 KB Created: 2021-09-05 04:13:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: c6047bf27109a75fc2ade9db4ea85826 SHA-1: a5b0a359c2dd43856fc17bab07bf126868a41e63 SHA-256: e746a16ba9048d7147b95e025ccd783496c6fe0c1eced5ca48cddbf0f104e10d
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised CMS uploads or disposable hosting, indicating a link farm designed to obscure the ultimate destination. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the structure and URL patterns strongly suggest a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://tavaszitura.eu/userfiles/files/83882514973.pdf In PDF document text
    • http://vektorma.ru/uploads/assets/file/98220377629.pdfIn PDF document text
    • https://loctra.net/userfiles/file/luzofajalojen.pdfIn PDF document text
    • http://global-leasing-management.com/uf/file/gosogakeb.pdfIn PDF document text
    • https://plentis.eu/ckfinder/userfiles/files/rojokoxixakasoduj.pdfIn PDF document text
    • https://nobleanimalsanctuary.org/wp-content/plugins/super-forms/uploads/php/files/tmp/kipizunudibavisafimota.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/160ba932aeefc4---96688675833.pdfIn PDF document text
    • https://shreenathtechnologies.com/userfiles/file/komirelefipu.pdfIn PDF document text
    • https://sevsport.info/wp-content/plugins/super-forms/uploads/php/files/eab4b921fda04a1d87933e7704cce1e4/godogubodefakasuril.pdfIn PDF document text
    • http://eventclub.pl/userfiles/file/29102190814.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/96298181742.pdfIn PDF document text
    • https://medicinasolidale.org/wp-content/plugins/super-forms/uploads/php/files/38e8f59b681e31761b6614440e364f04/soripebevema.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/732e0034685c6362b5a12c0bc4cf04f7/xuzozosikavuborin.pdfIn PDF document text
    • http://gf-location.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16080059c98cf8---kazavikotuwi.pdfIn PDF document text
    • https://xn--i1aam8cb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/c2363adbca29b106b80c3a6bd91a1248/numokijosubo.pdfIn PDF document text
    • https://aimtronu.org/userfiles/file/zukisotelab.pdfIn PDF document text
    • https://nothingbutsafetyglasses.com/userfiles/file/95853440581.pdfIn PDF document text
    • http://associacaoguainumbi.org.br/wp/wp-content/plugins/formcraft/file-upload/server/content/files/160983e6a2d468---dibanawisu.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613274d9af33c---84564988740.pdfIn PDF document text
    • https://stakeoutllc.com/wp-content/plugins/super-forms/uploads/php/files/7322c74c99eebbc3d82ca0e4ec5bd34c/84596051326.pdfIn PDF document text
    • https://culturasiapamplona.com/guiarte_userfiles/files/lapamumugolaraxavu.pdfIn PDF document text
    • http://pck.malopolska.pl/wp-content/plugins/super-forms/uploads/php/files/757bac3c15e558773bf867cf9a233524/valep.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/sizum.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=2018+jaguar+f+type+owners+manualPDF 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_off0000bd82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD82 11444 bytes
SHA-256: aa89059c24104ee90acaca996033baee346f0ba272e8251e2ec5538b27ce815d
font_01_sfnt_off0000d8c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f0da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0DA 16600 bytes
SHA-256: 335a2d3c615bb70050944b358449c198263b72eb330582d46cfb50c7bed14848

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