Malicious PDF — malware analysis report

Static analysis result for SHA-256 896215a9dccbde8d…

MALICIOUS

PDF

83.4 KB Created: 2021-09-01 03:34:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 6e36626b3564a12a22056ee9f44c2371 SHA-1: 0399ab0c7260b5cccbaf209d5861c19d061d6978 SHA-256: 896215a9dccbde8dc1f25373e46c332b07cf21b43fe1b09521538569e1f9a4b8
156 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. Heuristics indicate it functions as a link farm, directing users to multiple potentially compromised or disposable hosting sites. The presence of numerous PDF_SEO_DISPOSABLE_LINK_FARM and PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM firings strongly suggests a phishing or malware distribution attempt, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9833

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.farmaciavictoriayjmleon.com/userfiles/files/lobisijevopuvumejunuz.pdf In PDF document text
    • https://mithermomix.com.mx/wp-content/plugins/super-forms/uploads/php/files/f58b7efae1849226ba48af26932d1a03/kuwurijamibezimexelove.pdfIn PDF document text
    • https://oknoplus-omsk.ru/wp-content/plugins/super-forms/uploads/php/files/cc3ddb2a56936e3224c1c956308e8412/jatotamovudunizedumeb.pdfIn PDF document text
    • http://www.next-conseil.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160b732a83e2c6---48176086895.pdfIn PDF document text
    • http://dlikefulproductions.com/clients/875850/File/luzavekodejonuti.pdfIn PDF document text
    • http://martonaroniskola.net/userfiles/file/rateforexorebikuzuxigek.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/24863224370.pdfIn PDF document text
    • http://pspectr.ru/userfiles/file/mobopi.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d5a0b9a3103---folujokitodekebipalobepa.pdfIn PDF document text
    • http://mountmedpharmacy.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160e64ae17ed51---nelujupagozo.pdfIn PDF document text
    • http://yao-cheng.com/uploadfiles/20210817162731.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/jamerafet.pdfIn PDF document text
    • https://alphaveneers.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6ae09c85bd2be569bf940bf48b73250/41794808424.pdfIn PDF document text
    • https://realimpacto.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606fcf28536a8---jifekimur.pdfIn PDF document text
    • https://mobilityservices.it/file/widovavowotopenimuwopojot.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/rosozititotefijerisuk.pdfIn PDF document text
    • http://ghalemdi.com/userfiles/file/lijurarodinuzeso.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/85ivbsi00utcl28dk82lff784v/suvot.pdfIn PDF document text
    • https://toromecanicorodeo.com/files/32844251372.pdfIn PDF document text
    • http://www.bridalchapel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a72fb3f07be---9950941023.pdfIn PDF document text
    • http://wsystem.sk/userfiles/files/mupizi.pdfIn PDF document text
    • http://2ds-creations.fr/userfiles/file/44654345682.pdfIn PDF document text
    • https://alcc.vn/wp-content/plugins/super-forms/uploads/php/files/4kgujmcut3bns6m30mdmivcfkq/59150435880.pdfIn PDF document text
    • https://sodigital.it/wp-content/plugins/formcraft/file-upload/server/content/files/160e9148c7ae31---79991116545.pdfIn PDF document text
    • https://kawanmto.info/contents//files/peritiwejonawuma.pdfIn PDF document text
    • https://prastosten.se/anvandarbilder/95/files/39779877994.pdfIn PDF document text
    • http://drxzhang.com/userfiles/file/1610023928.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=using+the+periodic+table+complete+the+table+to+describe+each+atomPDF 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_off0000defa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f70c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF70C 18256 bytes
SHA-256: 70c6b8a7b8fd94e88013135216f7c2d27125302df1b11514e21738d990a95bd3
font_02_sfnt_off00012644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12644 11108 bytes
SHA-256: aadfad6e08fdf0e915720ff2fbae31e9a1f6e74fb7795ebb4270b9d8b692a63e

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