Malicious PDF — malware analysis report

Static analysis result for SHA-256 6edbde5775432633…

MALICIOUS

PDF

82.2 KB Created: 2021-09-14 01:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 18cf0c8f25cdbbdb1bc9e78becd343e4 SHA-1: 819630e9a999d1c21f80dcbea3613a47523ffc8f SHA-256: 6edbde57754326331e7ef90bd5add8d52b439c1823e26d4edd58771b7f8bc942
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF document identified as malicious by ML classifiers and ClamAV. It contains a large number of embedded URLs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of external URIs and link farms indicates an attempt to distribute further malicious content or phish for information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://allytemp.ru/uplcv?utm_term=navigation+bar+settings+android PDF link annotation
    • http://gardensyellowcab.com/admin/images/file/nulufujovifuterasunu.pdfIn PDF document text
    • http://camelliafb.com/uploads/files/202109021322317332.pdfIn PDF document text
    • http://pharmabiosolutions.com/filespath/files/20210906041621.pdfIn PDF document text
    • http://airfa.it/userfiles/file/ramamov.pdfIn PDF document text
    • http://sys-svinding.dk/userfiles/file/2396227452.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/25026644128.pdfIn PDF document text
    • https://uzsienis.cvzona.lt/resources/img/files/99568130614.pdfIn PDF document text
    • http://www.integra-cr.cz/administrace/ckfinder/userfiles/files/10075347741.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb08f446bc---32236002107.pdfIn PDF document text
    • https://www.isgs.org/wp-content/plugins/super-forms/uploads/php/files/0324f25fc6f5f1b55cfb5fd673c22501/18165507548.pdfIn PDF document text
    • http://www.rebranded.tv/wp-content/plugins/formcraft/file-upload/server/content/files/1612f987120f95---34309745426.pdfIn PDF document text
    • http://cambridgekapurthala.com/damana/userfiles/file/26844166734.pdfIn PDF document text
    • http://motivationandmomentum.net/ci/userfiles/files/81081768788.pdfIn PDF document text
    • https://doublehair.center/upload/ckfinder/files/31014149343.pdfIn PDF document text
    • https://terracell.info/images/file/jididebamigadasogubomave.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/migagokiwafalarukukaj.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/93951790077.pdfIn PDF document text
    • http://bm-shower.com/userfiles/files/kogikujatosa.pdfIn PDF document text
    • https://xn--80aaijz0c.xn--p1ai/ckfinder/userfiles/files/10872626898.pdfIn PDF document text
    • https://betenrealestate.com/sites/default/files/file/13726369410.pdfIn PDF document text
    • http://neza.cz/UserFiles/File/nifenegab.pdfIn PDF document text
    • http://jilienjrubin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kemobaduresewasenesipowaw.pdfIn PDF document text
    • http://mas.vacations/wp-content/plugins/formcraft/file-upload/server/content/files/1613d00b997432---neterena.pdfIn PDF document text
    • https://medicabg.com/uploads/wysiwyg/files/71969769881.pdfIn PDF document text
    • http://studioagronomoserragiotto.eu/userfiles/files/dapilupomuta.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/tebebiwupazade.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcf6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF6 17808 bytes
SHA-256: ff6ff302d48858d4a2553f4406f70942cdaa80348fdc5a5cb1cb3eac996d5de3
font_01_sfnt_off00010acd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ACD 10560 bytes
SHA-256: 7a42970c74d20839aac54e779467798e35ebac42ea9702c2e9f4e695da580b31
font_02_sfnt_off000122db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122DB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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