Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bd7bfe0ee5623d0…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 06:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: eedc8c713361cd02eb6b98119b58481d SHA-1: 89688c8d1f25fd2e396aadda04ea7943fc8b7302 SHA-256: 9bd7bfe0ee5623d02b764408e645ff875c37b2956e764a0ece76144f8885900c
156 Risk Score

Malware Insights

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

The sample was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, pointing to multiple compromised CMS uploads and disposable hosting sites. The embedded URLs likely serve to redirect users to malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://cityfate.com/files/files/74626208927.pdf In PDF document text
    • http://www.altrus.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1614cb78055636---nifurosuk.pdfIn PDF document text
    • https://traffictkt.com/viking1/uploads/files/vomivivugele.pdfIn PDF document text
    • http://lamachine.nl/userfiles/file/49539512300.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/tewukomobudagorujososutab.pdfIn PDF document text
    • https://www.afoa.org.ar/backend/ckfinder/userfiles/files/wawuzezemexavesatumi.pdfIn PDF document text
    • http://195exim.com/datas/files/puvopa.pdfIn PDF document text
    • http://resortvillairene.it/userfiles/files/gadudalugubezej.pdfIn PDF document text
    • http://srtcivilnorth.com/ckeditor_file/files/5293067789.pdfIn PDF document text
    • https://gegeny.hu/uploads/file/datojifomadeworelakosuzul.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/61605606315.pdfIn PDF document text
    • http://niezapominajkowo.eu/userfiles/file/rejani.pdfIn PDF document text
    • http://yingtailong.com/upload/file/210907120017022963rgo97k9p8gxg.pdfIn PDF document text
    • https://asaptransfers.co.uk/wp-content/plugins/super-forms/uploads/php/files/2212d16097693f3b3663173fa8c4c197/wibiburorolukugu.pdfIn PDF document text
    • http://primaria-ciocirlia.ro/media/file/ruzixibivuxarek.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/foridipogibakujuzamenuvav.pdfIn PDF document text
    • http://surmounttravel.com/userfiles/files/86912184803.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/konozuxuluv.pdfIn PDF document text
    • http://back2wood.de/userfiles/file/62943197829.pdfIn PDF document text
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613fea8c922b3---gezebo.pdfIn PDF document text
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/161466dbfe30ad---81049642406.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/julifatusoxivefebewegis.pdfIn PDF document text
    • https://jsptti.com/ckeditor/ckfinder/userfiles/files/66757613476.pdfIn PDF document text
    • http://predit.ru/admin/ckfinder/userfiles/files/80173991111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=python+flask+android+appPDF 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_off0000b125.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB125 10668 bytes
SHA-256: 31dc33458db0b02941f823b0a06928b199a8df26e121328427a01472d9e7e445
font_01_sfnt_off0000c985.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC985 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e197.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE197 15888 bytes
SHA-256: c42dec9b65bb0221449a3b3049fa7508677eb0458523621a3f055d2ca0af425e

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