Malicious PDF — malware analysis report

Static analysis result for SHA-256 32bfc3b66845823d…

MALICIOUS

PDF

72.5 KB Created: 2021-09-10 23:14:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 1c1b5432d8dd72a2fea4c0e2cd6ff290 SHA-1: 3288888ffb34089bd5ee75dc36ecfa9fb8fb73aa SHA-256: 32bfc3b66845823d0d4c7022a251a58e86f6716230058ccb50c8f5fd29434942
156 Risk Score

Malware Insights

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

The PDF contains numerous links to compromised websites and link farms, indicating a phishing or malware distribution attempt. ClamAV and ML classifiers strongly indicate maliciousness. The file's structure and embedded URLs suggest it is used to redirect users to potentially harmful content, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://philabc.ru/uplcv?utm_term=iphone+6s+stuck+in+recovery+mode PDF link annotation
    • https://djennebeads.com/nbloom/fckuploads/file/62629659822.pdfIn PDF document text
    • http://careerhack.net/wp-content/plugins/formcraft/file-upload/server/content/files/161392376286ea---fisaxotowilezifonawe.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/16405773260.pdfIn PDF document text
    • http://optykglowacki.pl/obrazki/files/zekewikudusot.pdfIn PDF document text
    • http://instit.ac/ckfinder/userfiles/files/15567260626.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/fizuzes.pdfIn PDF document text
    • http://labradory.pl/file/xesexik.pdfIn PDF document text
    • http://adbuilder.at/ckfinder/userfiles/files/zozalale.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/12528093471.pdfIn PDF document text
    • http://melabo.com/upload/files/86540197374.pdfIn PDF document text
    • http://www.sandzthabapanel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1612f316aabef1---2879803235.pdfIn PDF document text
    • http://asalsold.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132f595e6c42---34503393709.pdfIn PDF document text
    • http://gianenricofabro.com/userfiles/files/83518304199.pdfIn PDF document text
    • http://bbdecontra.com/userfiles/files/45523131652.pdfIn PDF document text
    • http://fluorescent-training.com/file/35367243112.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161373b783c319---sujusozirerafubadaw.pdfIn PDF document text
    • http://upnbkk.com/file_media/file_image/file/ledidubobebizizevituno.pdfIn PDF document text
    • http://profitoolinfo.ru/ckfinder/userfiles/files/76981612149.pdfIn PDF document text
    • http://stavclearing.ru/upload/files/nifamataz.pdfIn PDF document text
    • https://www.indee-r.fr/wp-content/plugins/super-forms/uploads/php/files/6acb814a7bb8c7884eee46b4a79c05ee/vanon.pdfIn PDF document text
    • http://nenorm.com/files/files/37523616954.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/19163813347.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/mosiwodilaseninosik.pdfIn PDF document text
    • http://kanalizace-ul.cz/userfiles/file/naboborulividitoxuz.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_off0000b855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB855 16432 bytes
SHA-256: cab58d0696c97c06dbe1284cdf93852ea4181948aa859865a39399e2500901ec
font_01_sfnt_off0000e2bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 11064 bytes
SHA-256: 741cacc278560c93721cadac9491bf7c4f4cb1a6c795622a90e2dcd8a1f46794

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