Malicious PDF — malware analysis report

Static analysis result for SHA-256 33c00c4f524093c4…

MALICIOUS

PDF

80.4 KB Created: 2021-09-22 14:49:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e2bca81301073d76fa4df4cadb277f1b SHA-1: 683ae3569dec8a90461aaf463e54b14425f38ce7 SHA-256: 33c00c4f524093c4871abc3469eeffaf490c3e32d775bdbfd82a65ccededf65b
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The embedded JavaScript likely facilitates the redirection or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://garglob.ru/uplcv?utm_term=filmorago+pro+no+watermark+for+pc PDF link annotation
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/161342ce844088---90961113134.pdfIn PDF document text
    • https://searches.onlineconvey.com/userfiles/file/58268143834.pdfIn PDF document text
    • http://ecosdaliberdade.com/ckfinder/userfiles/files/falupinedekufezoluv.pdfIn PDF document text
    • https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613256af12509---92152911779.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16134dd6887118---15654595457.pdfIn PDF document text
    • http://pcserviszlin.cz/ckfinder/userfiles/files/20030814531.pdfIn PDF document text
    • http://dpholding.ru/uploads/files/duvasudukajivor.pdfIn PDF document text
    • http://fabriquetextil.com/js/new/fckeditor/userfiles/file/jofesoxifavijuxo.pdfIn PDF document text
    • https://khoahoc.timviec365.com/picturesfiles/53918463347.pdfIn PDF document text
    • http://jd6618.com/jd6618/file/2021-9/file/LwpCms2021_09_16_19_16_14_7233.pdfIn PDF document text
    • http://www.canadiantreasurer.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350900dd126---zamafuke.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/86921856230.pdfIn PDF document text
    • https://goodmix-psc.com/userfiles/files/xigozejugojipevoriveban.pdfIn PDF document text
    • http://veterina-naslunci.cz/userfiles/file/lurupurulixuterune.pdfIn PDF document text
    • https://www.syria-report.com/sites/all/libraries/ckfinder/userfiles/files/42611781146.pdfIn PDF document text
    • https://nikoljski.com/ckfinder/userfiles/files/85637182794.pdfIn PDF document text
    • https://lensprovn.com/ckfinder/userfiles/files/16840134949.pdfIn PDF document text
    • https://funke.be/data/file/joluwebebezefap.pdfIn PDF document text
    • http://zadonskiy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae7169b552---wevigezavafudo.pdfIn PDF document text
    • https://maxflowfans.com/userfiles/file/xadunanuru.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/jamotuwikugajure.pdfIn PDF document text
    • https://stw-nowogard.pl/download/file/gufawulifavonobija.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_off0000d3ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3EC 18016 bytes
SHA-256: a2d7995e22ee3e86f5c32d6074f0a998f8aa9428a4d5cc8b5b071613ccba9ede
font_01_sfnt_off000102b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC9 10812 bytes
SHA-256: 0a77cf905d81936bbb338495fd8e065b953e359492a008138327635445959792

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