Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f5de3a007802fe9…

MALICIOUS

PDF

74.8 KB Created: 2021-09-17 18:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: e7e1a1b62740a6ca015f7f4e22fd2a3e SHA-1: 4c1c016233b4137b6a358308bd6f9a63d9790fcc SHA-256: 0f5de3a007802fe97b2e0544e19f94a8d31770d427dd05909d66115c1bc149f6
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, indicating a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. The embedded JavaScript likely facilitates the redirection to these external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://inwebjor.ru/uplcv?utm_term=secrets+of+the+alpha+male+pdf PDF link annotation
    • https://cfaegaianascente.pt/portal/userfiles/files/99099699569.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16136e52b10b5b---bozebarupagij.pdfIn PDF document text
    • https://billionbosses.com/ckfinder/userfiles/files/50633667056.pdfIn PDF document text
    • https://theipbuzz.com/images/file/lebiferiturunesex.pdfIn PDF document text
    • http://erainbowrealty.com/userfiles/file/gudotomiratipug.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141acb50a9b9---xudoxaxi.pdfIn PDF document text
    • https://zerling.eu/nico/images/files/gawujupewexu.pdfIn PDF document text
    • http://bkdesign.ee/userfiles/file/81223013045.pdfIn PDF document text
    • http://saatgaamkansarasamaj.com/admin/uploads/files/gosagesig.pdfIn PDF document text
    • http://magic-mugs-factory.com/uploadfile/files/sirivorukidanokeritep.pdfIn PDF document text
    • https://ver9.sonikgps.com/ckfinder/userfiles/files/57535635338.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/wofezodadekafezekajubepud.pdfIn PDF document text
    • http://yavuzselimvakfi.org/resimler/site/files/55515897040.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/lukerasolafofufuva.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/953c9bbe7aa8f43de4f4cb6ac39e0938/bawejipavisemum.pdfIn PDF document text
    • https://vsetinrally.cz/userfiles/file/96348768466.pdfIn PDF document text
    • https://ietc-oman.saktoon.com/userfiles/files/gozofose.pdfIn PDF document text
    • https://curewelldiabetes.com/userfiles/file/7961550284.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/dizigetik.pdfIn PDF document text
    • https://bursakaynak.com/userfiles/file/lutez.pdfIn PDF document text
    • http://www.azurwelcomeservices.com/userfiles/file/87003143015.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/56171538964.pdfIn PDF document text
    • http://gesundheit-im-blog.de/userfiles/file/fujibabowape.pdfIn PDF document text
    • https://www.potravinyav21.cz/ckfinder/userfiles/files/74960691220.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_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 17356 bytes
SHA-256: 9fe52dd316ac04f47e7d247186f837ddc5747df6a021265935aacc9c96d470fe
font_01_sfnt_off0000ecd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD2 10764 bytes
SHA-256: 623aec651d872c5d226af23e7c23ed1beb90abc8c71594c23ad0fd2b2509d31c
font_02_sfnt_off0001059b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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