Malicious PDF — malware analysis report

Static analysis result for SHA-256 319952b84d78ebc9…

MALICIOUS

PDF

80.1 KB Created: 2021-10-17 21:42:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: c4f401b989da07012536f8794c3f08e4 SHA-1: af1f4ce77a5af1c16f9c1dfbfb52aafda6a5ea82 SHA-256: 319952b84d78ebc98f17d0941b957da26e8a83b581e221e4419a56918e5ed790
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating it likely contains a malicious payload. The 'SE_ENABLE_LURE' heuristic suggests the document is designed to trick the user into enabling macros or editing, which is a common initial step for malware execution. The presence of numerous external links, some pointing to compromised CMS uploads and disposable hosting, further supports a malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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.
  • Macro/content-enable lure medium SE_ENABLE_LURE
    Document instructs the user to enable macros or editing — a common technique used by malware droppers to bypass Office macro security settings
  • 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://crewmak.ru/uplcv?utm_term=turn+word+document+into+fillable+pdf PDF link annotation
    • http://argol-editions.fr/userfiles/file/zojipalozexadasagolizib.pdfIn PDF document text
    • http://beiks.info/public/file/8830168412.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/zatomalexe.pdfIn PDF document text
    • http://noithatphathuy.com/Images_upload/files/nulumamusalivupuke.pdfIn PDF document text
    • https://virtualpulse.eu/UserFiles/file/4383915043.pdfIn PDF document text
    • http://pentas.eu/userfiles/file/fedufuze.pdfIn PDF document text
    • https://ultralloy.net/upload/files/nagibeves.pdfIn PDF document text
    • https://xehowo24h.com/images/ckeditor/files/23822446488.pdfIn PDF document text
    • http://myphamso1.net/uploads/files/darumipegadavelosajoxez.pdfIn PDF document text
    • http://canxetaidientu.com/images/file/72336844401.pdfIn PDF document text
    • https://principesgs.com/userfiles/file/fotubotewida.pdfIn PDF document text
    • https://data-face.noithattoantam.vn/userfiles/file/dipogemijamigulobi.pdfIn PDF document text
    • http://zhengfutz.com/v15/Upload/file/202110422617108.pdfIn PDF document text
    • http://www.gametimecatering.com/wp-content/plugins/formcraft/file-upload/server/content/files/16161d28b869db---supewa.pdfIn PDF document text
    • http://farmaciacogliate.it/userfiles/files/55727633282.pdfIn PDF document text
    • https://ddriu.hu/wp-content/plugins/super-forms/uploads/php/files/9236a4841233366668d8bca3c86038c8/71960602122.pdfIn PDF document text
    • https://qwert5.com/psum/admin/userfiles/file/41270481675.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/23559490733.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130df44cf811---90096354726.pdfIn PDF document text
    • https://ozora.schaffsen.com/contents/file/61380626656.pdfIn PDF document text
    • https://perfecthospitals.com/FCKeditor/file/13438187354.pdfIn PDF document text
    • https://firstview.christoff-design.com/files/88597465198.pdfIn PDF document text
    • https://labelmarket.eu/data/file/rapiwilotiwagoz.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/34678469361.pdfIn PDF document text
    • http://problemconsulting.com/img/download/files/kileg.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_off0000d562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD562 10900 bytes
SHA-256: dd406698f3123ab0b52e3e44f999ee2b957d091b7299084fc18368a456ca70af
font_01_sfnt_off0000ee65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE65 17000 bytes
SHA-256: b39896044d9c02061df5d5b389d1277d411cf4fe3e17cb4c2fafce3b2226082c
font_02_sfnt_off00011a67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A67 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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