Malicious PDF — malware analysis report

Static analysis result for SHA-256 8050d163027f1ff9…

MALICIOUS

PDF

91.6 KB Created: 2021-09-05 07:36:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4b59156b784daeffd6b78f4af91cbc24 SHA-1: 0ecac4fd54143225931d4b2dd509fb1963570fa7 SHA-256: 8050d163027f1ff95b523eabc02c6ec4bbf9d66f7973dcbd55201d0bf0b2cd63
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external resources, many hosted on compromised or disposable domains, suggesting a phishing or credential harvesting attempt. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic indicates the document likely provides instructions to decrypt a password-protected archive, a common tactic to evade gateway security. While no scripts were explicitly extracted, the ML classifier and ClamAV detection strongly suggest malicious intent, likely involving the download and execution of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://garglob.ru/uplcv?utm_term=how+do+i+unprotect+a+password+protected+worksheet+in+excel PDF link annotation
    • http://chnli.tw/CKEdit/upload/files/27367896137.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/49489867860d68351c3836.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/tetetavukagebositus.pdfIn PDF document text
    • https://www.euroservicemilano.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607417693c802---sisanejevev.pdfIn PDF document text
    • https://eclipsetheaters.com/wp-content/plugins/formcraft/file-upload/server/content/files/16071e59a6fae4---fevemuwepezezuzejep.pdfIn PDF document text
    • https://moto-trend.cz/public/files/fck/file/51055283721.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/15170220929.pdfIn PDF document text
    • http://zonwering-nederland.eu/ckfinder/userfiles/files/piwen.pdfIn PDF document text
    • http://beamstraffic.ae/amb/userfiles/file/98746480885.pdfIn PDF document text
    • http://jakpaisanestate.com/images/upload/files/lufuneg.pdfIn PDF document text
    • http://sushistoryus.com/uploads/files/59988050782.pdfIn PDF document text
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/8c3f93ff8159001470f2de84ee46a17a/81375436981.pdfIn PDF document text
    • http://jnnycc.org/userfiles/file/60050787239.pdfIn PDF document text
    • http://investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/62753099118.pdfIn PDF document text
    • http://guidesdugrandlarge.fr/images/import/file/5654029409.pdfIn PDF document text
    • https://clubslotalmatriche.com/calcas/file/6944666984.pdfIn PDF document text
    • https://holcom-wd.holcom.vn/webroot/img/files/60763859917.pdfIn PDF document text
    • http://xn--9i1b14l32gg2dsybq3b.com/upload/fckeditor/file/wapamakonuz.pdfIn PDF document text
    • https://aguiapromocional.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16089b3c972966---komirusazomus.pdfIn PDF document text
    • https://kenkochaya.com/user_data/ckfinder/files/91910369986.pdfIn PDF document text
    • http://quickvideo.nl/userfiles/file/jobez.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7c317e0b7b---gebaforekujo.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_off0000fe38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE38 10984 bytes
SHA-256: 70d0fdc0e7edb1dd2dcb21e222d6c57a2285678ec38ce4ba6e985a248b8135be
font_01_sfnt_off000117af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012fc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FC1 18832 bytes
SHA-256: 54542ad1ef79fb6031e14d08745c6f8a20f1b0119dc09006a88f315cd3728682

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