Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3fd8335352d25e7…

MALICIOUS

PDF

70.9 KB Created: 2021-09-25 00:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 37e0dcfe19ff7344dfd4adae8f1ff349 SHA-1: 2f2d526d8f3af0e67c06f744ea07c513f6ee15b5 SHA-256: f3fd8335352d25e7c461907a16f2bec8660dec355e8faf97f6d99a6be754b3ef
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, distributing links across multiple disposable and compromised hosts. The embedded URLs, such as 'https://crysiq.ru/uplcv?utm_term=wwe+2k+2017+game+download+for+android', suggest a lure to download potentially unwanted or malicious software.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crysiq.ru/uplcv?utm_term=wwe+2k+2017+game+download+for+android PDF link annotation
    • https://coil.hk/upload/files/tofupinaraxoz.pdfIn PDF document text
    • http://nilesk.com/userfiles/file/zusedi.pdfIn PDF document text
    • http://vagtteam.dk/userfiles/Files/ruxuragigawuba.pdfIn PDF document text
    • https://upaspor.com/resimler/files/12588590396.pdfIn PDF document text
    • http://taaltoetsvo.nl/userfiles/file/62243236520.pdfIn PDF document text
    • https://motodubai.com/uploaded_images/files/57573181274.pdfIn PDF document text
    • http://purepassion.pl/userfiles/file/89432292162.pdfIn PDF document text
    • https://www.physioaktivkramer.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614900758ecb1---36551551869.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/34535297161.pdfIn PDF document text
    • http://grapes4u.ca/sites/all/sites/grapes4u.ca/files/76420125023.pdfIn PDF document text
    • https://philly.drinkpoint.com/uploads/files/pusutodogitomutaperobivo.pdfIn PDF document text
    • https://classconnbio.com/img-jacson/files/36603366089.pdfIn PDF document text
    • http://lawngo.net/fckfiles/votifirapewo.pdfIn PDF document text
    • https://perfecthospital.org/ckfinder/userfiles/files/42960582134.pdfIn PDF document text
    • https://adikketiga.com/contents/files/pipariwitoxupid.pdfIn PDF document text
    • http://mskabel.cz/UserFiles/File/pelexan.pdfIn PDF document text
    • http://akcjonariusz.com/UserFiles/file/79212270903.pdfIn PDF document text
    • http://trieuduong.com/images/Download/52637754322.pdfIn PDF document text
    • https://amartzon.store/wp-content/plugins/super-forms/uploads/php/files/8229e7279076fad4c3f11aedd199827d/ziwonuwabijunerasigovo.pdfIn PDF document text
    • http://xn--5dbfbdrd7azav1bcx.com/sites/default/files/file/pesadumijaworafilika.pdfIn PDF document text
    • http://dalboncostruzioni.it/userfiles/files/19432223216.pdfIn PDF document text
    • http://www.srijonihealinghome.com/fckimages/file/12203890946.pdfIn PDF document text
    • https://betonwerkendejonge.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16134e68b48968---48263151208.pdfIn PDF document text
    • http://poptheme.cn/uploadfile/files/20210908_061922.pdfIn PDF document text
    • https://hum639hb2-hh38.com/contents/files/35768572605.pdfIn PDF document text
    • https://regionalhealthprogramsww.com/images/file/99261102947.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_off0000b42f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB42F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cc46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC46 10948 bytes
SHA-256: 9166119b9cf3d89db8ffafdb1502d9a9ffab022c8b64400c5a3c36d295f9c2b1
font_02_sfnt_off0000e58b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58B 15016 bytes
SHA-256: c3e4203607f6c24320a3c2669436b3246677a6d33b11f59762b4d66db80edead

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