Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d62a5af821fc5aa…

MALICIOUS

PDF

70.0 KB Created: 2021-09-29 06:10:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 8c3eb12c5d0c714332148fe441f44521 SHA-1: 9f8b11a6c332775c4fd7142751505878de0f0c5e SHA-256: 4d62a5af821fc5aa5830cc6c9ddc3f8393381a8374f7c27fd91be8dd9035442c
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to lure users to potentially malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

Heuristics 6

  • 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.
  • 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=follovery+free+followers PDF link annotation
    • http://jcsh.bluezp.com/ckfinder/userfiles/files/zubajipududejinogusomele.pdfIn PDF document text
    • http://hiniceshine.com/upload/zojotudefejekabukoligi.pdfIn PDF document text
    • https://www.bevillelecomte.com/ckfinder/userfiles/files/56460175546.pdfIn PDF document text
    • https://akvanova.ru/sites/default/files/66681716058.pdfIn PDF document text
    • https://duext.com/wp-content/plugins/super-forms/uploads/php/files/aa0da0b4e5cba3e05e26147a9c8eea46/wubuxugimiwagumifoj.pdfIn PDF document text
    • https://kemxoithanhhang.vn/app/webroot/files/images/pages/files/73758255362.pdfIn PDF document text
    • https://pokereshop.cz/data/file/leginitirodivizogigepimi.pdfIn PDF document text
    • http://chizclean.ru/files/fck/file/67103503845.pdfIn PDF document text
    • http://adriennemason.com/assets/files/futanenex.pdfIn PDF document text
    • http://chrisdepanneservices.com/Sites/cds/files/51946101277.pdfIn PDF document text
    • https://hk-delight.com/UploadFiles/file/76534862202.pdfIn PDF document text
    • http://www.farmaciavictoriayjmleon.com/userfiles/files/87748114353.pdfIn PDF document text
    • https://www.traveltimevipp.com/wp-content/plugins/super-forms/uploads/php/files/d159e3105740489fcc952c26659a8563/kotulewojaweper.pdfIn PDF document text
    • https://keongracun.org/contents/files/wubabumiweb.pdfIn PDF document text
    • https://safetypadlocks.eu/eurostyl/photos/file/winivalojabonafisoverom.pdfIn PDF document text
    • http://www.ks-klinika.ru/ckfinder/userfiles/files/75810011729.pdfIn PDF document text
    • http://sanmorales.es/userfiles/files/tebaniwuvejadutodaravi.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/96056500260.pdfIn PDF document text
    • https://bankubezpieczen.pl/userfiles/file/wuxosexafu.pdfIn PDF document text
    • https://flylights.pl/wp-content/plugins/super-forms/uploads/php/files/kqvk6b2ne7lurqhuvdrec2bpi6/jinuxoxikomuj.pdfIn PDF document text
    • https://renfrewareahealthvillage.ca/ckfinder/userfiles/files/13941297090.pdfIn PDF document text
    • http://surausa.com/uploads/files/52673382829.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_off0000af48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF48 9996 bytes
SHA-256: 4d1a78e96a2c99048fb39d0a411afd717f63847e018606cbec8f44bd53751a98
font_01_sfnt_off0000c5a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 17144 bytes
SHA-256: ee69d1c66b67df0116aca0c1a71672d8c2892342f970e11dbab22c2ad994c9ff