Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d08a63c2942f981…

MALICIOUS

PDF

81.6 KB Created: 2021-09-22 17:14:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a882490cd2282e8e746ac5000ef284d4 SHA-1: da2b94662dc2c23ce5dbc8dd34804e5eb0de8542 SHA-256: 5d08a63c2942f9811d1facbaafb1e5d9c383c25ffeb56810a3d905a6d0d8e94b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs that function as a link farm, with many pointing to disposable hosting or compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or SEO manipulation. The file's structure and URL patterns are consistent with efforts to drive traffic to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=anderson+fluid+mechanics PDF link annotation
    • http://areawifi.com/DESARROLLO/userfiles/files/38558686900.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144230742b86---65287032796.pdfIn PDF document text
    • http://gsprojekt.eu/userfiles/files/5670379398.pdfIn PDF document text
    • http://salonorganica.ru/upload/files/31480904948.pdfIn PDF document text
    • http://xn-----6kcaheblih5ab0a6afqbzoqe.xn--p1ai/ckfinder/userfiles/files/31318510524.pdfIn PDF document text
    • http://gcoekmr.org/cukashmir/User_Files/imagefile/tiboripetifix.pdfIn PDF document text
    • http://abwingsjanaf.com/uploads/files/27272873816.pdfIn PDF document text
    • http://studiotecnicolamanna.com/userfiles/files/5789563262.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/dovepewanetuxizasuvu.pdfIn PDF document text
    • http://elcolono.net/userfiles/files/94032686652.pdfIn PDF document text
    • http://trustarshida.co/cache/fck_files/file/45888220010.pdfIn PDF document text
    • http://razzledazzleevents.in/userfiles/file/jegep.pdfIn PDF document text
    • https://hawkseyetravels.com/assets/ckfinder/userfiles/files/29780396138.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614439ec15bf4---nananaxinozu.pdfIn PDF document text
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2be08954b---jebigasugitivaxanit.pdfIn PDF document text
    • http://aceonlinementors.com/userfiles/file/rovamit.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210912002713.pdfIn PDF document text
    • https://lenaoyunlar.net/calisma2/files/uploads/senaxawu.pdfIn PDF document text
    • https://jck.ro/userfiles/file/xomuwemamojerejuburumexa.pdfIn PDF document text
    • http://harissarantis.com/userfiles/files/nirorifotagamu.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/20241840851.pdfIn PDF document text
    • http://agnieszkapawlik.com/userfiles/file/61238340313.pdfIn PDF document text
    • http://bud-med.eu/userfiles/file/52367206487.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/8457280870.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_off0000dc6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6E 10724 bytes
SHA-256: 1f368724c0ac5f81900b6e1de36e2fa3ba716601de3b3dd5bd1fa84e2a68c8e5
font_01_sfnt_off0000f4d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D6 16828 bytes
SHA-256: db9d3ff79ce3da8a73057cf53a5281463c4437902370d3b27212ee1a2bd39073
font_02_sfnt_off00012078.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12078 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1