Malicious PDF — malware analysis report

Static analysis result for SHA-256 86d622b74692f353…

MALICIOUS

PDF

73.4 KB Created: 2021-09-19 16:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 64c2ef079b50673901d02e95e5127991 SHA-1: 7291a3c09c7879e5f01f26c231b4d8bb244ff3ae SHA-256: 86d622b74692f35354416e649be9ed16c5482ce2b1bcc7fbeb2051e5fda892f4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised WordPress uploads and disposable hosting, suggesting a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the PDF structure and URL analysis point to a phishing or content-luring attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.rajpuc.pl/pics/file/34804676825.pdf In PDF document text
    • https://psihodesk.ro/ckfinder/userfiles/files/45892623278.pdfIn PDF document text
    • https://xn--49st2et51duvk.com/upload/files/sujes.pdfIn PDF document text
    • http://tpdw.pl/userfiles/file/20447036920.pdfIn PDF document text
    • http://105chers.netsociality.com/upload/files/nimexemex.pdfIn PDF document text
    • https://thietbixanh.net/uploads/files/94035883953.pdfIn PDF document text
    • https://www.frontierexim.com/wp-content/plugins/super-forms/uploads/php/files/709irkpv2qh9m0u64spfc0jpf6/ranelutuzag.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/71155540089.pdfIn PDF document text
    • http://getsolarnj.com/userfiles/file/lovubu.pdfIn PDF document text
    • http://nwatchonline.net/userfiles/file/zuredoweluvowitogapibo.pdfIn PDF document text
    • http://faradbox.pl/files/file/56658971118.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161328c47104fd---sofivasapizizusakijipun.pdfIn PDF document text
    • http://affectif.ro/data/Image/file/ragejeveti.pdfIn PDF document text
    • https://stop-remont.ru/ckfinder/userfiles/files/4541609848.pdfIn PDF document text
    • http://orthopaede4you.de/userfiles/file/mewakekomixejesejevedu.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613694d435fc6---denaximaj.pdfIn PDF document text
    • http://myucpb.com/userfiles/file/pafevapujepulekoxasoxal.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/bisonofizikemani.pdfIn PDF document text
    • http://pixel-pro.ru/upload/file/72063160173.pdfIn PDF document text
    • http://georgewongdesign.com/gwd/upload/files/sabunutupowuretezezenobur.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=a+quiet+place+part+2+free+movie+onlinePDF link annotation
    • 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_off0000bce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBCE7 10884 bytes
SHA-256: b95c0715c7e396bc17444173553aca8b218b62f3d27f6bde94d80375a6ebf55c
font_01_sfnt_off0000d627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD627 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ee39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE39 16548 bytes
SHA-256: 514a324ba4fe2fc480886b8b8c71361dbc8594f6a63955d2217c49770a1e1726