Malicious PDF — malware analysis report

Static analysis result for SHA-256 13a9c2d6c0e2d34b…

MALICIOUS

PDF

85.6 KB Created: 2021-09-17 15:27:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5ed1e497a4cdbbe3ade9ca5a877f6f1f SHA-1: 2b60d737a604ba7f4db1e1264f025c63592a1ba9 SHA-256: 13a9c2d6c0e2d34b658c97e71292cb45263a7acc158937c7de22f7d53aa823ab
156 Risk Score

Malware Insights

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

The PDF contains a link farm with numerous URLs, many pointing to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware hosting sites. The presence of multiple links on disposable or compromised hosting further supports a malicious distribution pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9860

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://karcannakliyat.com/userfiles/file/talen.pdf In PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/b58bc118ba8ee1e04060a7204d0e33c5/51997647414.pdfIn PDF document text
    • http://architettoletiziamasciotta.eu/userfiles/files/noguxigasizaluliwineva.pdfIn PDF document text
    • https://yptea.com/data/fckeditor/files/rizoberarazizelo.pdfIn PDF document text
    • https://kasihpaham.com/contents/files/zixemikiratitogoguka.pdfIn PDF document text
    • http://sin-hua.org/userfiles/37938533753.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/6bde95ff791b24e16f56d2ed30d94eba/posefuxiketisotemobevala.pdfIn PDF document text
    • https://coevent.ru/upload/files/pezeteti.pdfIn PDF document text
    • http://magnumprint.ru/upload/files/31596481873.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/b7gpe01pj4bb1n4ticvrt34jq6/rexaniwagijivaguzeza.pdfIn PDF document text
    • https://familienbilstrup.dk/userfiles/file/60885917173.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/nijefikevaxasutu.pdfIn PDF document text
    • http://webinaris.org/ckfinder/userfiles/publics/files/96177280685.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/tadatezisetefino.pdfIn PDF document text
    • http://www.nanodrywash.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130e4343ffb2---46690426286.pdfIn PDF document text
    • https://www.mds-horizons.com/upload/files/lumonop.pdfIn PDF document text
    • http://csc028.com/userfiles/file/20210913035624_27mgkm.pdfIn PDF document text
    • https://ratosatu.com/contents/files/26972538443.pdfIn PDF document text
    • http://seamacros.com/upload/file/jilapitezi.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/35382334404.pdfIn PDF document text
    • http://rydelko.eu/userfiles/file/sojugedef.pdfIn PDF document text
    • https://badoza.net/userfiles/file/kexekixofapemowewuposetif.pdfIn PDF document text
    • http://hanasushi6.com/uploads/files/zaguxe.pdfIn PDF document text
    • http://www.superior-inkjet.com/login/ckfinder/userfiles/files/nikaberezuxudut.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/9670270767.pdfIn PDF document text
    • http://architettoangeli.it/userfiles/files/3429473227.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=jungle+book+characters+picturesPDF 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_off0000e89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89F 18108 bytes
SHA-256: 4ef9acee3d74ca25e70e795b207c84718a10a73048630a7d0e02d94dd4f2c0a8
font_01_sfnt_off00011792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11792 10976 bytes
SHA-256: 57f8692861dae52d9d90a9b96b32b44f7c9e048473624d04ad710f98b00e3645
font_02_sfnt_off000130d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1