Malicious PDF — malware analysis report

Static analysis result for SHA-256 3f36d43f46e59448…

MALICIOUS

PDF

70.3 KB Created: 2021-09-25 17:41:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 141b419aeb132983fb65d3cf6be4f53f SHA-1: 6ecf9ef213adbb953812d6b0e8f6275ec8d4d8ad SHA-256: 3f36d43f46e59448d6ffeb7160731995309f9b1f364ff803a2bf40a0b90228eb
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm designed to lure users to malicious sites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The presence of external URIs and link farms points towards an attempt to exploit user trust through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://lamexmarket.com/uploads/files/39899443476.pdf In PDF document text
    • http://ekopaczka.pl/imgbrama/files/jusujimoxumupowupolejusor.pdfIn PDF document text
    • http://vasvaripalmuzeum.hu/upload/file/85894365392.pdfIn PDF document text
    • https://marikakozmetika.hu/editor_up/movawan.pdfIn PDF document text
    • http://studiostocchi.eu/userfiles/files/tibonog.pdfIn PDF document text
    • http://cncsprings.com/d/files/bofikes.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/gur4if3pnb2sqqdlhkn6v445p3/nibepavexapebutizibi.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/mopuludutuwo.pdfIn PDF document text
    • https://telewebmarketing.com/FCKeditor/file/vuzopirolovigaruba.pdfIn PDF document text
    • http://www.rolstoellift.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408a959efaa---40989071887.pdfIn PDF document text
    • http://kystop.com/wp-content/plugins/super-forms/uploads/php/files/01649b52863c3b615d338c94fadb3d8b/dexurumezexasu.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-10/20210910163230393920.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/wubiwunolanogodimif.pdfIn PDF document text
    • http://milwaukee.center/userfiles/file/49102433567.pdfIn PDF document text
    • http://anpharma.net/upload/files/49715812703.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/61345691641.pdfIn PDF document text
    • https://pmapmc.com/userfiles/image/files/gisof.pdfIn PDF document text
    • http://kperrylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/21718357820.pdfIn PDF document text
    • http://zespolbahamas.pl/zdjecia/file/fewaxuvivoge.pdfIn PDF document text
    • http://skolky.info/foto/images/file/72624977756.pdfIn PDF document text
    • http://italiangreyhound.pl/img1/userfiles/file/61286109048.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-17/images/files/65943854254.pdfIn PDF document text
    • http://ms-krmelin.cz/app/webroot/files/files/60993853974.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=shadow+fight+2+titan+mod+apk+2020PDF 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_off0000b193.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB193 10996 bytes
SHA-256: f52a4d1ac804aadb87f40fec4c3116debc3d0e18a5afce9b90c37ae5af103c15
font_01_sfnt_off0000cad1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD1 15776 bytes
SHA-256: 4580b7114fd47285671cca43b9db7e74f62cac0e51cd2b4298736914f241f3b8
font_02_sfnt_off0000f344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1