Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5457dadfed99710…

MALICIOUS

PDF

90.9 KB Created: 2021-09-21 15:10:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: de5476cc9d8a8894b50cd05e77c1c7af SHA-1: 572e0d54e2ed5b42800706687da8ff8c5bd84ed4 SHA-256: f5457dadfed99710b0c1041895e9a094db1b33bae6f8713d1ff66c0333523b79
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to compromised websites or disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

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://autonoleggioassereto.com/file/rupogawovubekodab.pdf In PDF document text
    • http://sjhtractor.com/d/files/fuvuwokutozeponozowadil.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/16884587299.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/rimezulakapu.pdfIn PDF document text
    • http://smingames.com/ckfinder/files/kujigagoraregakabinape.pdfIn PDF document text
    • http://freetds.net/userfiles/file/9919374316.pdfIn PDF document text
    • http://www.parinet.fi/tiedostot/files/58020680691.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/zovowokajukid.pdfIn PDF document text
    • https://movimientofamiliadejesus.com/images/uploaded/file/44478353547.pdfIn PDF document text
    • http://polyacer-ecp.com/userfiles/files/20210918_055330.pdfIn PDF document text
    • http://telegid.tv/userfiles/file/vipubewaze.pdfIn PDF document text
    • https://canionglobal.com/FCKeditor/file/5553015395.pdfIn PDF document text
    • https://efckrakow.pl/userfiles/file/56091318097.pdfIn PDF document text
    • http://dkstores.gr/userfiles/file/70249568893.pdfIn PDF document text
    • http://mweb.cz/images/file/denodedojawip.pdfIn PDF document text
    • http://suachuadienlanhhoaphat.com/hinhanh_fckeditor/file/vomorisisexalagez.pdfIn PDF document text
    • http://baharemadinah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149c000d24c1---xejowasumidexisaba.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/832ed6338176b634ae4809fc3585542a/ruveguduwatujarananige.pdfIn PDF document text
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413de3bd376---vosogoxugirodame.pdfIn PDF document text
    • http://scissortailfarms.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613deb378d4bb---10211279075.pdfIn PDF document text
    • https://alpasol.e-giant.net/upload/files/71473293268.pdfIn PDF document text
    • https://xylemleads.com/userfiles/file/dolakunipomesirubasalibiw.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/gilodawojunitiluwemeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=como+reducir+tama%C3%B1o+video+androidPDF 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_off0000f729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF729 10720 bytes
SHA-256: 1aa2eaf90335cf3882c56b2821ef653827738dd1ffd9c3316fa4c7ef6ad9b6c2
font_01_sfnt_off00010f87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F87 20384 bytes
SHA-256: 656855d9c262f189348040d7d86aa06da21d5fb2a4d91e4ab16c3f5f24280ba4
font_02_sfnt_off0001444b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1444B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1