Malicious PDF — malware analysis report

Static analysis result for SHA-256 9653205d97deb175…

MALICIOUS

PDF

118.7 KB Created: 2021-07-08 09:44:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: 7ca7d5d4c69efbf6e3525bbf87184791 SHA-1: 07b9315ebc02b7a826ceffa9d53439685f663601 SHA-256: 9653205d97deb1750f2c1f1e14921a593c68e74144eb9904f0966978df6285a2
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate maliciousness, with ClamAV identifying it as a phishing trojan. The file's structure suggests it's designed to lure users into clicking links that lead to malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://www.clubmanizales.com.co/wp-content/plugins/formcraft/file-upload/server/content/files/16077528ebb814---ginimuwananalapozuvilug.pdf In PDF document text
    • http://dolinakrzeptowa.pl/public/upload/ckfinder//userfiles/files/97945769371.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/rpmn3mcdlpauvlc9kh27v6rb94/tarip.pdfIn PDF document text
    • https://hartwellcook.com/wp-content/plugins/super-forms/uploads/php/files/fdd9ad6f48e2d0ab5d36ed4d0c272c5d/nulini.pdfIn PDF document text
    • http://thamdinhgiadaiquang.com/img/files/xitiruz.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/fesukinorumuxeruk.pdfIn PDF document text
    • https://bdaudit.ro/userfiles/file/26543659750.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/32399345213.pdfIn PDF document text
    • https://taxiporec.top/wp-content/plugins/super-forms/uploads/php/files/329p3kvk9g7ij5fuoh9agiv3io/11594464303.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d255a272227---ziposilafo.pdfIn PDF document text
    • https://alfa-pechati.ru/wp-content/plugins/super-forms/uploads/php/files/400ecc4726bf3938e647e16a37b1ac06/7190999110.pdfIn PDF document text
    • http://soflcops.com/clients/83267/File/ruvuwaxemugorunavufufinem.pdfIn PDF document text
    • https://earthideasawnings.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a01024245f8---6009084579.pdfIn PDF document text
    • https://bikinibody.be/wp-content/plugins/super-forms/uploads/php/files/314c297p09db37k6mc1failiqq/61567002358.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/somebavikowuniwevoneraku.pdfIn PDF document text
    • http://ontheedgeofnow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b26ffd75771---nonagagasigiraxinakitifaj.pdfIn PDF document text
    • http://centrons.com/uploaded/file/191084200060dd840256f7f.pdfIn PDF document text
    • http://ahxxzx.com/userfiles/202104/file/mokakaronurepixu.pdfIn PDF document text
    • http://giaodantanthaison.com/Images_upload/files/jupesapasozijenagobixejup.pdfIn PDF document text
    • https://diversified-nj.com/wp-content/plugins/super-forms/uploads/php/files/e096ba7bf731cba2ff49e0889173a09f/8973315970.pdfIn PDF document text
    • http://www.cuadernos.in/wp-content/plugins/formcraft/file-upload/server/content/files/16084695beec71---xebuluxagawinunodani.pdfIn PDF document text
    • http://nessium.net/userfiles/file/ginepodavine.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a45a3aa993c---89733973072.pdfIn PDF document text
    • http://baraanduliaptti.org/userfiles/file/kunapakevuzab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=capf+study+material+pdf+free+downloadPDF 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_off000168b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x168B9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000180cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180CB 18660 bytes
SHA-256: 7beeb393131d49451ad9b4aeea39f25e42a9f631c6968a1156324309fa154431
font_02_sfnt_off0001b208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1B208 10988 bytes
SHA-256: 79f375d141a44ddca1dd68ad87e27229a0d6056233062cc85df57c5b9d909a35