Malicious PDF — malware analysis report

Static analysis result for SHA-256 603ed375642325d0…

MALICIOUS

PDF

87.8 KB Created: 2021-09-18 05:12:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 10ee1ec7489258c4de7247d228a700a6 SHA-1: e3fbdb1ecf0b87fca4e9b323b405f603b67a176c SHA-256: 603ed375642325d06c66b44bdbe0ebae50d245ba5ceeab550409217d7818fb5d
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The presence of a link farm suggests an attempt to lure users to malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://infrive.ru/uplcv?utm_term=top+10+hentai+games+for+android PDF link annotation
    • https://gmnavarra.es/ckeditor/files/kebemuwuvale.pdfIn PDF document text
    • https://godahoian.com/app/webroot/upload/files/23497187750.pdfIn PDF document text
    • http://watchimport.eu/userfiles/file/navironisuvukopuzi.pdfIn PDF document text
    • http://afro-safari.com/upload/files/36482962354.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/6pqasvos377bv926gisiip66mc/74552153320.pdfIn PDF document text
    • http://biosurfest.com/userfiles/files/88438184949.pdfIn PDF document text
    • https://eurouniversal.eu/ckfinder/userfiles/files/podavinez.pdfIn PDF document text
    • http://greenhere.cn/upload/ckimg/files/202109162148475356.pdfIn PDF document text
    • http://xn----7sbezcba9a5aggb3j.xn--p1ai/ckfinder/userfiles/files/41413693134.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/fafebenedifotituvufe.pdfIn PDF document text
    • http://abwingsbuffalo.com/uploads/files/41816524447.pdfIn PDF document text
    • http://zovsh.com/Uploadfiles/files/41321219807.pdfIn PDF document text
    • http://studiopedrazzini.eu/userfiles/files/wenegemijaw.pdfIn PDF document text
    • http://cesishotel.lv/res/wysiwyg/file/ledurefitagimugu.pdfIn PDF document text
    • http://lilit-realty.com/wp-content/plugins/super-forms/uploads/php/files/gkv1dlm2brlap7if3obt3885n1/73433153328.pdfIn PDF document text
    • http://one9five.com/userfiles/files/noduketesurejaze.pdfIn PDF document text
    • http://avanti.pl/userfiles/file/47093514141.pdfIn PDF document text
    • https://www.huaikrachaohospital.go.th/assets/global/lib/ckfinder/userfiles/files/69613402812.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130a73d2196d.pdfIn PDF document text
    • http://schokofontaene.de/idata/69039691990.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/sizazunis.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/82863199782.pdfIn PDF document text
    • http://amwordpress.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b90adbbba4---weluzajuxunegefebelafe.pdfIn PDF document text
    • http://www.hcibatiment.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16133c55891141---70431240574.pdfIn PDF document text
    • 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_off0000f4d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4D0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010ce7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE7 11036 bytes
SHA-256: fac707407fb803d90a73ebf1f9fc4da2634432d1f73efa604bb80c86efc55b89
font_02_sfnt_off00012637.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12637 16904 bytes
SHA-256: 80dfdd1adfd32278a548666680ff64cf33c05669b3d59a87ff94570bb3139994