Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cf944aa9ab23399…

MALICIOUS

PDF

84.9 KB Created: 2021-09-16 08:36:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 1fe62fd231fa7674bcff4cf595d5d6e8 SHA-1: e585829ac396b02ea91c744dc6d3184023c19125 SHA-256: 2cf944aa9ab23399018e81c06baab6b336a2ff1c7fbed31e287bd980d6ac209b
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to lure users to malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://infrive.ru/uplcv?utm_term=pdf+reader+app+for+android PDF link annotation
    • http://simsvizag.com/admin/uploadedfiles/file///46384760465.pdfIn PDF document text
    • https://defi128.com/userfiles/files/92830728370.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/161387036269bf---ginejetapigoge.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/1accdfcd9b92b49efc0b1e72a6cb0b96/64867757824.pdfIn PDF document text
    • https://crownprolaw.cn/userfiles/Proj_Name/files/zepelolex.pdfIn PDF document text
    • http://thanhnienxp.com/vietkiendo/upload/file/21372116499.pdfIn PDF document text
    • http://tabouligrill.com/ckfinder/userfiles/files/nirivotogamuzarefufaxew.pdfIn PDF document text
    • http://antifftech.com/uploadfile/file///2021090423194889.pdfIn PDF document text
    • https://trungtamgiasuhcmmq.com/uplaod/quangtri/files/resarilefijuxevaxonaku.pdfIn PDF document text
    • https://cupanghitam.com/contents/files/sivasuxiw.pdfIn PDF document text
    • https://aldurra.ly/images-editeur/img/file/88312579254.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/d73ce6b2a5c135d83ff54137b335f784/14189202261.pdfIn PDF document text
    • http://ajmason.com/admin/ckfinder/userfiles/files/tinodaxolupunuwatotoxinum.pdfIn PDF document text
    • http://bangkokmagnetwire.com/ecodev_test/image_system/files/23135857889.pdfIn PDF document text
    • https://shen-su.eu/gfx/userfiles/files/ridoduwa.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/sasaxofikomawenimonetufun.pdfIn PDF document text
    • http://mobitransjogja.com/files/rofopo.pdfIn PDF document text
    • http://holzbau-napetschnig.at/moxitosirinogabowit.pdfIn PDF document text
    • https://solelane.com/ckfinder/userfiles/files/butogowakimuwagopuretugo.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/relegigenubemaxorapavo.pdfIn PDF document text
    • http://salonmysliwskirys.pl/userfiles/file/rumarigikexulebasimalijon.pdfIn PDF document text
    • https://umutisi.com/umut/upload/files/lukedufezopig.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/1674183181613df03133cfd.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/21342399934.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_off0000e9f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F7 17324 bytes
SHA-256: fb5a59615320fdcdb0b6a460edbe1e2cb7f2d1c25b158ed85d6565ec25123f56
font_01_sfnt_off000116cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ee3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EE3 10180 bytes
SHA-256: 7d76343595b1555c2f6593f52bb98a059aae655ad3642c9850d882272362d7e9