Malicious PDF — malware analysis report

Static analysis result for SHA-256 c3d878048615a28b…

MALICIOUS

PDF

87.7 KB Created: 2021-06-28 17:04:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ce2f9ceab9ee734049ef4b21e298d49c SHA-1: f1ed8fa09e81b96f7cb37a705702a91bf87c45a3 SHA-256: c3d878048615a28bf365ba6a6b9598c55a1c6919d11345fd8ce8bfb5e0421563
276 Risk Score

Malware Insights

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

This PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of social engineering attacks. It contains multiple links to external PDFs hosted on compromised websites, suggesting a link farm designed to distribute malware or phish for credentials. The heuristics indicate lures for password-protected archives and MFA harvesting, further supporting a phishing or credential theft objective.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • ClickFix social engineering attack high SE_CLICKFIX
    Document instructs the user to press Win+R or paste a command into a terminal — consistent with ClickFix attacks that bypass macro restrictions by tricking users into running malicious commands directly
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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://vickers-electronics.co.uk/wp-content/plugins/super-forms/uploads/php/files/56e35e0ed142cda31b7b5e22b2b3fb40/lafatutix.pdf
    • https://actorconseil.com/files/file/80933118930.pdf
    • http://pressvaluation.net/userfiles/file/fanonukubepudisorin.pdf
    • http://www.majorisinvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160d863fe433bc---66284173696.pdf
    • https://www.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/160b91cb65771c---25668771403.pdf
    • https://al-farh-iq.com/upload/userfiles/file/fuvomoseporubadevezab.pdf
    • http://hilimall.ae/uploads/files/pedekamixojopi.pdf
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606da396b3205---tapedixaxopigipatujidevov.pdf
    • http://www.sunarmisir.com.tr/wp-content/plugins/super-forms/uploads/php/files/1mbi01g22rc158obblufvuf3i0/82234367320.pdf
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/3dcaba500b77f736733d6f51336acab2/39750823877.pdf
    • https://hmv.ir/wp-content/plugins/formcraft/file-upload/server/content/files/160736714abd85---sujaruvom.pdf
    • https://esteticarcare.com/wp-content/plugins/super-forms/uploads/php/files/2693fe19e67bd684fddd79811c10b56b/naxesuvis.pdf
    • http://thedreaminitiative.org/Content/Admin/uploads/files/17385906054.pdf
    • https://advantagelic.com/singhania/downloads/file/kigofefexakixa.pdf
    • https://uaqbakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f276e30f95---tibufuwabevo.pdf
    • https://www.webhisto.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160ce719292b36---lewaweguri.pdf
    • https://weeb.nu/userfiles/file/pinapidaruxubikopa.pdf
    • http://pulsrmedia.com/wp-content/plugins/formcraft/file-upload/server/content/files/160867763f22f8---nepupelisepugibigite.pdf
    • https://makeswebsites.com/clients/c/c8/c8c605999f3d8352d7bb792cf3fdb25b/File/defowi.pdf
    • http://n2nlah.org/UserFiles/file/bumexeki.pdf
    • http://prunay-en-yvelines.fr/ckfinder/userfiles/files/42889202278.pdf
    • http://traiteur-ribot.fr/userfiles/file/61415999759.pdf
    • http://orhs76reunion.com/clients/30721/File/gamejubepuvurud.pdf
    • https://dansobentre.net/uploads/file/324014861.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=how+to+recover+pdf+password+online
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f081.bin
329e80378b82a09892a4325473eb46c61343a3d42235cbe249749277aedc50ae
pdf-font-stream PDF embedded font (sfnt) at offset 0xF081 18168 bytes
font_01_sfnt_off00012056.bin
55530774e7063598953eb078bd51b2ca556c9cfbdc1acea5dba4e7ffb93377a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x12056 10756 bytes
font_02_sfnt_off00013938.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13938 16792 bytes