Malicious PDF — malware analysis report

Static analysis result for SHA-256 483a821ed5b67fed…

MALICIOUS

PDF

92.9 KB Created: 2021-06-28 18:41:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12672969e68cead7d44fbf03893d53d6 SHA-1: 6f191e0b7e8154ed2c29fbde9603500181ced3b1 SHA-256: 483a821ed5b67feda02112e34af51532027649b555eb62d286ce563d144e9b21
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics and an ML classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains numerous embedded URLs pointing to compromised WordPress sites and other disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these external links indicates an attempt to lure victims to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9935

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://huntic.ru/uplcv?utm_term=knees+hurt+from+sitting+all+day
    • http://euroteam.vn/ckfinder/userfiles//files/77419895699.pdf
    • http://aeronautike.com/userfiles/file/3728719901.pdf
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609fdb622befd---16613267947.pdf
    • http://deurwater.com/wp-content/plugins/formcraft/file-upload/server/content/files/160cb88a766a23---pebedupumimiw.pdf
    • https://www.temsilcifirsatlari.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ca2e5bf3c1---82901770995.pdf
    • https://limpjet.com.br/wp-content/plugins/super-forms/uploads/php/files/479b191e1b80e0183ec59fa31bab9d43/25886174936.pdf
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/160984bc9e89ca---91581148636.pdf
    • https://sakitonus.ru/wp-content/plugins/super-forms/uploads/php/files/d71f02a61c9b3c2a65c1b0fd6e9189fa/mazawaxadarojif.pdf
    • http://eperon-kochersberg.com/img_db/xelemesu.pdf
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/1tenc0v64kaln7i1tkqsvsbuik/fozixaxepagoturupabavoma.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160b42a14c5a47---33458893440.pdf
    • https://ytdrive.com/CKEdit/upload/files/jajovizadimip.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/porirez.pdf
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ae47147bf99---bozetivujuxogiwav.pdf
    • http://waltwhitmanclassof1965.com/clients/c/cc/ccbfa8a87e297cd67510599b8aebcb74/File/58725554823.pdf
    • http://comicpapyrus.com/wp-content/plugins/super-forms/uploads/php/files/1a27ff96e93108556289e6b3e9c50bf9/79911118595.pdf
    • https://wamsconference.com/wp-content/plugins/super-forms/uploads/php/files/74a47d4456cf256398889e4718845640/kamoretejijipikepitux.pdf
    • http://personnelstrategies.net/userfiles/file/raluzanejorexax.pdf
    • http://learningkey.org/userfiles/tafumatitupuluxibegefelo.pdf
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/b6a781bde14bbfa6431cf97acd930c41/tidapivire.pdf
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/4b0b579ff790397d52dcaa78e2f9dd8a/56402036357.pdf
    • http://warraichmeats.com/wp-content/plugins/formcraft/file-upload/server/content/files/160814a8230cc1---54391643464.pdf
    • https://puppometalli.eu/file/54819015964.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/b65a319eec38438a099ee78d4c97bdec/96642509339.pdf
    • 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_off000108d2.bin
510ee4274e90c5a368dc23291f3b23fe649502c0cb26ef8255a1a96d4557a029
pdf-font-stream PDF embedded font (sfnt) at offset 0x108D2 11004 bytes
font_01_sfnt_off00012206.bin
55b3e50ce8f25adaad8d58e9df7404c792c41ec83b87ee97d9f3382220e825ed
pdf-font-stream PDF embedded font (sfnt) at offset 0x12206 16908 bytes
font_02_sfnt_off00014e53.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x14E53 16792 bytes