Malicious PDF — malware analysis report

Static analysis result for SHA-256 4be19247ab73ff88…

MALICIOUS

PDF

84.6 KB Created: 2021-06-25 20:42:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a0ac1cf0949ef49c5c47d7df2855c2a3 SHA-1: 882f568c3b0ef2ac3d05ab53aa04f92a45de030b SHA-256: 4be19247ab73ff889db664529aecb132c1a6c0b793bd0249b21f3db15394a047
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links to external websites, many of which are hosted on compromised CMS platforms or appear to be part of a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery. No scripts were extracted, but the structure suggests the PDF's primary function is to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 7

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/16094d60983bed---juvizawipadi.pdf
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/ca858010c3b511f2f4804e7943ddfb13/39314862955.pdf
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/pk75e174dv87iqv8lnq7hsspt5/tamigowonagasisofamux.pdf
    • https://itacademyindia.com/ckfinder/userfiles/files/73308320044.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160790ba436f9e---vurabivekeganekesivod.pdf
    • https://bonpetsupply.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607567a2397cc---23154387883.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160a62937e8c6a---69289348720.pdf
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/bf7b6124562eb81f3186fecefe8aa4a4/nalerubelonanojuto.pdf
    • https://atlanthealth.com/wp-content/plugins/super-forms/uploads/php/files/0cdd499dfacb1295f865da002606ac88/jitorobiwes.pdf
    • http://medicaldistri.com/ckfinder_files/files/11795985557.pdf
    • https://boldvision.tv/wp-content/plugins/formcraft/file-upload/server/content/files/16076c480dfc98---sudovupofevif.pdf
    • https://lerong.vn/wp-content/plugins/super-forms/uploads/php/files/da4b39ac2e0f78768f2c6ce4a54c7d36/dutikuvamerade.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16076d0539eae3---dedonebo.pdf
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/a1eb93e2f96be200ce4dc91fdd7a5e71/86015942541.pdf
    • http://location-appartement-venise.com/italie_documents/files/65050033578.pdf
    • https://jf-orvalho.pt/userfiles/file/newekar.pdf
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1609617571d049---loropegubotigodokiwon.pdf
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e889d46dcb---54104258931.pdf
    • http://share-world.tw/userfiles/file/fotelitojepaje.pdf
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082b8ad22690---42893985661.pdf
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/891de0af92cd913b181b13bd8a12cab2/jozikafilipe.pdf
    • https://www.citysecurity.org.uk/wp-content/plugins/super-forms/uploads/php/files/gasfp4703lhkfa4ath0h1ekgrs/zuleba.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f5e5a282eb---64437441489.pdf
    • https://bizdrive.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/16093bbbf58759---vogogowopitilojek.pdf
    • https://lea-inc.com/wp-content/plugins/super-forms/uploads/php/files/789f939cd5007711915cf3b78ea6be28/lafovesiwap.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=cfc+and+hfc
    • 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_off0000ea50.bin
b5bc0568712e351d39411b288ad32f51c703bbeb7f141872049be80dfb3c34f9
pdf-font-stream PDF embedded font (sfnt) at offset 0xEA50 9848 bytes
font_01_sfnt_off0000ffd4.bin
e0bad889acdaf61ea8f3b8ffaf305abfcee7a5193e0e381cd994a0137b65581b
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFD4 17820 bytes
font_02_sfnt_off00012d75.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D75 16792 bytes