Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4f40e7b07ddebf6…

MALICIOUS

PDF

87.7 KB Created: 2021-08-02 09:44:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-21
MD5: 584c29f3ea65c8b2424c8a0017b0551c SHA-1: cc2444e394b1228aa35223adede3e9f3bc7f1188 SHA-256: e4f40e7b07ddebf6d19546448e43951e6f0bcfbb949c1080bd93387a05e29865
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to websites hosted on compromised CMS platforms or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or to serve further malicious content. The document body is heavily obfuscated and does not provide clear textual lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://greenfuturevietnam.com/Upload/files/puluxeg.pdf In PDF document text
    • http://wphs69.com/clients/1/13/13dd0a1135c99f886ff4006aa3c820ba/File/17105966047.pdfIn PDF document text
    • https://adm.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/b1eb69bf819c75514d842ad78a859331/47801770807.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/fukotokumu.pdfIn PDF document text
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/160771cc363df9---66099094953.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160c94521935e6---xapufadikere.pdfIn PDF document text
    • http://romangruszecki.com/uploaded/file/wokor.pdfIn PDF document text
    • https://mikepromedia.com/wp-content/plugins/super-forms/uploads/php/files/4vlrjdk37obi5j97j1iu8j4rb0/60331285390.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/161008c440c2bb---mijepojugube.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/fipejokaw.pdfIn PDF document text
    • http://zabradli-znerezu.cz/userfiles/file/54502638723.pdfIn PDF document text
    • https://clickkedai.com/userfiles/file/45774408677.pdfIn PDF document text
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/43c8032c17ef2e13acca9894b2d55928/20596055760.pdfIn PDF document text
    • http://ophtalmic-overnight.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1610479b0a1fa5---38416641205.pdfIn PDF document text
    • http://beastyenergy.com/userfiles/file/sulodakuburili.pdfIn PDF document text
    • http://toyteepee.com/uploadfiles/file/210513020325518277zpugly.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/zaveri.pdfIn PDF document text
    • http://babamoleskine.com/files/file/44126861575.pdfIn PDF document text
    • https://centrosteadycam.it/wp-content/plugins/super-forms/uploads/php/files/73128830ee5366f828a3186de3964558/ninegotegidifusuwofafik.pdfIn PDF document text
    • http://shinies.ru/img/lib/file/78930186524.pdfIn PDF document text
    • https://tcufroghouses.com/wp-content/plugins/formcraft/file-upload/server/content/files/160775a0f78e35---josojenapapelikozasin.pdfIn PDF document text
    • http://andrelandberg.com/userfiles/file/59012847709.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=archer+farms+spiral+sliced+ham+cooking+instructionsPDF link annotation
    • 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_off0000ef33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF33 18244 bytes
SHA-256: a68a935ede691cad10a7ab8446d765485bc8f17c7fcff124dc6943850e19b443
font_01_sfnt_off00011e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E87 11240 bytes
SHA-256: b6959dfa03798a5532a5439f7e0525225178e7ed9d2c9647d6b7266f78cd4f97
font_02_sfnt_off00013880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1