Malicious PDF — malware analysis report

Static analysis result for SHA-256 506f9a911833d29f…

MALICIOUS

PDF

92.0 KB Created: 2021-06-27 17:04:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-25
MD5: ce0d1f9bcc6bd9aa03d60998a5f829aa SHA-1: 22fe2fa46bd6b790e1b74b9852336391fb933bf3 SHA-256: 506f9a911833d29fd9eb4b7de6a0b5a314588a8904e3ffe4a3e25a3e359ff543
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of links pointing to compromised WordPress upload directories and other disposable hosting, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The file's structure and numerous external links are consistent with a malicious PDF designed to lure users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

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://garglob.ru/uplcv?utm_term=absent+from+the+body+present+with+the+lord+verse PDF link annotation
    • http://ashioke.com/images/library/File/91359785270.pdfIn PDF document text
    • http://www.risingstars.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16096c7c0a59da---7976204035.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eda713df48---kodapinoxogeji.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ebbcb6b81b---pituturupobexoj.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/ramamupi.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d268e11098a43460318f4fe0e6b3b4d1/32316244348.pdfIn PDF document text
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/ibj3qq6v9d6opfev9khiejnek6/popatatuwirerimeg.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/gebimikaletigo.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/16090d18f10bc5---62190999860.pdfIn PDF document text
    • https://law.com.sg/wp-content/plugins/super-forms/uploads/php/files/89f39302c933b8bcc4e784374f034c89/59405851519.pdfIn PDF document text
    • https://vashadvokat82.ru/wp-content/plugins/super-forms/uploads/php/files/ecd6925cdd7c3b637c5510ae3f41886a/vokutivuvozajuzojato.pdfIn PDF document text
    • https://engravestone.com/wp-content/plugins/formcraft/file-upload/server/content/files/160862fdb631ec---80617447104.pdfIn PDF document text
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/caicdgm38n4a80or290ejqqu3e/kaletasumadiwimo.pdfIn PDF document text
    • http://zawayakw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099e54132bdb---44387945823.pdfIn PDF document text
    • https://seataclighting.com/wp-content/plugins/super-forms/uploads/php/files/a3386722d842c298694695f992888f8b/58884667211.pdfIn PDF document text
    • https://www.duffylighting.com/wp-content/plugins/super-forms/uploads/php/files/74196620e779f3c1e2a94e6b4581dddb/36206134263.pdfIn PDF document text
    • http://epmachine.ru/d/files/nixorevo.pdfIn PDF document text
    • http://principessavencanice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bd54790174b---kedew.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/h5pb8a8ldf4590gtv1neckp1tr/duzule.pdfIn PDF document text
    • http://www.pranabkumar.com/fckimages/file/17852880042.pdfIn PDF document text
    • http://maychamsocda.vn/images/userfiles/file/dalupujenibugufixusabux.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/porozaza.pdfIn PDF document text
    • https://bechtoldpaving.com/wp-content/plugins/super-forms/uploads/php/files/bdfe51e4e0fb566945cb069fbae1c8db/64987269752.pdfIn PDF document text
    • http://computergramm.com/userfiles/file/57826464321.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBF9 16580 bytes
SHA-256: 390611c906f779fcd8395f9f3ea7510563a6b210023bede5d1b81c0affa61c66
font_01_sfnt_off000116df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116DF 16684 bytes
SHA-256: 5786d7639d2cc1522a1a3889fae5b5c9fbcbd5f5c9de2f5a2930a0e54327038d
font_02_sfnt_off00012e7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E7D 10988 bytes
SHA-256: 0e5bca3cc44f067d2e0bf9e4a997a49772f2b2af1d81ad39735e6a57d5049838
font_03_sfnt_off000147b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x147B1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1