Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a816878cc92fb79…

MALICIOUS

PDF

95.8 KB Created: 2021-07-01 11:49:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 92dfac2726e9b495c92f206a657474d3 SHA-1: d051bcdbf49e51b90be0ecbaa43918bf1731e185 SHA-256: 6a816878cc92fb7997fb0e382b67f62945c7e321dec1b9d553cad4ab1eaabb92
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to initiate malicious actions. The sample also exhibits characteristics of a link farm, with numerous URLs pointing to compromised CMS upload directories and disposable hosting, suggesting an attempt to redirect users to malicious sites. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9942

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://bednidhitraders.com/userfiles/file/wibeta.pdf
    • http://docando.es/js/ckfinder/userfiles/files/48117548713.pdf
    • https://www.synergyheart2heart.team/wp-content/plugins/super-forms/uploads/php/files/fl8eukumaanb04ge4l62jdrajd/gepivopawijox.pdf
    • http://bociany.sk/media/file/82703405882.pdf
    • https://fiambreszav.com/wp-content/plugins/super-forms/uploads/php/files/9ba0ec75b6092288e863d7a0f9855687/51871977008.pdf
    • http://drironcat.com/images/file/64168345948.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/f4vdgei9k9vkauhq1vc1pdh7e2/10800776189.pdf
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/160a05194c2e91---wepoxapawigozuzojesojub.pdf
    • http://notarbrazda.cz/userfiles/file/87355777360.pdf
    • https://hightechrustremovers.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160a6d4a7e6104---vazonilevuwelojezudejeti.pdf
    • http://es-umzuege-transporte.de/wp-content/plugins/super-forms/uploads/php/files/81a982388711f6ec574be7a5074b2666/tijupifowidelav.pdf
    • https://ethiquedevelopers.com/wp-content/plugins/super-forms/uploads/php/files/d048942abab39081fb5c0c3654cd35c4/49653698715.pdf
    • http://ankaser.com/userfiles/file/78734267840.pdf
    • https://blackknowledge.com/wp-content/plugins/super-forms/uploads/php/files/8159bba3d50fb37b5accd8c6d05804f6/nefopixobinogoluboninuk.pdf
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/4ec70a603db9898cff3f479cfa26ceea/pomebutivemi.pdf
    • http://kasystemofkarate.com/clients/861259/File/45022547455.pdf
    • https://robertmatzuzi-massagetherapist.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16071fb718b260---23381769559.pdf
    • http://quickvideo.nl/userfiles/file/37951188482.pdf
    • http://pnmanagementsolutions.in/uploads/8449738416.pdf
    • http://gsxr.hu/userfiles/file/31646130506.pdf
    • http://hit-air.pro/ckfinder/userfiles/files/57027415315.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16089eb648130d---tamelozurukinuzazodo.pdf
    • http://booklandbooks.com/userfiles/file/40251561049.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/A3Ryygt5BCM/uplcv?utm_term=role+of+isoamyl+alcohol+in+dna+isolation
    • 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_off000112ee.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x112EE 16792 bytes
font_01_sfnt_off00012b00.bin
759abc46d5ec7533cc476efeb2dfb1aaa964fe5e3553d03f157ad3e74120b928
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B00 17548 bytes
font_02_sfnt_off000158e4.bin
0893980b61249fabe2847a6446dea427e63a881098f803a1319eb1029f7a0def
pdf-font-stream PDF embedded font (sfnt) at offset 0x158E4 10800 bytes