Malicious PDF — malware analysis report

Static analysis result for SHA-256 17aa3b41c7d6811b…

MALICIOUS

PDF

84.5 KB Created: 2021-08-25 14:59:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: d28689eb4563962d849a9c58d91c3bd2 SHA-1: f97bf25ddaf9982278f67d3a45dbdf54ac87d615 SHA-256: 17aa3b41c7d6811b410ae38a9c84d9a029bd97bcd72feaa47854a6dd84b5f13d
164 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection to these malicious URLs, potentially exploiting vulnerabilities within the PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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 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://laborke.ru/uplcv?utm_term=gold+dragon+in+dragon+city PDF link annotation
    • http://adanateknikservis.web.tr/wp-content/plugins/formcraft/file-upload/server/content/files/1607e50af4f6ca---fuzakavarewakid.pdfIn PDF document text
    • https://rrvchefs.com/wp-content/plugins/super-forms/uploads/php/files/faa5dd15400b34275ad4b6ca7b35ed40/23331848396.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/takajapa.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/terupirokiro.pdfIn PDF document text
    • http://ccymgr.com/clients/a/ab/abc9983c1712fd324c9320bcfcf975a8/File/dupuwuvowisosivijulapuj.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c5fdbef408---laratotetusof.pdfIn PDF document text
    • http://bayanairag.com/uploads/userfiles/files/14621602388.pdfIn PDF document text
    • https://szalkasszorutacskok.hu/app/webroot/files/content/files/dexoxogerekobobisiz.pdfIn PDF document text
    • https://www.tulsarad.com/my_content/js/ckfinder/userfiles/files/vagekupimakaja.pdfIn PDF document text
    • https://www.stock2morrow.com/ckfinder/userfiles/files/98933096521.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/5941852832.pdfIn PDF document text
    • http://studiotecnicodavico.eu/userfiles/files/sirip.pdfIn PDF document text
    • https://cursosgratuitosonline.es/wp-content/plugins/super-forms/uploads/php/files/nlk278g43937o58o92i4cuvhcd/tubotufetolaz.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/47318711972.pdfIn PDF document text
    • https://k-newsletter.com/ckupload/files/topizi.pdfIn PDF document text
    • http://xn--9w3b11kh5l.com/ckupload/files/wokovenasojiwamuvokof.pdfIn PDF document text
    • http://amexeuro.com/an3_Uploads/file/17471186406.pdfIn PDF document text
    • http://qunjl.com/userfiles/files/zudiremid.pdfIn PDF document text
    • http://yevres.fr/ckfinder/userfiles/files/verurimadeda.pdfIn PDF document text
    • http://christopherdallo.com/file/59663618226.pdfIn PDF document text
    • http://www.dismaplant.com/ckfinder/userfiles/files/vokafetegokatemedoduwe.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160823b83e8351---maxasajuverobor.pdfIn PDF document text
    • http://ambiance-cinema.fr/wp-content/plugins/super-forms/uploads/php/files/267c8989331899e34e5d5d535c2c860b/1326780689.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6AF 17608 bytes
SHA-256: 5a592a6854c6a8dc051dc5a442e7a8adfcd9796e83ecadd49648bb8b8601176a
font_01_sfnt_off0001144a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1144A 10400 bytes
SHA-256: 7fea0042de0c2dc29608242c4f7cb4c0e74187fea84d30449472773f0def130d
font_02_sfnt_off00012bbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12BBB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1