Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8032633df14ca5e…

MALICIOUS

PDF

71.1 KB Created: 2021-09-19 05:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: c6405f6a1bb16066f17633d2001a8787 SHA-1: b2de6939c82f13b8cc91464bdf0019c5bb8ffa81 SHA-256: b8032633df14ca5e5b98253f8c079990e1ec07e6a0edc5a9daf124f13c4f8f5f
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to compromised CMS uploads and disposable hosting domains, indicative of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware delivery. The file's structure and URL patterns align with common tactics for distributing malicious content via indirect links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://nomylo.ru/uplcv?utm_term=the+strange+case+of+benjamin+button+pdf PDF link annotation
    • http://daiduongmetal.com/uploads/ckfinder/files/43307780625.pdfIn PDF document text
    • http://nikolabartakova.cz/files/file/senowodaturuwom.pdfIn PDF document text
    • http://shrlie.com/upload_fck/file/2021-9-3/20210903145207392620.pdfIn PDF document text
    • https://atlasautoglass.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130c030bb7c8---24928319648.pdfIn PDF document text
    • https://pratham.one/file/zuxux.pdfIn PDF document text
    • http://hardiebase.com/uploads/assets/filefile/penodabexanibebevi.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/gunubazaguvopuvafuzol.pdfIn PDF document text
    • http://aldobini.it/userfiles/files/80488566928.pdfIn PDF document text
    • https://www.kiakaha.gr/wp-content/plugins/super-forms/uploads/php/files/n95tes3ogv646aeka11o9glh51/16157202132.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/jrk03lq31do1abg2cugbv2i7i0/mebasabuxusov.pdfIn PDF document text
    • http://chaitraglaze.com/uploads/84888718660.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/92729889422.pdfIn PDF document text
    • https://magicdiscoradio.hu/userfiles/file/kozuzitidozezibaxude.pdfIn PDF document text
    • http://kingswaytyres.com/project/kingsway/uploads/file/5711757367.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/lobukorixivekukutumo.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16145130d1bf91---70600355027.pdfIn PDF document text
    • https://natinsel.com/imagenes/file/84847204986.pdfIn PDF document text
    • http://ps-chiptuning.hu/userfiles/files/67510951381.pdfIn PDF document text
    • http://cp-tournament.org/ckfinder/userfiles/files/72367903364.pdfIn PDF document text
    • http://sotel-perm.ru/site/file/zajawadigovubegibakef.pdfIn PDF document text
    • http://519pf.com/userfiles/files/vokedugaxolekuxuzupi.pdfIn PDF document text
    • https://lapdonline.org/file/41025576460.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_off0000b545.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB545 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cd5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD5C 11352 bytes
SHA-256: 790e13818a1ca735f90e95c598ce55416f6336222a1567e305ccedc97bbe7a36
font_02_sfnt_off0000e776.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE776 15440 bytes
SHA-256: 4ab87c406dac902129990ac1817167c1ddc01781614e49d765f20118c09eb0f9