Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1db8cbf6971adc1…

MALICIOUS

PDF

71.3 KB Created: 2021-06-26 01:19:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 07b45a23ebf98b48902f93f3ef205ea2 SHA-1: c439a2759017d7f42f780ee03b8fa89a966136ed SHA-256: a1db8cbf6971adc1756cf6b6c2311fbb16fb4a70088da2f679bb16a33123a4fb
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised CMS upload directories and disposable hosting, indicating a link farm designed for phishing or malware distribution. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were extracted, the structure and URL patterns are indicative of a phishing or redirection attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://www.amiunaorchestra.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ae7ef344f33---vivamifimadopabufolujod.pdf
    • http://aimic.com/userfiles/file/muvej.pdf
    • https://celebicatering.com/upload/ckfinder/files/83635120385.pdf
    • https://connect.allianceflooring.net/wp-content/plugins/super-forms/uploads/php/files/722f106824ac6b8f0579c8730ba9356d/971798260.pdf
    • https://aduanaldelvalle.com/userfiles/file/donivapiv.pdf
    • https://inchirieriavioane.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea0bcb0da9---vugemoxuziveri.pdf
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16079b9df6ca61---95473635569.pdf
    • http://africanhairbraidingsalon.com/userfiles/file/85516006802.pdf
    • http://nbpcpentecostalchurch.com/clients/65183/File/16479956048.pdf
    • https://kalatranslation.co.uk/wp-content/plugins/super-forms/uploads/php/files/5k774n808ear7ji4utb2bc162q/20599141780.pdf
    • https://beautyyaurient.com/editor_upload/file/najijevulolofadol.pdf
    • https://roadtoring.com/wp-content/plugins/super-forms/uploads/php/files/5e9465a167318de980a81e078acdabfd/54159342732.pdf
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/16094a1e4ef576---lasaxotefili.pdf
    • http://asea-admin.com/_userfiles/file/20210615193329.pdf
    • https://divorcioconsensual.com.br/wp-content/plugins/super-forms/uploads/php/files/8864bd2d644375e2152911444e147bae/38579061515.pdf
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/m13em38574f8qj494s0i4pbvt1/52409203712.pdf
    • http://manufim.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/16080ed96c574f---kojageditivo.pdf
    • https://bayardplaza.co.uk/wp-content/plugins/super-forms/uploads/php/files/jr3rl94f2lvir1pvnq50qdip5n/wepekoremojoloxizovel.pdf
    • https://baconbites.com/wp-content/plugins/super-forms/uploads/php/files/t5pp7cop5b8c7c81g4830e2np3/70983121245.pdf
    • https://gk-termopanel.ru/wp-content/plugins/super-forms/uploads/php/files/3ad875f81ecc15230795d32e5734cfd7/42722795532.pdf
    • https://gbagencement.fr/uploads/file/zexukaditezivexake.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=the+luck+factor+module+g+answers
    • 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_off0000b47d.bin
348b448e7b5258b862ecea1ccbe8b4ce293c26dc1c39169f5e55c0d120be5024
pdf-font-stream PDF embedded font (sfnt) at offset 0xB47D 15916 bytes
font_01_sfnt_off0000dd08.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD08 16792 bytes
font_02_sfnt_off0000f51f.bin
22689876babc12db88208a726ec92f01f3a93e97dacaa5996ffcc5c525dccc57
pdf-font-stream PDF embedded font (sfnt) at offset 0xF51F 11072 bytes