Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4941c7eb61e8afa…

MALICIOUS

PDF

78.0 KB Created: 2021-07-22 00:57:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1da678ec85dc417d05f623cedf524437 SHA-1: 364e9ef6c814fde6b081722764089c5a99d6de87 SHA-256: c4941c7eb61e8afaaf5d1d3d7454f3a6dd5c3c88f7c4b0151a36f97877189128
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous links to external resources, many of which point to compromised CMS uploads or disposable hosting, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the nature of the heuristics indicate that this document is designed to redirect users to malicious sites, likely to download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://aquamedicasatumare.ro/ckfinder/userfiles/files/26677383048.pdf
    • http://cba60.com/clients/6/6c/6c2dd71b6188bc8e8f5adc6209c6f86c/File/5022519867.pdf
    • https://soechi.com/userfiles/file/lilavad.pdf
    • http://dbjhockeytournament.com/clients/f/f9/f9ff496842c877cbb4522510b668f2a2/File/51104455914.pdf
    • http://pritchardreunion.com/clients/81409/File/xonotesij.pdf
    • http://serdceprirody.ru/userfiles/file/52801247081.pdf
    • http://grupogmec.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607ed235e30e5---36496993337.pdf
    • http://artistalexanderkanevskywinnerinternationalaward.com/clientMedia/file/42753192611.pdf
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607ead7a40117---71948262943.pdf
    • http://zenithmetals.com/files/sulexoximozolovoza.pdf
    • http://sanders-scottfamily.com/clients/26926/File/rotogolakot.pdf
    • https://www.hdcorp.com.br/wp-content/plugins/super-forms/uploads/php/files/nsbvrubrdr8chl04eia6cavesf/35082287083.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c96c7381f8e---58890157585.pdf
    • http://www.petercar0937494634.com/upload/img/files/37983932860.pdf
    • https://www.heainc.com/wp-content/plugins/formcraft/file-upload/server/content/files/16082683965823---76638081534.pdf
    • http://talentpetroleum.com/userfiles/file/90740675586.pdf
    • http://mlsconsulting.net/cms/files/File/64038856996.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/omgbel5nvdagd4123ebj9hc7nh/fojulawezadururalenik.pdf
    • https://alsterparkett.de/wp-content/plugins/super-forms/uploads/php/files/7m73nfphiiekfgfq9v01il59ck/32049640631.pdf
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160aaf8bad656e---surufavulewo.pdf
    • http://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073fe044f553---66352554430.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=red+dirt+reloaded
    • 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_off0000d009.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xD009 16792 bytes
font_01_sfnt_off0000e820.bin
0f64f85013c9e1bcf8f53d198a46a564a41f2578524538915062eba32c44813d
pdf-font-stream PDF embedded font (sfnt) at offset 0xE820 10012 bytes
font_02_sfnt_off0000fe6c.bin
4db354cc8e752e77f67c326b4f0143a7bf50a80c14381e7c32ad1b8898ab23a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xFE6C 16632 bytes