Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c13350a0c2670f5…

MALICIOUS

PDF

73.1 KB Created: 2021-09-08 08:18:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 13220c3db01efb01f704702500e20d7a SHA-1: 182934a8344931b412aec4673134cb39518495ce SHA-256: 5c13350a0c2670f5d4e445830385cc37ea7cabcc93e49a382ebcd9932b4db845
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics reveal it functions as a link farm, directing users to multiple compromised websites hosted on potentially disposable infrastructure. The presence of external URIs and link farm indicators suggests a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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 http://www.kmclogistics.com/wp-content/plugins/super-forms/uploads/php/files/02dc4d7e502ff5158025cebfca6bcd99/33487717068.pdf In PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/16a3e17c93b02f113ac0f64d63c8ab02/vijezidamajajisojepem.pdfIn PDF document text
    • http://limpiasol.com/wp-content/plugins/formcraft/file-upload/server/content/files/160869b6217fc4---67399630453.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/160758c5aa7fb3---bevezevojarevomopawuwasa.pdfIn PDF document text
    • http://easyreturn.store/userfiles/file/tarava.pdfIn PDF document text
    • https://charqueadaboavista.com.br/wp-content/plugins/super-forms/uploads/php/files/4f697aecaaa1d1a5639aaeb9d0036374/wonazanofigaduvom.pdfIn PDF document text
    • http://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/1606fa2bccb49f---fasakomobowozumotezeku.pdfIn PDF document text
    • http://oilmachineydy.com/d/files/piruxozitipuna.pdfIn PDF document text
    • http://bulgankhangai.mn/userfiles/files/vanunonajevezudidelaxawo.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/28284913374.pdfIn PDF document text
    • http://etcad.net/np/upfile/file/sebidalapipuvaduto.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/16077cb644f3cf---menuxon.pdfIn PDF document text
    • http://exito-opakowania.pl/userfiles/file/guxuf.pdfIn PDF document text
    • https://home18.ru/wp-content/plugins/super-forms/uploads/php/files/9a036764589c32bbab45846988a153c4/87575051355.pdfIn PDF document text
    • http://vogiantinhmach.com/media/ftp/file/peluzemuvofeluz.pdfIn PDF document text
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/c9af4dfe432192fed69a92a2410b8b77/wipesa.pdfIn PDF document text
    • http://pampa.be/uploads/userfiles/files/pokupirodalirenidol.pdfIn PDF document text
    • https://aawyx.com/sites/default/imageuser/file/67380797953.pdfIn PDF document text
    • http://vuatoyen.com/uploads/userfiles/file/paxakazudabekukonajij.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/1ea0d0fe3f8c5097d22a427849219677/64675738223.pdfIn PDF document text
    • http://sugarfree-gelato.com/upload/file/53887327127.pdfIn PDF document text
    • http://parkwestresidences.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0ae0d8885c---xoloj.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=cfa+level+1+books+pdf+free+download+2018+schweserPDF link annotation
    • 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_off0000b8ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8CE 11444 bytes
SHA-256: 0d6f0f7104221787b9d1861f7901691103ddcbf657eb0e823bc2d5f09b4aa6e2
font_01_sfnt_off0000d3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ebce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBCE 16768 bytes
SHA-256: 31bb3e0e00d63adc535bb01a11ffdf31244d2fa26d2cc319a9bcd8df6066719a

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