Malicious PDF — malware analysis report

Static analysis result for SHA-256 e81dff43b0cae07f…

MALICIOUS

PDF

76.1 KB Created: 2021-09-15 03:43:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 592bf5cee7536952467c0003d322be8f SHA-1: dd9be5391179b568d53809d0ce2fc2ae0e571c52 SHA-256: e81dff43b0cae07f2e05da6988e1791f5c59711f25f287b18339fd2c0abed9be
156 Risk Score

Malware Insights

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

This PDF was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous links, many pointing to compromised WordPress sites and other domains, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lead the user to a site that likely hosts further malicious content or phishing forms.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.oasipizza.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e69f88ab30---rosumomilijuv.pdf In PDF document text
    • https://clinicamanila.com/ckfinder/userfiles/files/56176804028.pdfIn PDF document text
    • https://provisionsinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/161413e5fa8eb0---72471019644.pdfIn PDF document text
    • http://cancercareresearch.com/userfiles/file/9475679602.pdfIn PDF document text
    • http://sbriz.ru/userfiles/file/zeluzoxokifadufavusi.pdfIn PDF document text
    • http://www.lentilles-progressives.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16132755f806d8---metedabinafinaxipofu.pdfIn PDF document text
    • https://protectname.xyz/whoisprivacy/userfiles/files/galusawibubu.pdfIn PDF document text
    • http://sinoorchids.com/image/file/widixav.pdfIn PDF document text
    • http://artediapharma.com/upload/files/medopetefokazekoxonu.pdfIn PDF document text
    • https://mandarinusa.com/userfiles/file/1631397457.pdfIn PDF document text
    • https://ezsprinting.com/userfiles/file/nupopevonajotifudo.pdfIn PDF document text
    • https://tpk-m.ru/files/file/63619998863.pdfIn PDF document text
    • https://k9-warrior.com/wp-content/plugins/super-forms/uploads/php/files/cptiil0kj8ptehjlal6rm9mi1s/54915419158.pdfIn PDF document text
    • http://randygordonlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xolepowodevodabem.pdfIn PDF document text
    • https://mallorcaboom.com/res/wysiwyg/file/sibakukifuwuge.pdfIn PDF document text
    • http://andreagarciam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161410dd422e8d---gowijederuxuzopo.pdfIn PDF document text
    • https://atasuorganiktarim.com/upload/ckfinder/files/75504942897.pdfIn PDF document text
    • https://moulindelarroque.com/userfiles/file/36897150283.pdfIn PDF document text
    • http://alltimescare.com/attachment/files/wutoxi.pdfIn PDF document text
    • https://humanistbeauty.com/wp-content/plugins/super-forms/uploads/php/files/5v0q3vq8ub7ho13hg7i32ub5q8/kiwaxulubipese.pdfIn PDF document text
    • http://1mosref.ru/ckfinder/userfiles/files/56512252976.pdfIn PDF document text
    • http://www.kidnuri.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b2381a89c8---refinuvepazimu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=redmi+note+9+camera+tips+and+tricksPDF 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_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD7A 17176 bytes
SHA-256: 387e858aea8f002b244b1ada8e32466207d22935fc32740066dd9fae9c664750
font_02_sfnt_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 10932 bytes
SHA-256: 4c84292f62b31af4cf6daa84426ab40c409b23ef53eba7419e22cf59bf1bc11a

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