Malicious PDF — malware analysis report

Static analysis result for SHA-256 a173c3c5195cb57d…

MALICIOUS

PDF

85.1 KB Created: 2021-10-12 02:24:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: d424686fda9b5a184610a0af0f948cd4 SHA-1: 69c2a16d196f76d3487a9013c34a4c7054e03c80 SHA-256: a173c3c5195cb57d9b4170727ee9b5c0d81393bdf75d1da3d158236b47a6d2ce
204 Risk Score

Malware Insights

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

This PDF file contains embedded JavaScript and multiple external links, several of which point to compromised WordPress sites or disposable hosting, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving the download and execution of a second-stage payload via the embedded script and URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 8

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613405ea88fc2---48980293892.pdf In PDF document text
    • http://dobre-jaja.com/Upload/file/63020019771.pdfIn PDF document text
    • https://chinatupai.com/web/js/ckfinder/userfiles/files/26289754847.pdfIn PDF document text
    • http://d-a-s.cn/userfiles/file/80313192853.pdfIn PDF document text
    • http://ekonomiyonetimivepazararastirmalarikongresi.reklam.cc/FCKeditor/editor/filemanager/connectors/userfiles/file/59761446560.pdfIn PDF document text
    • https://kemxoi.vn/app/webroot/files/images/pages/files/xuwitunigilajefonupababak.pdfIn PDF document text
    • http://silverk.ru/img/lib/file/11307765551.pdfIn PDF document text
    • http://planao.com/ckfinder/userfiles/files/82568449816.pdfIn PDF document text
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613e5f360ae40---58731586669.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/736f89f0ce89f80f7c4de0f33055cc34/tuvelimujibax.pdfIn PDF document text
    • http://conditum.nl/userfiles/file/lagesupijugolinusodozen.pdfIn PDF document text
    • https://helices-evra.com/userfiles/file/fetarejunove.pdfIn PDF document text
    • http://dragonera.cn/admin/userfiles/file/60427768837.pdfIn PDF document text
    • http://packagingandfoodmachinary.com/userfiles/file/fowulalinukupabetab.pdfIn PDF document text
    • https://estoniapools.com/contents/files/nosapozexuwoxopuponono.pdfIn PDF document text
    • https://basundharamart.com/userfiles/file/texiwopubusok.pdfIn PDF document text
    • https://sluganarodu.org/userfiles/files/gumezepadaraj.pdfIn PDF document text
    • https://www.etbsupplies.com/wp-content/plugins/formcraft/file-upload/server/content/files/16162dbe944863---nafexaduxaloziwoberi.pdfIn PDF document text
    • https://shieldtech.cz/ckfinder/userfiles/files/33120332717.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/040825579265.pdfIn PDF document text
    • http://gmei.lt/ckfinder/userfiles/files/85299262132.pdfIn PDF document text
    • http://quartierdete.fr/uploads/fckeditor/file/lufisarobezekupar.pdfIn PDF document text
    • https://toscanafantastica.com/userfiles/file/37339192897.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/BGAemAmcdTc/uplcv?utm_term=middle+finger+sign+meaningPDF 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_off0000e6f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6F6 18648 bytes
SHA-256: ffdf1880e9aa1b722a7778feba2ecb8c13767798dd8b8e1b6404d77d15c5a078
font_01_sfnt_off0001174c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012f63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F63 10472 bytes
SHA-256: 3e2fd1556d1b2cb350578be1fd50782c5434bb4439708f8ac62d26c5dc0152e7

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