Malicious PDF — malware analysis report

Static analysis result for SHA-256 56abe359f2734baa…

MALICIOUS

PDF

72.3 KB Created: 2021-08-14 19:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: bc53359c52781e91e1d4a1a41a036b4c SHA-1: 3692bfa80bf355c742ee681e62340a524395dff4 SHA-256: 56abe359f2734baa07808fb1bcb5d49fbe812e9273010e6606202df517d81621
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains a link farm pointing to numerous compromised websites, likely serving as a distribution point for further malicious content. The primary attack vector appears to be luring users to click on these links to download additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160825907ecb31---53084242744.pdf In PDF document text
    • http://bizwd.com/wp-content/plugins/formcraft/file-upload/server/content/files/160764cce71306---67477689663.pdfIn PDF document text
    • http://tradeweb.es/userfiles/file/8448226361.pdfIn PDF document text
    • http://fly.no1-yes.com/userfiles/file/90041940489.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1495d5ea6---vuzovevudoxa.pdfIn PDF document text
    • http://www.norestim.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160ac68dfef6a1---64527040386.pdfIn PDF document text
    • https://interior-mark.com/ckfinder/userfiles/files/85197999824.pdfIn PDF document text
    • http://blog.crowdly.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c09036f404---15919304180.pdfIn PDF document text
    • https://realwebguys.com/wp-content/plugins/formcraft/file-upload/server/content/files/160f9a5c94c825---76309193754.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/9d53f94c9a439e57c8d3c79b5412aeb2/sufadenofewu.pdfIn PDF document text
    • http://mywayrtk.info/userfiles/file/netegofasubupazakevamusem.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/xasazaxomu.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/7119043943.pdfIn PDF document text
    • https://genesislighting.net/wp-content/plugins/super-forms/uploads/php/files/d7781cdc42e548131b7786ff7b0758fd/43549141378.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6ac06a9cde---gulidafedotovebenizojog.pdfIn PDF document text
    • http://clubesquilacoma.com/uploads/files/20084166640.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/kezomulirijiwijuge.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/996ebb97c0051aaf92988e5e26294935/2089652494.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/1607754e223d02---farif.pdfIn PDF document text
    • https://www.hinogas.com/wp-content/plugins/super-forms/uploads/php/files/9c95joighjhfmdl6jg4mab6is2/zarazoguvobedabupe.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/vubekubakakomolab.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=kalabhairava+ashtakam+mp3+downloadPDF 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_off0000b86d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB86D 16048 bytes
SHA-256: 10b3b8baebc03098342a87ca0edbaa755bc7fd3137edcb4812bdb24c82f6c370
font_01_sfnt_off0000e200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE200 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fa17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA17 11072 bytes
SHA-256: 6ff54b6550ad4a6b6e5e3c4e4a6cf3b5e6212d84adf442649041c8adccb21b4e

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