Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d334ab16dc8a63c…

MALICIOUS

PDF

81.6 KB Created: 2021-09-07 09:47:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 5a4f92dfdd2537c69100e94036d859b7 SHA-1: 4745d962d5d4b7d4d948beaad8c75ee87ce03135 SHA-256: 6d334ab16dc8a63cf17fa9bfd26a4a51916182a3df1f419b85cdca5cafd3f486
164 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. The PDF contains numerous links to external sites, many of which appear to be compromised WordPress installations, suggesting a link farm designed to host or redirect to malicious content. The 'SE_INVOICE_LURE' heuristic further supports that the document is intended to deceive users into downloading a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://suportti.com/wp-content/plugins/formcraft/file-upload/server/content/files/16070c67c5f375---rogasezururaw.pdf In PDF document text
    • https://congtydaihai.com/upload/files/55764235333.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/160703cc9f04dd---5654356300.pdfIn PDF document text
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/2562b110abc3f91925c068c572c85112/56148140052.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a3a0d244a9f---pukazanonike.pdfIn PDF document text
    • http://www.fotografoeventimilano.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a3b8c159c1---69192269544.pdfIn PDF document text
    • http://rogersdesignhouse.com/uploads/files/50894309960.pdfIn PDF document text
    • http://kleinschadenexpert.de/userfiles/file/14507055618.pdfIn PDF document text
    • https://airflow-skateboards.com/upload/file/nukunemekakubinesofibera.pdfIn PDF document text
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16097116b850fe---wipobi.pdfIn PDF document text
    • http://spiregene.com/image/files/20210705_110221.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/tamikakosakodaku.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/1315d277dfabd8e3d9318dfbaca9df2c/17684695414.pdfIn PDF document text
    • https://www.officinadelgustoroma.com/wp-content/plugins/super-forms/uploads/php/files/0a7660362e6984c54d6b10eb821761bc/80896248620.pdfIn PDF document text
    • https://asiarsolutions.com/userfiles/file/9533581941.pdfIn PDF document text
    • https://shared401k.com/wp-content/plugins/super-forms/uploads/php/files/ae9ee3337c5015bbadb1020418126f9a/18269654672.pdfIn PDF document text
    • https://nam.it/wp-content/plugins/formcraft/file-upload/server/content/files/160a66e5758686---kibimejinopa.pdfIn PDF document text
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cc5fda3735---katis.pdfIn PDF document text
    • http://pc75.net/upfiles/file/1624736684.pdfIn PDF document text
    • https://radio-aurea.eu/files/file/60554957987.pdfIn PDF document text
    • http://mackielaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/niderekoxibagobu.pdfIn PDF document text
    • http://architettotamborra.eu/userfiles/files/nefexolerusopimuvop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=ignou+assignment+acknowledgement+slip+pdf+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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 19100 bytes
SHA-256: b1488c3e49d4034ed8ac7b1cad7edc6fd519ed7210bba9f1ff4f05db5583e42d
font_02_sfnt_off00011f0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F0E 11092 bytes
SHA-256: 8796638d13a7d358b8ddc2d758a206a11e9a89726c0cb4f68354d0c6a0f5ae18

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