Malicious PDF — malware analysis report

Static analysis result for SHA-256 199ded4c7da1d064…

MALICIOUS

PDF

78.9 KB Created: 2021-07-04 09:07:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-08-20
MD5: b31e59f57d5f41a9b491a526505882ae SHA-1: fbed72836957f3934da6557441f4047d64e0f7e3 SHA-256: 199ded4c7da1d06421b86c43fcac8c7450ed832303f3192c869c8dbfb0424f1e
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. The PDF contains numerous embedded URLs, many pointing to compromised WordPress upload directories, suggesting it functions as a link farm to distribute malicious content or phish users. The presence of external URI heuristics and link farm indicators further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://infrive.ru/uplcv?utm_term=how+to+remove+footnotes+from+a+word+document PDF link annotation
    • https://benchmarktransitions.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b610506a227---93240321704.pdfIn PDF document text
    • http://lactopad.com/uploads/files/jateboragitudojopivu.pdfIn PDF document text
    • https://mgogs.com/mgfiles/file/48858787685.pdfIn PDF document text
    • http://teusz.pl/UserFiles/file/53635942154.pdfIn PDF document text
    • http://www.lightingandhvacexpo.com/wp-content/plugins/super-forms/uploads/php/files/7a874c7c804572b4814f758d8e098971/durisog.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-5-19/20210519043033742364.pdfIn PDF document text
    • http://www.tenniscanberra.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160ad5e5c53cde---donogokadudojiwovigo.pdfIn PDF document text
    • https://csom.cz/wp-content/plugins/super-forms/uploads/php/files/1fdf7b4202d874fa5d1186e9df37ece6/9531800284.pdfIn PDF document text
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606f088027721---46301765011.pdfIn PDF document text
    • https://groupunsur1.com/contents//files/3353084945.pdfIn PDF document text
    • http://uyaviation.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b6c696b1087---bopisotaxuwalifimunudizog.pdfIn PDF document text
    • http://musorcentrum.hu/files/article/file/12985761740.pdfIn PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bee707239ed---takigaxu.pdfIn PDF document text
    • https://actor-conseil.com/files/file/26298490110.pdfIn PDF document text
    • https://www.saltriot.com/wp-content/plugins/super-forms/uploads/php/files/77c7c1492a394a870562c5a4f38ba6a7/4246584081.pdfIn PDF document text
    • http://bjhtdszdh.com/v15/Upload/file/2021621201366024.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1608298647df70---91442089097.pdfIn PDF document text
    • http://petrduchek.com/files/29189372686.pdfIn PDF document text
    • https://www.nordatec.com/wp-content/plugins/super-forms/uploads/php/files/lmpdhtt1ftehomeljheeglf8ms/bisokebu.pdfIn PDF document text
    • https://www.helpfulhunks.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/160a3dbcd7da53---64699347452.pdfIn PDF document text
    • http://apsons.eu/files/file/mafukidinafosiw.pdfIn PDF document text
    • http://dailitara.lt/bites/uploads/file/gamuravubenujusurew.pdfIn PDF document text
    • https://www.westcountrystoves.co.uk/wp-content/plugins/super-forms/uploads/php/files/217070662a6a64ba732d661aebbd09ef/88358003087.pdfIn PDF document text
    • 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_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e9e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9E9 10740 bytes
SHA-256: 771253f874f2a17ca11f673a2be53f5703dce9bc0e717adb7e7fd8ed3f9e08ff
font_02_sfnt_off000102b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102B1 16636 bytes
SHA-256: 69b69cc2e939b56f7b5e341963e5062067a3680d5e55f212c5ebcc2d6e28a72d

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