Malicious PDF — malware analysis report

Static analysis result for SHA-256 343caf4085fb23ed…

MALICIOUS

PDF

78.7 KB Created: 2021-09-07 17:32:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 6bf0ff58bddfbc39cdff9e08bb9cee44 SHA-1: 777c35c1be44f9ca74a4c93d31369f4d1a4f6661 SHA-256: 343caf4085fb23edf89eea838844555c88f302534aa9f1767bc63a3bffb38cf4
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, suggesting a link farm designed to redirect users to malicious content. The presence of these links indicates an attempt to lure victims to external sites, likely for phishing or malware distribution.

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 http://expertsystemgroup.com/file_media/file_image/file/lorumalolilulituvexesemel.pdf In PDF document text
    • http://cohn-vossen.com/wp-content/plugins/formcraft/file-upload/server/content/files/160722bff2eac6---51899485332.pdfIn PDF document text
    • https://landi-bg.com/images/file/42243488664.pdfIn PDF document text
    • https://drahmetbostanci.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e6e9c773ba---bufavusowojexaredamiv.pdfIn PDF document text
    • https://www.thecandystoresudbury.com/wp-content/plugins/super-forms/uploads/php/files/67tajl7j43j38ver8hk4l8059l/zokuxeberodazosexejulewu.pdfIn PDF document text
    • https://www.nestroots.com/wp-content/plugins/super-forms/uploads/php/files/s3af1l7l45063dcft3jd6l1ou5/36273896901.pdfIn PDF document text
    • http://thestarbusan.net/FileData/ckfinder/files/20210828_0CC6882C11FD8135.pdfIn PDF document text
    • http://xn--80age2amlc.xn--80adxhks/pics/images/file/fusutigox.pdfIn PDF document text
    • https://prana.video/wp-content/plugins/super-forms/uploads/php/files/7g9mcn6cmlsdrug9gg30l1jjr3/donudawoduguzupe.pdfIn PDF document text
    • http://litho-and-co.fr/ckeditor/upload/files/fovido.pdfIn PDF document text
    • https://www.dynasil.com/wp-content/plugins/super-forms/uploads/php/files/3ef06d20479b9324d758ad6be9728c72/diresuruparukinuzinur.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/16099e38ebe521---satevoxux.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/okrimh2tr1tp9fe6cho3k3ast2/duwamajasafomufijit.pdfIn PDF document text
    • https://www.certificagreen.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c87dc1ff54---tubalojojurekemewamazaba.pdfIn PDF document text
    • https://partroyfuneralhome.com/partroy/assets/file/35940126989.pdfIn PDF document text
    • http://www.blackhillsdancecentre.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f785a0bceb---sejukizaguzowuxulex.pdfIn PDF document text
    • http://stpatricksreunion.com/clients/84553/File/89159060601.pdfIn PDF document text
    • https://aradovan.com/userfiles/file/katawi.pdfIn PDF document text
    • https://mdteam.se/ckfinder/userfiles/files/4104864412.pdfIn PDF document text
    • http://inannamsao.com/uploads/files/58706608058.pdfIn PDF document text
    • http://humanlitech.com/files/files/15134777080.pdfIn PDF document text
    • http://hanbangrd.com/userfiles/file/20210805102023_2136184495.pdfIn PDF document text
    • http://faulkfamilync.com/clients/c/cc/ccb94402b1eed20a0583117be0c0b506/File/zarobavadatole.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3vuEKuznOb8/uplcv?utm_term=afman+36-2203+pdfPDF 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_off0000cddc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDDC 10500 bytes
SHA-256: 14d2877087b78e58263051fd2e585ca9c12cd5689f253f94ca9063a894b44dc7
font_01_sfnt_off0000e5ca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5CA 18128 bytes
SHA-256: d95f2cb9197759e3b3547be812e9ffd2c084cea907fb188afdf34e1403858c30
font_02_sfnt_off00011469.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11469 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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