Malicious PDF — malware analysis report

Static analysis result for SHA-256 f7dfa0f3e59db75b…

MALICIOUS

PDF

91.8 KB Created: 2021-08-03 08:15:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 33df8b7baf34d7d14774bef5a1f3c75f SHA-1: 73a047644efec42ab15a8a7d13b1e41abe99ddce SHA-256: f7dfa0f3e59db75bb9c24a58fecaf1de533f4a34a77880e4b6cd59fc75ca0144
164 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous URLs that point to potentially compromised CMS uploads and disposable hosting. The presence of a 'download button' lure further suggests an attempt to trick users into downloading a payload. The overall pattern points to a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://oniceh.ru/uplcv?utm_term=comparative+and+superlative+worksheet+grade+4 PDF link annotation
    • http://www.iamgoingto1996.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a7f66c4bbc6---gorapizik.pdfIn PDF document text
    • https://discoverapartmentsforrent.com/wp-content/plugins/super-forms/uploads/php/files/a9ab65173b2f5f17efc5ea3c2c5d317f/62049476978.pdfIn PDF document text
    • http://christembassydocklands.org/wp-content/plugins/super-forms/uploads/php/files/efeb87c8b74cbe713bd99f310bd81fc4/kipilufipowapodapibetal.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161058eb65153c---38825405582.pdfIn PDF document text
    • https://fulzugaskozpont.hu/files/tusafusiporizidanufuf.pdfIn PDF document text
    • http://immobiliareborghi.com/userfiles/files/suwuwimelapugenavipa.pdfIn PDF document text
    • http://abnicum.com/files/file/xasabolaxamivojosukevif.pdfIn PDF document text
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/bhs3o6oaejorhicm3iv5gfp24g/gotemazoxonurasalir.pdfIn PDF document text
    • https://canadiancontractorservices.com/wp-content/plugins/super-forms/uploads/php/files/ke9aj7eriog60evi5ttcts5ot3/30564625411.pdfIn PDF document text
    • https://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/1luun0ns5a2uuj2gth2nf1u2tr/4888578756.pdfIn PDF document text
    • http://joshuadacosta.com/wp-content/plugins/formcraft/file-upload/server/content/files/16092015d5798d---xefusazoseri.pdfIn PDF document text
    • https://primeodontorj.com/wp-content/plugins/super-forms/uploads/php/files/8df69b2d94c6ce1f88d0eac196953698/xejenuf.pdfIn PDF document text
    • http://metaglas.kr/userData/board/file/muvopoxaxaxaxabesuje.pdfIn PDF document text
    • https://angkoronetour.com/userfiles/file/xoledabaxenowagaxirezufik.pdfIn PDF document text
    • http://tulsacentral1963.com/clients/3/39/398188050227c7f1c8b3045a0a865105/File/73701510180.pdfIn PDF document text
    • http://shengyaweb.com/uploadfile/file/2021072413024578.pdfIn PDF document text
    • http://www.rec39.ru/wp-content/plugins/super-forms/uploads/php/files/a93da59f78eb16369da79e755fbd92be/wurepasepakebel.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1607d05fcd60d6---98973503846.pdfIn PDF document text
    • http://snap-drone.com/userfiles/file/runawuxaf.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/4af7d272700e12880e48467787ce5878/78735043476.pdfIn PDF document text
    • http://www.marcelasemper.com/wp-content/plugins/formcraft/file-upload/server/content/files/160858bc1aa1fc---najamagelavadoluvokilusa.pdfIn PDF document text
    • https://vibangnhadat.com/uploads/files/fepirefuxuzi.pdfIn PDF document text
    • https://promobryansk.ru/userfiles/files/51711681674.pdfIn PDF document text
    • http://pantryscan.com/123cars/imagefck/file/bizenomubidugubanixapuw.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_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000115d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115D8 18432 bytes
SHA-256: 68691bf991c6a69393730cf13cad46d4590a6fff772df41bf7c4e4e9cc7930f9
font_02_sfnt_off00014659.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14659 11292 bytes
SHA-256: a5c11c4c43e2fc953ee50ce6c1219f164c9efd783c5c33d1112be7cd395bedb6

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