Malicious PDF — malware analysis report

Static analysis result for SHA-256 1eb44e51e608e504…

MALICIOUS

PDF

72.2 KB Created: 2021-06-28 19:25:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: a53b75a58dc9ce303bbcfd34875d48f8 SHA-1: 116a4f28b6d975289b0294f2703c46924999389f SHA-256: 1eb44e51e608e50406462a35af7a957cd5f7b943acecde1e783636af35b5ceca
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to compromised websites or link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of link farms on potentially compromised CMS upload directories suggests an attempt to obscure the true destination and leverage existing infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://firsatpin.com/calisma2/files/uploads/pobile.pdf In PDF document text
    • https://novahealthclinic.ca/userfiles/file/pofenomovaxabekuvabolurum.pdfIn PDF document text
    • https://dprkoreatour.com/uploads/files/dubosugesepisamafip.pdfIn PDF document text
    • http://erdivigado.hu/userkepek/file/34897894706.pdfIn PDF document text
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d32dace9df---zevodimijavum.pdfIn PDF document text
    • https://www.escon.it/wp-content/plugins/super-forms/uploads/php/files/3e025d9c3fefe18211c2c028cb70fa82/daxukulogu.pdfIn PDF document text
    • http://karunb.com/UpLoads/files/58090310073.pdfIn PDF document text
    • https://xn--78-6kce7dfhb9dwb.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/b412d8db07493ad090433fa7dbb5925a/mifase.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16084cc31173f7---50873441984.pdfIn PDF document text
    • https://rhythmcprandfirstaid.com/wp-content/plugins/super-forms/uploads/php/files/10157fddc263a4760055e6cf612ad267/kiwosoxol.pdfIn PDF document text
    • https://anukulagrotech.com/userfiles/file/genetolewo.pdfIn PDF document text
    • http://newgatedesign.com/Images_upload/files/vaxajubepu.pdfIn PDF document text
    • http://am-assets.com/aom/magnolia/userfiles/file/kajoxopipejeruluz.pdfIn PDF document text
    • https://pezenasenchantee.fr/userfiles/file/87702485063.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/19442237393.pdfIn PDF document text
    • http://high-keenltd.com/userfiles/file/janiwoxa.pdfIn PDF document text
    • http://plenar.hr/wp-content/plugins/formcraft/file-upload/server/content/files/16074adf945590---72808769222.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/7bbb0bf27da88bc8bd6eeff3a81ff384/51417510755.pdfIn PDF document text
    • https://fobiy.net/wp-content/plugins/super-forms/uploads/php/files/f020d74df5237c6906d9133b3e1e1c3c/xegaxaguxetokovag.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/9b24fbec9eb142b076e0e116925ed5ae/wibuwunajuredesak.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160717fd0b8949---30003685480.pdfIn PDF document text
    • https://carpanea.it/wp-content/plugins/super-forms/uploads/php/files/5a4aceab83420e4cb49e5ac0962dcc24/81620945723.pdfIn PDF document text
    • https://wentworthre.com/wp-content/plugins/super-forms/uploads/php/files/18f58a3a227ed350a5ddeac52b8f9fce/kabiporeliwaxoxuxej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=slavery+and+secession+worksheet+answersPDF 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_off0000bc31.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC31 15080 bytes
SHA-256: 7d410429b08d91c70dd4aa6952c30bcc79d5e01e9f63a53d8c64487372e2f2c3
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10900 bytes
SHA-256: b6ca75cf6394f074a5d0cc74fec845bfaf45c7886ffb7cac9b713961b95f2b4d
font_02_sfnt_off0000fb81.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB81 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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