Malicious PDF — malware analysis report

Static analysis result for SHA-256 38504666f0617e5b…

MALICIOUS

PDF

83.5 KB Created: 2021-09-05 05:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: a782f94d8e2c42cc30bf113aab7718af SHA-1: a9544b895d90fb4707428f0c31b9154fff249d81 SHA-256: 38504666f0617e5b8488ac43ee8dc113aaeab0e24f072f947d2a1e914af278ff
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of links pointing to other PDF files hosted on various websites, many of which appear to be compromised. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were explicitly extracted, the structure suggests a link farm designed to lure users into downloading malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c4543981229---bozagit.pdf In PDF document text
    • http://pr-jam.com/ckfinder/userfiles/files/jaxufiwawese.pdfIn PDF document text
    • http://redigonda.it/userfiles/files/soratelijewupul.pdfIn PDF document text
    • http://www.naturhalles.fr/fckeditor/userfiles/file/67652684097.pdfIn PDF document text
    • http://myphamhelios.vn/luutru/files/jediwuniwosuf.pdfIn PDF document text
    • https://heykidsletscook.info/wp-content/plugins/super-forms/uploads/php/files/67c141cbb769664040a410ce64addc4d/83913040564.pdfIn PDF document text
    • https://www.alongsideasia.com/wp-content/plugins/super-forms/uploads/php/files/7e38bce9c694fafc41977274e6815ce6/19370546627.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/6796a4db6249221b03f2bd4a483c2e5a/17906765498.pdfIn PDF document text
    • http://frangarcia.eu/upload/file/lirosele.pdfIn PDF document text
    • http://td-mg.ru/uploads/files/79223087038.pdfIn PDF document text
    • https://rosemonttherapy.health/wp-content/plugins/super-forms/uploads/php/files/qp3ibs501lq30umpu48qv0n91f/rodutamixirez.pdfIn PDF document text
    • http://musicandyouapp.com/webupload/editorimg/files/44662837378.pdfIn PDF document text
    • http://carroll1975.com/clients/4/4e/4e2b018d07aaa5a30c3e4fca1c7a8df7/File/sefewitofemozotamubo.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8865046c26---vexefatuwupibamuzota.pdfIn PDF document text
    • https://eravukappalpalli.com/userfiles/file/sugosupulefaneputufa.pdfIn PDF document text
    • https://fuchscars.com/wp-content/plugins/super-forms/uploads/php/files/b2b535c4b3284d2dd345980e8e8e10fb/nigut.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/61972152908.pdfIn PDF document text
    • http://ineke-ott.nl/keramiek-beelden-imagesfile/wolotexewoleletiz.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/fikuzurisixuxeno.pdfIn PDF document text
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607c758b268bb---67775332648.pdfIn PDF document text
    • https://yarsan.ru/wp-content/plugins/super-forms/uploads/php/files/1835c7cccffa4f8598805ed97b78077e/gefidejejoliwalutiwunibuj.pdfIn PDF document text
    • https://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/k5rv7eu40qida4qrkosb3nkvbk/92859943191.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=mi+band+2+manual+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_off0000deac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEAC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f6be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BE 19468 bytes
SHA-256: b63fbfc9b6ad501e5a981c07e4f5907e3421f387cb70aa5345cf7161ec939bd5
font_02_sfnt_off0001295c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1295C 10396 bytes
SHA-256: 7b859e8d11d99210ade9bc46d524fbd8734eca4588decfe76529d7c80176443c

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