Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd7fdde79150aad7…

MALICIOUS

PDF

91.1 KB Created: 2021-09-01 18:24:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f293804826523c78434ce3924f553e7d SHA-1: b9a88247b3996c34f97e194c1f0fdaaffccf4c04 SHA-256: fd7fdde79150aad70ec6991963c433ebd8c2b0eb130634f288a2560c83d9ad67
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a link farm designed to redirect users to potentially harmful content. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://kawanmto.com/contents//files/76215638240.pdf In PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-6/20210506183144143597.pdfIn PDF document text
    • http://studio70.eu/userfiles/files/15170853271.pdfIn PDF document text
    • https://autoschiller.de/wp-content/plugins/formcraft/file-upload/server/content/files/160ff31b840f2e---mutuvuv.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160967fd6f28e2---58579366188.pdfIn PDF document text
    • https://www.actionconstructionjax.com/wp-content/plugins/super-forms/uploads/php/files/e410520c72cca82e1e01849c47ca2fb5/bozowexunulugomidafet.pdfIn PDF document text
    • http://chronicles.ae/userfiles/files/dubufizidotituzemidorep.pdfIn PDF document text
    • http://cukiernia-waltar.pl/qcms/userfiles/file/luwidad.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a6af759787b---96462018267.pdfIn PDF document text
    • https://linhngapt.vn/upload/files/7326766729.pdfIn PDF document text
    • http://nsfeed.com/_UploadFile/Images/file/futuzuwinare.pdfIn PDF document text
    • https://topupdana.com/contents//files/bepedisatitupezekisabobus.pdfIn PDF document text
    • https://militarynetwork.ca/wp-content/plugins/formcraft/file-upload/server/content/files/16071bc9260e75---14974386294.pdfIn PDF document text
    • http://minerva-collection.net/files/files/23651130555.pdfIn PDF document text
    • http://enjoy.sk/editor_uploads/system/files/gilareserake.pdfIn PDF document text
    • http://adhdadvisory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16072549edc335---51911324610.pdfIn PDF document text
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/t6k86gps3adprjjg65rtgfhhbg/kukutumebavuf.pdfIn PDF document text
    • https://www.gsccn.it/wp-content/plugins/formcraft/file-upload/server/content/files/1609782fb15efc---dijatexodanuvep.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/d659a3c349c72c2225cef36f33c7cb4c/30122245867.pdfIn PDF document text
    • http://9meclinic.com/ckfinder/userfiles/files/detasexojawuxi.pdfIn PDF document text
    • http://suachuaspa.com/upload/images-content/files/judonikimorivop.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090a15d42d91---38575465206.pdfIn PDF document text
    • http://diodelumi.com/ckfinder/userfiles/files/japikotugebumiloweb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=persuasive+person+meaningPDF 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_off0000fc67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC67 18996 bytes
SHA-256: e81912cd7cde59d8701ddb10a028284517ee60f1577bc42405a4e7db7c275064
font_01_sfnt_off00012da5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12DA5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000145bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x145BC 10616 bytes
SHA-256: 710ad67de8c41d625bd187dabf877685e48806e328e27f0f7313ca95404d9769

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