Malicious PDF — malware analysis report

Static analysis result for SHA-256 3784188cbf283973…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 11:05:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 1a18c3b29b2bfc55331ca6dbf39bf790 SHA-1: 067455ef060d1fe9edcbae182e3e807ebad56d5c SHA-256: 3784188cbf283973bcd12b5e4e65ad6635895da08e45de985d09016a96eb167c
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. Heuristics reveal it functions as a link farm, directing users to compromised WordPress upload storage and other potentially malicious sites. The presence of numerous PDF links and the use of UTM parameters suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://hhsmelt.com/upload/files/71954705100.pdf In PDF document text
    • https://kocarbonag.com/luutru/files/dowajab.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/xarawajofedidodabifoxet.pdfIn PDF document text
    • https://www.iieng.org/editor/ckfinder/userfiles/files/vagejokegaxolakezatupura.pdfIn PDF document text
    • https://illustrations.noche.fr/images/files/nalafokoxobara.pdfIn PDF document text
    • https://dmshospital.com/mm_engg/files/teferipowadogokuwoxidola.pdfIn PDF document text
    • http://kht.civilkozpont.hu/uploads/file/nebafirobesele.pdfIn PDF document text
    • https://nissanzorba.ro/ckeditor/ckfinder/userfiles/files/xufoxisebedo.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/pafagasujadunakozomolib.pdfIn PDF document text
    • http://commandhousecreations.com/uploads/files/kumusimubemit.pdfIn PDF document text
    • http://aroma-es.red/yamituki-n/uploads/files/jetepojatojuto.pdfIn PDF document text
    • http://ilovestory.com/upload/file/62876749596.pdfIn PDF document text
    • http://theseadiaries.com/ckfinder/userfiles/files/92380165650.pdfIn PDF document text
    • http://metabolitplus.ru/files/file/39787677477.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/161413790a6fd9---45171383775.pdfIn PDF document text
    • https://swiz.eu/files/editor/labojakejanakafiburivaji.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/87441856380.pdfIn PDF document text
    • http://kgmda.com/upload/files/vutewi.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16137f2b1052e6---81711836164.pdfIn PDF document text
    • http://mebco.ru/images/file/xazujenepekabepitof.pdfIn PDF document text
    • https://taptigrihnirman.com/singhania/downloads/file/gagerixubigev.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161408c867befc---rejupurozotoda.pdfIn PDF document text
    • http://libron.pl/fckupload/assets/file/19963188208.pdfIn PDF document text
    • http://alpha-cp.com/userfiles/file/lopiradalirunogudak.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=installare+certificato+androidPDF 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_off0000cfca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFCA 17240 bytes
SHA-256: 44067ec77d338ad5f2bacaa560478bc145979f79ef1aafa2f05793878ab1ac22
font_01_sfnt_off0000fc8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8C 10420 bytes
SHA-256: 6c18f86b43ad79f340fbfaceedfa190943bb1499de7670bb38f825cb4bf325b3
font_02_sfnt_off00011444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11444 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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