Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b4d1df0465313b8…

MALICIOUS

PDF

86.6 KB Created: 2021-07-18 17:25:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 992de2388e220de024a2ae46ea2e59b7 SHA-1: 699f8473874f877c05a0bba42503d213ebaa0585 SHA-256: 6b4d1df0465313b8dad186a47ad09202a56d4a33182d0dea09160d45d66a90fa
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a link farm pointing to various URLs, including one with a raw IP address, suggesting an attempt to redirect users to malicious content or phishing sites. The ClamAV detection and ML classifier further support its malicious nature, likely as a phishing or malware delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9848

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160a931f5126b7---wuforodex.pdf In PDF document text
    • http://starlightskiothon.ca/clients/4/44/44db284a3a4a6a3f34f8f2fa71918f98/File/1419696605.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609f43df1c0ec---ritebitaf.pdfIn PDF document text
    • http://104.156.58.56/~web2inbox/wp-content/plugins/formcraft/file-upload/server/content/files/16098a6a7ef30d---98555275358.pdfPDF link annotation
    • http://studiotravenzolo.it/userfiles/files/79520216225.pdfIn PDF document text
    • https://bladmedyczny24.pl/wp-content/plugins/super-forms/uploads/php/files/dffa2be3c43ada6c1552634e7ee83f6c/51406877019.pdfIn PDF document text
    • https://doellefjelde-mussemarked.dk/images/newsmail/file/kazes.pdfIn PDF document text
    • https://flvirginia.com/wp-content/plugins/super-forms/uploads/php/files/5bac031522a01a43966cc77eca589a5a/dulaza.pdfIn PDF document text
    • http://www.jhannahs.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607af92398ed0---xujipivijibos.pdfIn PDF document text
    • https://luxartparquet.com/wp-content/plugins/super-forms/uploads/php/files/e65bcdbe76cfda7d2977431e02a0d524/rogapabu.pdfIn PDF document text
    • https://burstallconrad.com/editor_files/file/45221046496.pdfIn PDF document text
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160a5a325c9149---76138496959.pdfIn PDF document text
    • https://www.frankreich-ferien.ch/wp-content/plugins/formcraft/file-upload/server/content/files/1608547f795bc6---jetowuguvaped.pdfIn PDF document text
    • http://www.christinemartin.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1609120cfd1194---mewiwimuwozemuxadib.pdfIn PDF document text
    • https://www.inter-tube.co.uk/wp-content/plugins/super-forms/uploads/php/files/c6e0640170bd01c0a140ff98b36040da/fivufagujeferumidudakeno.pdfIn PDF document text
    • https://westcoastmovers.ca/wp-content/plugins/super-forms/uploads/php/files/kj5674vgk2sr637n1pg604nde5/nutaxozinewedu.pdfIn PDF document text
    • https://cristiandellavedova.com/wp-content/plugins/super-forms/uploads/php/files/4lmmes46dcsg2f6ltaac1ckrf4/71733287275.pdfIn PDF document text
    • https://careoncall.in/userfiles/files/43284935500.pdfIn PDF document text
    • https://hosvagyok.hu/userfiles/file/85451945933.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/betokusus.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/xemuz.pdfIn PDF document text
    • https://asiaviews.org/wp-content/plugins/super-forms/uploads/php/files/5eea7ssd54vmqn5g5mmu4gput4/tixotanojatiku.pdfIn PDF document text
    • https://grandplaza.bg/uploads/assets/file/85464342783.pdfIn PDF document text
    • http://indecomavo.pl/inc/bopukoxezazafojoniget.pdfIn PDF document text
    • http://icsbc.ru/fuploader//file/91140716469.pdfIn PDF document text
    • https://imad0c0.com/js/ckfinder/userfiles/files/85145899621.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=life+with+lupusPDF 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_off0000f297.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF297 10112 bytes
SHA-256: 40f52a6c539a2f1c0affd00be9924b97d7ba60caa93f88f0de63bb1e89b1c924
font_01_sfnt_off00010959.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10959 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001216b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1216B 16868 bytes
SHA-256: bc8a1154b5492ab8179579f117c77ebdf7764517e26249621e2f985e707cc6e8

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