Malicious PDF — malware analysis report

Static analysis result for SHA-256 e0a80e97a4e691d2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 04:28:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f010a2d1f6564a2444e70b5073c1c914 SHA-1: ddf81fae3228d87b643d406f92932c793cf199a7 SHA-256: e0a80e97a4e691d20e57b409d114a0e1415809f7e51ebb982261aceaa105bf73
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to disposable hosting or compromised CMS uploads, indicative of a link farm used for phishing or malware distribution. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification further supports a malicious intent. While no scripts were directly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://wajl.net/img/file/2021913205624.pdf In PDF document text
    • https://quangcaowebsitecomvn.xemlaco.com/uploads/files/44627679058.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/miwoja.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/0f99dhbv458tnspinc2vrauje6/vezokunejiferarekelef.pdfIn PDF document text
    • https://marblobathware.ph/app/webroot/img/files/36423113715.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/75446957833.pdfIn PDF document text
    • http://tobn56.com/UpFiles/file/17357513828.pdfIn PDF document text
    • https://edusfera.pl/upload/file/70584512942.pdfIn PDF document text
    • http://vektor28.ru/userfiles/file/fidefimelixas.pdfIn PDF document text
    • http://erimti.com/userfiles/file/60284767782.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/pajowivejagegalagisesaxa.pdfIn PDF document text
    • http://www.atsamuihaus.com/image/upload/File/27743608512.pdfIn PDF document text
    • http://phutungquanghieu.com/app/webroot/files/ckfinder/files/65369013579.pdfIn PDF document text
    • http://style4.allwebeasy.com/userfiles/files/26994660926.pdfIn PDF document text
    • https://www.lorenzofranzone.it/wp-content/plugins/super-forms/uploads/php/files/0733f2a385e36d5bbe9c7c5ddadabd4b/11641146602.pdfIn PDF document text
    • http://pazarziraat.com/userfiles/file/resineveri.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/35a1e22e26192d8145d7dff0df636fa4/sovefivere.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/161408e5dc2198---rolaxokuvenopomedakiwiraz.pdfIn PDF document text
    • http://www.cenlaenvironmental.com/siteuploads/editorimg/file/24482540743.pdfIn PDF document text
    • http://tincorner.vn/uploads/files/rakepot.pdfIn PDF document text
    • https://gmt-tw.com/app/webroot/userfiles/files/26924545409.pdfIn PDF document text
    • https://parfumzone.ro/files/file/sefediwezimimefolo.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/96256474957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1KS0DP0cxss/uplcv?utm_term=free+minecraft+java+edition+gift+codePDF 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_off0000ddb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDB8 10776 bytes
SHA-256: b0a88b7fd0eb81f68acd18be2a7aa057188605fd272f1c6910c02cb8155215d8
font_01_sfnt_off0000f643.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF643 18124 bytes
SHA-256: 95db134b63aa2f880e473858004bc31f860d9373395b6372a1e7fa542766dbbd
font_02_sfnt_off000125c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125C4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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