Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7fd1d18f72ffaa8…

MALICIOUS

PDF

78.0 KB Created: 2021-09-07 20:03:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 1158a522b264ffa7227c396f3316380b SHA-1: dd1818523de12121785e283c7998a442d9ca1d07 SHA-256: a7fd1d18f72ffaa861e96a440aeff8bdeb33711ae10ae1472bf180e4c690a37d
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF document identified as malicious by ML classifiers and ClamAV. It contains embedded JavaScript and a significant number of external URIs, many of which point to compromised WordPress sites acting as a link farm. This suggests the document is designed to lure users to potentially malicious or phishing content through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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.
  • 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.danvillern.com/wp-content/plugins/super-forms/uploads/php/files/7c003d4bd31dfb98756237bf8f6f1c56/vazorixixudoj.pdf In PDF document text
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/160860d966a9e6---88213711027.pdfIn PDF document text
    • https://o-dance.com/upload/files/31103178361.pdfIn PDF document text
    • http://impex-italia.it/userfiles/files/3429842916.pdfIn PDF document text
    • https://beautydent.hu/editor_up/22918235155.pdfIn PDF document text
    • http://myjobcareer.net/userfiles/file/2021070802583373499.pdfIn PDF document text
    • http://anhuicrew.com/upload_fck/file/2021-5-13/20210513112153678553.pdfIn PDF document text
    • https://californiaoptionsrealestate.com/wp-content/plugins/super-forms/uploads/php/files/6213c2cd8244b67369ad7d4a7cf59e5b/fabilixuxelemafujud.pdfIn PDF document text
    • https://n-v-v.dk/userfiles/file/depugokuliwalo.pdfIn PDF document text
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c42e44788b6---gotidofeku.pdfIn PDF document text
    • https://evenimentecastel.ro/wp-content/plugins/super-forms/uploads/php/files/1358qbj7m0g6mes18acqc1r4om/vajamevexowujunufigibak.pdfIn PDF document text
    • http://beergolfers.com/blog/images/file/welasusagijopazawokezejab.pdfIn PDF document text
    • http://chnli.tw/CKEdit/upload/files/65471542792.pdfIn PDF document text
    • http://c2r-auto.com/uploadfiles/file/2021062412371273499.pdfIn PDF document text
    • https://newat.ru/wp-content/plugins/super-forms/uploads/php/files/457f521cc2a91638208d41ffc4ce6847/bawarebaxebed.pdfIn PDF document text
    • https://jagamimpi.com/contents/files/82702952581.pdfIn PDF document text
    • https://bellevuecommunityfoodbank.org/wp-content/plugins/super-forms/uploads/php/files/92eb6b0c85c7e131e35ebf6f8e5661fd/gapezulodupaliso.pdfIn PDF document text
    • https://camelcarpet.org/d/files/35791945642.pdfIn PDF document text
    • http://daieimotors.com/js/upload/files/35201179031.pdfIn PDF document text
    • https://xn--80adj7cxa.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/07266631b7722a270686c146d2c8243a/tunurunimatido.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=website+opslaan+als+pdf+macPDF 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_off0000ccd9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCD9 17324 bytes
SHA-256: 8df8aed2766a035c2f2f8e4e1afbf5e17400249614c2605f0c6d5fe2a724ecf6
font_01_sfnt_off0000fa48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA48 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001125f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1125F 10812 bytes
SHA-256: 15f134aa0f68f1a9c2cac157b9970192ad6501f62d14922bd113df4cacbeee53

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