Malicious PDF — malware analysis report

Static analysis result for SHA-256 3df9cb5a3f678bf6…

MALICIOUS

PDF

82.0 KB Created: 2021-09-02 00:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a5ba934b77d6cd88549b0ee268660eab SHA-1: 9ef465d56b18e5799753ea474fa7d10250262da9 SHA-256: 3df9cb5a3f678bf67b1570f390b5a1b7a20a0656f1765561f4896b19cccde209
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was identified as malicious by a machine learning classifier and ClamAV, indicating a phishing or trojan threat. It functions as a link farm, with numerous embedded URLs pointing to external sites, some of which are hosted on compromised WordPress installations. The primary purpose appears to be directing users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://contabil-fiscal.ro/mm/file/1734352649.pdf In PDF document text
    • http://annandale1963.com/clients/69704/File/53337427179.pdfIn PDF document text
    • http://controldellaves.com/app/webroot/arxius/file/wofuwa.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/29591042170.pdfIn PDF document text
    • http://importfoodfair.com/userfiles/image/2021/08/file/ganawilugijuxujarobegexex.pdfIn PDF document text
    • https://giriconsultancy.com/content_files/files/43905940284.pdfIn PDF document text
    • http://travelport.pl/userfiles//file/32650892238.pdfIn PDF document text
    • https://christembassybarking.org/wp-content/plugins/super-forms/uploads/php/files/1597c4a218a5c72886f921ab22af053d/80388987736.pdfIn PDF document text
    • https://dfa-finanz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1606d3e8a011ba---96226753454.pdfIn PDF document text
    • http://abnicum.com/files/file/fadixuvix.pdfIn PDF document text
    • https://balustrady-metalik.pl/files/zebuxakananuzukevaxamap.pdfIn PDF document text
    • http://victorylimo1.com/wp-content/plugins/formcraft/file-upload/server/content/files/160bcddea08919---kubosixo.pdfIn PDF document text
    • https://chrmglobal.com/userfiles/file/16781996445.pdfIn PDF document text
    • http://www.socalgreatwhite.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ee604226cf---5165720852.pdfIn PDF document text
    • http://ipceurope.com/assets/file/wanewat.pdfIn PDF document text
    • http://caacoding.net/wp-content/plugins/formcraft/file-upload/server/content/files/160edb15ba5bd9---jopenobaz.pdfIn PDF document text
    • https://appfacile.it/file/tojosevonaf.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/58909038556.pdfIn PDF document text
    • https://viessmannboilers.ca/fck_upload/file/14778716239.pdfIn PDF document text
    • http://teaandtiara.ca/clients/c/cf/cffd5a667a547ddf6f7ed7e454f715b7/File/89543512718.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/1611d733a5f8ee---vominip.pdfIn PDF document text
    • https://www.swx.global/wp-content/plugins/super-forms/uploads/php/files/33096e143fe555564f46fee71bc51fde/2408045682.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/2767ed005ade5ace75e18ac708c86a67/73878621565.pdfIn PDF document text
    • https://tidaksusah.com/contents/files/xaruvalurefalumotukor.pdfIn PDF document text
    • https://3dreamvr.com/wp-content/plugins/super-forms/uploads/php/files/8b2fb9aa3a7cd982c3fa4383b1685cc8/zafaxuxawexo.pdfIn PDF document text
    • https://inchirierielicopter.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16082b3f5b0bcf---65229829586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1xuhb7AK25c/uplcv?utm_term=tipster+predictions+todayPDF 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_off0000dbc2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC2 17496 bytes
SHA-256: c29c26b710bd5b9cbe683d4f8a3d4d69234f4e407492560e631ed27696670e3a
font_01_sfnt_off000109c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000121df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x121DF 10536 bytes
SHA-256: d6274a48a91c4b5744ba3a2468ca3e7b002e03926877c94d2e17750c9fdf6114