Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbaa4b2380a06b70…

MALICIOUS

PDF

76.4 KB Created: 2021-09-16 10:53:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 979b8c0378c93d594fba2096e8986b6f SHA-1: 3a33695169131abdd7108842e8e81ea089238206 SHA-256: dbaa4b2380a06b70fa3a634e778829747aaf56c3131d0c664d6e2bab1e984bbe
212 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and multiple links to external resources. The heuristics indicate that the PDF is designed to appear as a download lure, with links pointing to compromised WordPress sites and disposable hosting domains, suggesting an attempt to deliver a secondary payload. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 9

  • 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 to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://smidgel.ru/uplcv?utm_term=top+offline+rpg+games PDF link annotation
    • https://lescourailleurs.com/upload/editor/file/63135787434.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/vaperutegavit.pdfIn PDF document text
    • http://ageddfjtj.pretty-match.com/upload/files/31895869988.pdfIn PDF document text
    • http://hvpeds.com/upload/contents/file/kapamiguvajadar.pdfIn PDF document text
    • http://tasarimak.com/ckfinder/userfiles/files/lovenixixojinoserakutabi.pdfIn PDF document text
    • https://buyafranchise.org/files/files/53614268370.pdfIn PDF document text
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138c11e4e699---38186756425.pdfIn PDF document text
    • https://elitestrategyglobal.com/wp-content/plugins/super-forms/uploads/php/files/4ac720db8d3f01b8d064de180cbc0611/10321120550.pdfIn PDF document text
    • https://hanedantoptan.com/upload/files/75674748039.pdfIn PDF document text
    • http://minhtoangalaxyhotel.vn/app/webroot/files/ckfinder/files/sobumilelafosol.pdfIn PDF document text
    • https://afgventuregroup.com/cfiles/file/jegadixavekaxazepomivo.pdfIn PDF document text
    • http://sun-green.nl/ckfinder/userfiles/files/naxivogevokusewijati.pdfIn PDF document text
    • https://ceccardolj.ro/userfiles/file/pavavowivomodidisekato.pdfIn PDF document text
    • http://apothepharma.com/upload/files/gebimutavatogopazozile.pdfIn PDF document text
    • https://cheeselicious.net/UserFiles/file/46181446461.pdfIn PDF document text
    • https://kitapkapla.com/upload/ckfinder/files/balijetulupomoboj.pdfIn PDF document text
    • http://cathyourhair.nl/js/ckfinder/userfiles/files/jipedagawupugano.pdfIn PDF document text
    • http://cke.hk/userfiles/95869937653.pdfIn PDF document text
    • http://sedaciesupravy.sk/media/file/36179026162.pdfIn PDF document text
    • http://www.sunarnuricomuisvealisverismerkezi.com/wp-content/plugins/super-forms/uploads/php/files/u4cgmoi6ofvekj3m4ko6vm1fq0/wixokenupumewimiwim.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/49861751628.pdfIn PDF document text
    • https://slotpt2.com/contents/files/tabelavagamapirezebisuf.pdfIn PDF document text
    • 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_off0000c7d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D0 17120 bytes
SHA-256: cdfe101546a13cc4b29289d037d30a0698037ecadaad9153ebbd9c270042c69e
font_01_sfnt_off0000f3e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010bf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BF9 10564 bytes
SHA-256: 25becd8738dd72804cfc25d0427ae5b90061c7f9b400251433f42e65f5d4b0ba

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