Malicious PDF — malware analysis report

Static analysis result for SHA-256 c99c7d3316e65ddf…

MALICIOUS

PDF

70.1 KB Created: 2021-09-10 04:19:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 401ed6fadc655a67b6ab43af1bc5e0b5 SHA-1: 095efdbec7c28b8700bbcdac6616962dcb812732 SHA-256: c99c7d3316e65ddf3ee13835fbe58339c4d2c5e851cf171551b354f92ca25bc8
204 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1105 Ingress Tool Transfer

This PDF contains embedded JavaScript and numerous links, many pointing to compromised WordPress sites and disposable hosting, suggesting an attempt to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to download a second-stage payload. The primary attack pattern involves a link farm designed to trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • 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.
  • 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://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/16133470f4d6b6---85053394002.pdf In PDF document text
    • http://bangiyaparishadtoronto.ca/bpt/editor/uploadfiles/6808966838.pdfIn PDF document text
    • http://www.farmaciabergua.com/userfiles/files/20901429078.pdfIn PDF document text
    • http://erfolgsapp.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613567891d306---fozupowujumasuvawijekoj.pdfIn PDF document text
    • https://radiosmile.hu/upload/file/11033241457.pdfIn PDF document text
    • https://liantoong.com/archive/upload/files/zobodanuzoj.pdfIn PDF document text
    • http://vesimport.ru/userfiles/file/wijefibup.pdfIn PDF document text
    • https://sanaspinler.com/calisma2/files/uploads/87550911947.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210901083537.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/af8c107b8c24b19900821d76d60ae028/39219495558.pdfIn PDF document text
    • http://www.39koratmachinery.com/file_upload/files/xazazivaf.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/lezunelaxajum.pdfIn PDF document text
    • http://www.sbawerribee.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16134925e0a69f---13844033702.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/97298144338.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/161307741a5c2b---24762486279.pdfIn PDF document text
    • http://www.zav-mito.si/wp-content/plugins/formcraft/file-upload/server/content/files/16130e73d0c1f7---bazitekizolalose.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/9212896704.pdfIn PDF document text
    • http://bfr-bialapodlaska.pl/userfiles/file/migusegokejuj.pdfIn PDF document text
    • http://www.fuchingrading.com/upload/file/25636442155.pdfIn PDF document text
    • https://pmcp-avac.com/files/upload-ckfinder/files/16932181607.pdfIn PDF document text
    • https://wyslijpaczki.pl/app/webroot/files/userfiles/file/zasikir.pdfIn PDF document text
    • http://ambulatorioveterinariosantanna.eu/userfiles/files/beguxowotigovafopekanojox.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/63266002123.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/zMnd8XtcwSM/uplcv?utm_term=videoder+pro+apk+download+2020PDF 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_off0000b59d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB59D 15028 bytes
SHA-256: 5807f00ad2d272a3ff5798b9a287f9f79447c76a11e0b81352f8a515109ec36a
font_01_sfnt_off0000dadb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2F2 10508 bytes
SHA-256: d8a77ae2dea61fe69d1bba2183db4b8aa0e1a887d3c28a3fdac18484005aef8e

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