Malicious PDF — malware analysis report

Static analysis result for SHA-256 6e0d0414ba0005f1…

MALICIOUS

PDF

87.7 KB Created: 2021-09-16 08:21:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: efef4f61182bafa61182a8d441d4b328 SHA-1: 280b0775481435f002884920a2e2e84d8ae4a804 SHA-256: 6e0d0414ba0005f1b9841c12ad8152d38f51e8c75be4e4cac4d49e8b820562fb
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript and a large number of external URIs, many of which point to compromised CMS upload directories. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on disposable hosting and compromised WordPress sites suggests a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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://almentispharma.com/ckfinder/userfiles/files/jabipin.pdf In PDF document text
    • https://bistakalikotenetwork.com/userfiles/file/79535822498.pdfIn PDF document text
    • http://bienbao.net/uploads/files/38646041668.pdfIn PDF document text
    • http://showplus.ae/userfiles/files/fezevowilixuvekexizone.pdfIn PDF document text
    • https://brylka-kfz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb8dacbc77---99149360654.pdfIn PDF document text
    • http://seidels-mineralienwelt.de/images/uploaded/file/77125274553.pdfIn PDF document text
    • http://thegioimercedes.com/upload/files/siviwavogejolunive.pdfIn PDF document text
    • http://www.petersonassoc.com/emailimages/file/68315214862.pdfIn PDF document text
    • https://holycrosshealthcare.com/userfiles/files/ziwotapazonudefipurozaj.pdfIn PDF document text
    • http://thy-environment.com/userfiles/files/muvagigogekumesogu.pdfIn PDF document text
    • https://intekcanada.com/ckfinder/userfiles/files/53142858885.pdfIn PDF document text
    • http://nail-free.com/ckfinder/userfiles/files/24952597723.pdfIn PDF document text
    • http://hotelclinton.it/userfiles/files/bixisozisorazugilura.pdfIn PDF document text
    • http://karate-talence.com/newsite/userfiles/files/41160977744.pdfIn PDF document text
    • https://fortlauderdale-carservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139fb63ab218---lebal.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/26802283486.pdfIn PDF document text
    • http://pallenberg-busreisen.de/uploads/files/tefisag.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/9170022303398dae0fcc0ac1685b6980/fuzad.pdfIn PDF document text
    • http://china-baby-clothes.com/d/files/wigovasubojonemagigukul.pdfIn PDF document text
    • http://serextion2006.com/js/upload/files/xikupameji.pdfIn PDF document text
    • https://network-italia.com/file/63117616051.pdfIn PDF document text
    • http://at2apigroup3.com/contents/files/1092132655.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/DOqCt-cVA4I/uplcv?utm_term=fight+club+putlockerPDF 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_off0000ee07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE07 10528 bytes
SHA-256: 7aebc16f6593c01ca96968b4e2822fd146c3cb9226bf0ac9101627cc435d5b6f
font_01_sfnt_off000105e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105E1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011df3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DF3 19908 bytes
SHA-256: aa766e213ba819647236c13cc0f6d1952658a21c7ee8845416b834fdcb5d9dee

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