Malicious PDF — malware analysis report

Static analysis result for SHA-256 19f38adc93cbf87d…

MALICIOUS

PDF

87.7 KB Created: 2021-08-15 15:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 80b90aab0c63bd3a19b0dfaaf13af150 SHA-1: dcfd602ead577c3b82e35404883d250244a83158 SHA-256: 19f38adc93cbf87df1686de5df5df91db054c7a63dc05292ca0bf2c65f35e81b
172 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and a link farm pointing to compromised WordPress upload storage suggests an attempt to deliver a secondary payload or redirect users to malicious sites. The heuristic for a visual download button further supports a phishing or social engineering lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://wccia-vastu.com/wp-content/plugins/super-forms/uploads/php/files/b8d91e24df314c8ecbe99437e1da3a47/62789049445.pdf In PDF document text
    • https://socialchangefactory.org/wp-content/plugins/super-forms/uploads/php/files/a089dcfce10b165098d4362cf76d6e66/zaxepinazagobujanalawuk.pdfIn PDF document text
    • http://franzoesischebulldoggen.eu/userfiles/file/25957482890.pdfIn PDF document text
    • https://artofsurfing.com/preview/ckfinder/userfiles/files/lejoxufoxunulix.pdfIn PDF document text
    • http://brenno-tojestto.pl/userfiles/file/wufevefapivuxalugakikin.pdfIn PDF document text
    • http://www.neslihanonur.com/wp-content/plugins/super-forms/uploads/php/files/6ac8150d7f4277ad31a9857144afd1e2/17013883862.pdfIn PDF document text
    • https://vinamex.info/uploads/news_file/volinejatok.pdfIn PDF document text
    • http://autosvanbeek.nl/mindcms/js/ckf/userfiles/files/tanotoforuzurifutixiba.pdfIn PDF document text
    • http://szamosiszerviz.hu/feltoltott/files/29361947355.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/o8646ve02f6ollaocr4ptcrctk/25963903212.pdfIn PDF document text
    • https://evrenmentese.com/upload/ckfinder/files/xomunuzi.pdfIn PDF document text
    • http://hgbs.de/userfiles/file/voriduj.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/160c9e000e88bc---ritososubuvigaraja.pdfIn PDF document text
    • https://charterfori.ir/basefile/charterforiir/files/63765178779.pdfIn PDF document text
    • http://compie.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1607f8db709e56---famelekejeter.pdfIn PDF document text
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c91b76a8a4---26613602300.pdfIn PDF document text
    • https://teamcode.net/upload/files/37258089554.pdfIn PDF document text
    • http://capital96.com/userfiles/file/fifemomu.pdfIn PDF document text
    • http://pi-consulting.ch/download/toxevuje.pdfIn PDF document text
    • https://relaxationplusmn.com/wp-content/plugins/super-forms/uploads/php/files/7372c40c8d9d42264427dd8ceaf178f2/kubinezidalodikuriza.pdfIn PDF document text
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ce8a971e2a---renixizilokukijurujokifav.pdfIn PDF document text
    • http://ristoranteibucanieri.it/userfiles/files/fuvadekijupiwis.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=character+certificate+format+by+village+sarpanch+pdf+downloadPDF 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_off0000ef94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF94 17484 bytes
SHA-256: dbb9a68fc008a83d8efcda9b2ef7d8a020116cc760da0033faa4d3dab7cdc7e6
font_01_sfnt_off00011d20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D20 11504 bytes
SHA-256: 53d7a5d6e09261f0f0659ea7d75b55ff52a241386556317daa541d81c128ab28
font_02_sfnt_off000137dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137DD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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