Malicious PDF — malware analysis report

Static analysis result for SHA-256 8af6c1a5dba53f0e…

MALICIOUS

PDF

96.9 KB Created: 2021-08-13 10:53:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: f98d387627d2ac578a95729cd5850b38 SHA-1: ceb34cfebf68dc5bb3cc5d98badcd8b106379009 SHA-256: 8af6c1a5dba53f0e602b83e17217ea69b1b13b7980fa451b2fd206ae1c8e1d5a
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. The PDF also functions as a link farm, with numerous URLs pointing to external resources, many of which are hosted on compromised WordPress sites or disposable domains. This suggests an attempt to redirect users to malicious sites for phishing or to download further malware. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

Heuristics 7

  • 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 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://pellevah.com/upload/files/49455777105.pdf In PDF document text
    • https://infiniteprospects.com/FCKeditor/file/94105723988.pdfIn PDF document text
    • http://emeraldcovepartners.com/_data/images/file/59291081141.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/160afd62751d8f---96173683999.pdfIn PDF document text
    • http://rufullthrottle.com/wp-content/plugins/formcraft/file-upload/server/content/files/160876cfb860bf---kutetupuregelikawuwo.pdfIn PDF document text
    • http://bloomx.com/sites/all/sites/bloomx.com/files/datagofa.pdfIn PDF document text
    • https://www.tonygssoulfood.com/wp-content/plugins/super-forms/uploads/php/files/9455ba90ef89cae70615875362bfcdc4/pulusuxojot.pdfIn PDF document text
    • http://bkmarine.net/ckfinder/userfiles/files/1627638722.pdfIn PDF document text
    • https://almuhja.com/ckfinder/userfiles/files/21562745098.pdfIn PDF document text
    • https://www.peeryhotel.com/wp-content/plugins/super-forms/uploads/php/files/3f5b4d4a41d2638762d762f8643242c2/jenefoxasataxigulajobu.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b969d3a5b3f---polupabemagiwanif.pdfIn PDF document text
    • https://www.capitalroofingct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ab0f7e5be9---puzuduzimofedogalupiwu.pdfIn PDF document text
    • http://www.191seo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160ad83c83804d---2700422442.pdfIn PDF document text
    • https://toppelletmachine.com/d/files/40167470923.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-7-14/20210714123536943686.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/16090c84c6ab6a---rigipux.pdfIn PDF document text
    • http://tomei4x4.jp/js/upload/files/37343516479.pdfIn PDF document text
    • http://obchodsezlatem.cz/upload/files/1974460853.pdfIn PDF document text
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609d37c644565---defoxizilob.pdfIn PDF document text
    • http://trimblehighalumni.com/clients/84492/File/fejipivonutanavi.pdfIn PDF document text
    • http://netpost.vn/upload/userfiles/files/75755923686.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=bible+quiz+questions+and+answers+from+luke+pdf+in+teluguPDF 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_off000116c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00012ed4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED4 16892 bytes
SHA-256: 8aea07b554c5c00cc200c66d21e91d6e914864484d5e67e67852ff67daea1c13
font_02_sfnt_off00015a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A80 11516 bytes
SHA-256: 281cc752bb106f45961afcbe04006886aad7a934afffe70fe90300cf27f89515

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