Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a833a56b5333262…

MALICIOUS

PDF

93.1 KB Created: 2021-08-12 05:41:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: fe5f059db294e63348645f4ce2ec44cc SHA-1: 97d68135174f176d30fe43cff18ab7ba5a22faf9 SHA-256: 6a833a56b533326284f9297ed92a09469eaee722e0d89915e55e46012cb3812e
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as a phishing trojan and ML classifiers indicated a high probability of maliciousness. It contains numerous links, many pointing to compromised CMS upload directories or disposable hosting, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the nature of the link farm and the detection suggests an attempt to lure users to phishing or malware distribution sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9937

Heuristics 6

  • 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.
  • 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://ayurmitra.com/files/file/17549570343.pdf In PDF document text
    • http://fixafilm.se/userfiles/file/nubev.pdfIn PDF document text
    • https://isosklo.cz./uploads/13992730061.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608d2f53b044b---tubuzasij.pdfIn PDF document text
    • http://thedewakohchang.com/image/upload/File/2081519803.pdfIn PDF document text
    • http://amirafouad.com/uploaded_files/file/34225521503.pdfIn PDF document text
    • https://ventana-sur.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608ec9901812e.pdfIn PDF document text
    • https://viajespereira.com/wp-content/plugins/formcraft/file-upload/server/content/files/16096af697a544---12819985084.pdfIn PDF document text
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/0e8d3a9eb1b88482e3a3542869af6f00/46450092459.pdfIn PDF document text
    • http://math-talk.kr/wp-content/plugins/super-forms/uploads/php/files/faqqa1361fnh473smnu1oq8n9k/99843673626.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c4b9c25b284---44731075761.pdfIn PDF document text
    • https://www.caesarstravel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16113735419587---jelufisazazedemezebubamo.pdfIn PDF document text
    • http://interno-kazan.ru/upload/files/fupat.pdfIn PDF document text
    • https://condominiovillage.com/userfiles/file/segopijeba.pdfIn PDF document text
    • https://amezdigital.com/wp-content/plugins/super-forms/uploads/php/files/234720473573e533bda42c8815e611d2/19784449924.pdfIn PDF document text
    • https://abe-rdc.com/userfiles/file/daliboluvezozujime.pdfIn PDF document text
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610814b10bfc4---lomisugitarixez.pdfIn PDF document text
    • http://drstevealbrecht.com/wp-content/plugins/super-forms/uploads/php/files/715b063f5605bdeebbca98c2c370c511/wewutijuvesovipowe.pdfIn PDF document text
    • http://www.julitolaschools.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608fe9b1e4a1d---85474249517.pdfIn PDF document text
    • http://vilaportugal.com/wp-content/plugins/formcraft/file-upload/server/content/files/16110a5ddd39a5---34330276680.pdfIn PDF document text
    • http://www.thaiboat.net/image/upload/File/vamirutukatexe.pdfIn PDF document text
    • https://pointsourcegroup.com/wp-content/plugins/super-forms/uploads/php/files/5c2adbcf538c81e6b318cccfcadca91e/6389868743.pdfIn PDF document text
    • http://www.sunarpazarlama.com/wp-content/plugins/super-forms/uploads/php/files/vf9s62j6phv81qvdjt33ptah32/96273914801.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=legacy+of+discord+mod+apk+unlimited+diamond+2018PDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fbc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBC1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000113d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D3 17400 bytes
SHA-256: bec7474678edce02abc9526414b59da3035fce8b7c7cb7fa12f45da59c1b88b3
font_02_sfnt_off0001419b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419B 1824 bytes
SHA-256: df35cb05b954d2eee8b11b2756666eb15b0d4e27582203a20e31cca7290f1dd0
font_03_sfnt_off00014a2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A2C 11728 bytes
SHA-256: fbfe7452dfc94610f194fdb85f7384255e6d94da773204af3121b84bb0c328ce

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