Malicious PDF — malware analysis report

Static analysis result for SHA-256 74aa52cd816f783a…

MALICIOUS

PDF

96.3 KB Created: 2021-09-05 06:53:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 88e27a60a081f3d9771e3b1b21db03dc SHA-1: 42eebc9485782ed4a954e204c58e5dc9deaf6630 SHA-256: 74aa52cd816f783a1f4f177f733fedfd7af58bf5469fe916977b25c52f539f7f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The document contains numerous links to external websites, many of which are hosted on compromised WordPress sites, suggesting a link farm or phishing lure. The presence of embedded URLs and the nature of the heuristics indicate that the primary function is to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9929

Heuristics 6

  • 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.
  • 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://archism.ru/uplcv?utm_term=tsonga+hymn+book+download+pdf PDF link annotation
    • https://miamiuniquelimo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608f9c5b06fe2---tedewa.pdfIn PDF document text
    • https://marblobaths.com/app/webroot/img/files/ruvobexe.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.org/upload/files/55513467109.pdfIn PDF document text
    • http://uniroll.pl/user_images/file/988405324.pdfIn PDF document text
    • http://www.aportecnica.com/imagenes/editor/file/78157633044.pdfIn PDF document text
    • https://sayurhijau.com/contents//files/27641952540.pdfIn PDF document text
    • https://adikkedua.com/contents//files/jakenuripurupijumiwaril.pdfIn PDF document text
    • https://areshin.ru/wp-content/plugins/super-forms/uploads/php/files/2e6a26d59215ea340202280c0c813126/25778458710.pdfIn PDF document text
    • http://vienkiemis.lt/app/webroot/uploads/userfiles/files/16770142845.pdfIn PDF document text
    • http://cameronhaddock.com/wp-content/plugins/formcraft/file-upload/server/content/files/160841e20b6239---21475803596.pdfIn PDF document text
    • https://mimpisiluman.com/contents//files/judosetixumiw.pdfIn PDF document text
    • https://rhagro.com.mx/wp-content/plugins/super-forms/uploads/php/files/7b9db86d9c7eb5574f32021cb82c1127/fimimoli.pdfIn PDF document text
    • https://cashmeredreams.com/wp-content/plugins/super-forms/uploads/php/files/2adb2a09a7a323fec962b5f2c73dc8e8/18178518039.pdfIn PDF document text
    • https://arichaindia.com/userfiles/file/62122267093.pdfIn PDF document text
    • http://www.skup.it/wp-content/plugins/formcraft/file-upload/server/content/files/1606f41d4df9f7---tuxerugokaniran.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/vatofopiz.pdfIn PDF document text
    • http://stmrcstvm.com/userfiles/file/nenifovoxojiko.pdfIn PDF document text
    • https://penal-garazh.ru/files/xalejeni.pdfIn PDF document text
    • http://saludocupacionalpso.com/home/wp-content/plugins/formcraft/file-upload/server/content/files/1606d1eecb8027---tevifupaga.pdfIn PDF document text
    • https://propbrains.com/wp-content/plugins/super-forms/uploads/php/files/qdfednous9ebd5fkg7um9pdlq0/54814614974.pdfIn PDF document text
    • http://stringpoets.com/userfiles/file/zedudesusovumosemijo.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160da79ae2ea10---degobikolidax.pdfIn PDF document text
    • https://www.fifatravels.com/wp-content/plugins/formcraft/file-upload/server/content/files/160943632170be---ruvoponilozojodete.pdfIn PDF document text
    • http://orem.mn/uploads/files/ditobopilelaf.pdfIn PDF document text
    • http://multiseal.com.ph/wp-content/plugins/formcraft/file-upload/server/content/files/16083554dbc7a8---zorojoxubuseda.pdfIn PDF document text
    • 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_off00010fc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FC6 10920 bytes
SHA-256: fd1e493ccf1f9589bb98b4c5f1bfae007f41cf9fe10824b10df53789133efcf8
font_01_sfnt_off0001287a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1287A 19332 bytes
SHA-256: e81e518a5d681d063b9cd6bbda75d10626f32e8a50ac877158fb9070cc5d2f12
font_02_sfnt_off00015b74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15B74 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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