Malicious PDF — malware analysis report

Static analysis result for SHA-256 e816875b5bfd4513…

MALICIOUS

PDF

85.7 KB Created: 2021-09-03 03:44:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e7427710ec5d2d2bc058b8836e2a342d SHA-1: ef494232434553fd55b34aae447919d02e49e22e SHA-256: e816875b5bfd4513143c891a456ba6f3bdc13d18d4c1741a5c21b04a19c3e668
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to compromised CMS upload storage or are part of a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the structure and URL patterns suggest a phishing or SEO-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://learnazia.com/fck/imagesfile/zonudujawune.pdf In PDF document text
    • https://georgiamusicpartners.org/wp-content/plugins/super-forms/uploads/php/files/c5ae4a91ac38a1499482b4af064ea34b/putofixefidi.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/6dd096edda9f988850190599fabbb08e/tubanabodikapizupenil.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/dc4c1ad24c6c8f917cbede295f3eb5c0/26182734055.pdfIn PDF document text
    • http://thegioinoithatcamranh.com/media/ftp/file/jogeloreduzokor.pdfIn PDF document text
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c0294d26ec7---ligulitegolagedufome.pdfIn PDF document text
    • https://urbanshapes.in/userfiles/file/51057129730.pdfIn PDF document text
    • http://dmn.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608a78238d395---fotiwamujegupemado.pdfIn PDF document text
    • https://loskutova.site/wp-content/plugins/super-forms/uploads/php/files/df58cfc4b9111cea3eece6ddf345fde5/dodakizov.pdfIn PDF document text
    • http://bungefamily.com/clients/5233/File/24088145522.pdfIn PDF document text
    • http://www.linkkorea.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16090cb607a9c2---79661878936.pdfIn PDF document text
    • http://www.peritaonline.es/ckfinder/userfiles/files/33259130075.pdfIn PDF document text
    • https://www.adcgrain.com/wp-content/plugins/super-forms/uploads/php/files/5fe35285956a61c75178ad82c56cdda6/julix.pdfIn PDF document text
    • http://bloemenwinkelindex.nl/images/uploads/mozozivemizamuvagazonub.pdfIn PDF document text
    • https://alkalacarservice.com/public_html/userfiles/file/vutifilujo.pdfIn PDF document text
    • https://www.rockandroll.blog.br/wp-content/plugins/super-forms/uploads/php/files/durm2ag7phlvatg7ntlr1rsul0/29043348643.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/sii6u6lekrjo5in1ig2qp0c53q/77888808132.pdfIn PDF document text
    • https://raljob.com/userfiles/file/90788749793.pdfIn PDF document text
    • https://www.marbelitesa.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075cd100953a---rogevomunivof.pdfIn PDF document text
    • http://saydersan.com/firma/files/zivexopeb.pdfIn PDF document text
    • http://pileshoppen.dk/userfiles/file/36121882227.pdfIn PDF document text
    • http://vietthanhstone.com/images/news/file/9568264066.pdfIn PDF document text
    • https://hylyt.co/wp-content/plugins/super-forms/uploads/php/files/7bada9b105c72ab2855f0342bfd7c2bf/jikoxagamamodorubaduwozon.pdfIn PDF document text
    • http://i-daa-wl.de/userfiles/juxotezomir.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=online+convert+pdf+to+excel+free+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_off0000e99a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE99A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off000101b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101B1 10724 bytes
SHA-256: 527052ecc57848136ef82918908261606eba537f187f42b30f767fe1b86c88c8
font_02_sfnt_off00011a85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A85 17624 bytes
SHA-256: 7dee57863bb32907294a9ff8b3dfe5a2bdf03b841dbc29dad6a1725865155c72

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