Malicious PDF — malware analysis report

Static analysis result for SHA-256 808b8de91e7f0a88…

MALICIOUS

PDF

88.4 KB Created: 2021-06-24 07:46:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 71b9f2392ecf742d711ed8801a46c6aa SHA-1: 44b833b9e3c15227f518050e7e18e7b575ddd866 SHA-256: 808b8de91e7f0a88c723e25710acd7f1602b48360bffcb8aebf5e4b9900d3ed7
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a link farm pointing to compromised WordPress upload storage, suggesting it is used to distribute malicious content or redirect users to phishing sites. The presence of numerous unknown URLs further supports its role as a distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160aa73d7e33d6---mibefigi.pdf In PDF document text
    • https://pensiunea-escape.ro/ckfinder/userfiles/files/makaposip.pdfIn PDF document text
    • http://dbcasagayathottam.org/assets/uploads/cms_images/files/jaxafarasiritesel.pdfIn PDF document text
    • http://www.tif.cn/wp-content/plugins/super-forms/uploads/php/files/31c170cqvph5q3jv80tqkd920l/vojus.pdfIn PDF document text
    • http://acecaalcoy.com/userfiles/file/14802270744.pdfIn PDF document text
    • https://www.prowallpanama.com/wp-content/plugins/super-forms/uploads/php/files/e88a59e2df5d23c3148203c8c34711ce/jirisewuvefakukisobejonu.pdfIn PDF document text
    • http://www.ferm-matic.fr/upload/file/354877962.pdfIn PDF document text
    • https://growlocals.com/wp-content/plugins/super-forms/uploads/php/files/62e48abc41342b01c19a41b4e4d34c07/32975194313.pdfIn PDF document text
    • https://mosconi.net/userfiles/file/dokadubukoromati.pdfIn PDF document text
    • https://castilloexterior.es/ckfinder/userfiles/files/92236073069.pdfIn PDF document text
    • http://www.whirlpool-beachcomber.at/wp-content/plugins/formcraft/file-upload/server/content/files/160ac4bd091aa8---rajuwadufedini.pdfIn PDF document text
    • https://youstore21.com/wp-content/plugins/super-forms/uploads/php/files/8400ed47fa5a95e6614d96bbaa8395f0/sizawufuxinosimo.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/83036594010.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/21195622261.pdfIn PDF document text
    • https://spherule.org/wp-content/plugins/super-forms/uploads/php/files/0b8717db02a3d49d807972cab8eefd89/13206552016.pdfIn PDF document text
    • https://amesmedicalservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608786b110a78---23880044165.pdfIn PDF document text
    • http://analogsys.com/uploaded/file/1519808794608b5d132e651.pdfIn PDF document text
    • https://fourseasons.events/wp-content/plugins/super-forms/uploads/php/files/7fa68ff1052b852113bfb09f0532e3fb/52404730169.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=foxpro+commands+list+pdfPDF 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://scripts.sil.org/OFLIn 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_off00010417.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10417 5324 bytes
SHA-256: 83ea5c4cbf7a302530dd1706e790d3dda857be88d8faeec71776b01a2bcee594
font_01_sfnt_off00011626.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11626 11760 bytes
SHA-256: 753ff3f93c19961ab42566be03f12a985cbfca274965e3148857a309a95bf2c1
font_02_sfnt_off00013e36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E36 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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