Malicious PDF — malware analysis report

Static analysis result for SHA-256 aba82e72a4c1d2e3…

MALICIOUS

PDF

73.5 KB Created: 2021-09-01 16:09:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 059318564012474c4970d7621c4308b5 SHA-1: f27997f1759750529ec450779477b4b9b90cc45b SHA-256: aba82e72a4c1d2e32bf0c3a9da149ede28883ce5d2ad0188a40cba4752c93e7e
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to PDF files hosted on compromised WordPress sites. This pattern is commonly used to distribute phishing content or further malware stages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://botanicgardenscafe.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1609bcaab75f86---78573472215.pdf In PDF document text
    • https://home-consult.lu/userfiles/files/36249399071.pdfIn PDF document text
    • http://m2m2design.com/userfiles/18903721055.pdfIn PDF document text
    • http://www.pirac.org/wp-content/plugins/super-forms/uploads/php/files/1fbe457ea53fe2daaf838c7680ef1cdc/53609739387.pdfIn PDF document text
    • http://www.northern-japan.com/image/upload/File/rogubenigiwunamimase.pdfIn PDF document text
    • https://erinmillssmilesdentistry.com/wp-content/plugins/super-forms/uploads/php/files/m5rnukdhh34fb5ljr7qjrgi0v4/55872670696.pdfIn PDF document text
    • http://mp-journal.com/media/file/40892975185.pdfIn PDF document text
    • http://laros.cz/UserFiles/file/63897501913.pdfIn PDF document text
    • http://aven.su/userfiles/file/xuxekeronerixabirakeji.pdfIn PDF document text
    • https://michaels-limo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c665a457312---vijarubutibixup.pdfIn PDF document text
    • https://12tiga.com/contents//files/rubupufinonerupaf.pdfIn PDF document text
    • http://arniuniversity.in/ci/userfiles/files/fafiwenelamaruvuwebu.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/zebakozebi.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/42d6239697a69644476ab558ed16bea6/84600023485.pdfIn PDF document text
    • https://hankilfood.com/upfile/files/90617635461.pdfIn PDF document text
    • http://vipforiraq.com/userfiles/files/lazigeliv.pdfIn PDF document text
    • https://alphacleanwashing.com/wp-content/plugins/super-forms/uploads/php/files/308bea510b8df9ab328f965b00ba7d76/pewalesetufajipiwa.pdfIn PDF document text
    • http://www.brennholz-heinlein.de/wp-content/plugins/formcraft/file-upload/server/content/files/1610654c66d9df---81928867394.pdfIn PDF document text
    • https://laser-arena.ch/wp-content/plugins/formcraft/file-upload/server/content/files/160984d07d75d9---54765191835.pdfIn PDF document text
    • https://martabaktelor.com/contents//files/vutugax.pdfIn PDF document text
    • http://serbanindustrialconstruct.ro/uploads/files/85077968623.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=drawing+a+car+easyPDF 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_off0000c1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1AB 10340 bytes
SHA-256: dbc29dfc9e0c92dc723b43a30009b3cc5bf0fe90f0182c4de2215c827ef076a7
font_01_sfnt_off0000d934.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD934 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f146.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF146 15436 bytes
SHA-256: bcf2e11dbafb4ac4c1264ec92ef48de5ea776bb777291e04c73f6d7b29723443

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