Malicious PDF — malware analysis report

Static analysis result for SHA-256 44da2d3e0984b51e…

MALICIOUS

PDF

80.7 KB Created: 2021-09-03 13:43:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b87ea187733f76c6f788a77e32cf3117 SHA-1: a69f6369b13cf27a57ddee386a65e87231e299db SHA-256: 44da2d3e0984b51e030bea49b9940ae548cb6a6ccbf5418d7002a6287f729596
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by multiple heuristics as a link farm, with many URLs pointing to compromised WordPress upload directories. The ML classifier and ClamAV also identified it as malicious, specifically a phishing trojan. The primary attack pattern involves tricking users into clicking links within the document, which likely leads to further malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160f759f08044b---14614604901.pdf In PDF document text
    • http://tid.vn/upload/files/nozewolefojifuwowewimifel.pdfIn PDF document text
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/tnoul87i33iv5gebe7454hv3c5/21033533923.pdfIn PDF document text
    • http://hiddenforrest.net/clients/76790/File/83465847962.pdfIn PDF document text
    • http://hnsunnyfood.com/d/files/mumexanafomatuxadol.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16105bcb80dff2---60078682125.pdfIn PDF document text
    • https://www.dekleinewerf.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16075a85bc5368---nulogikusudewekuposukexos.pdfIn PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/81b8f84b47b71519f1a8128cfdd26fe0/rabazifepuse.pdfIn PDF document text
    • http://rsst77.ru/upload/files/58259996315.pdfIn PDF document text
    • http://accurateverdicts.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c1aa56b97d---18300853038.pdfIn PDF document text
    • http://baanpowertrain.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083623c288f2---10454607203.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/160afebb81eba9---jejobawowedov.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/53457333829.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/petosup.pdfIn PDF document text
    • http://glovimex.com/uploads/ckfinder/files/jawosigexefo.pdfIn PDF document text
    • http://digitalpolicycouncil.com/imagenes/file/ragut.pdfIn PDF document text
    • https://vmkstroi.ru/wp-content/plugins/super-forms/uploads/php/files/b9e18501bbf84194b6e5540a2c400900/razep.pdfIn PDF document text
    • https://getlovebooks.com/wp-content/plugins/super-forms/uploads/php/files/29cb5c5e7a7066521cc50dd92e4cc9d2/gobajamolot.pdfIn PDF document text
    • http://verkaufs-akademie.com/userfiles/file/xojajesi.pdfIn PDF document text
    • http://cokhiminhhien.com/media/ftp/file/suzunabujunesaturiwupi.pdfIn PDF document text
    • https://korovin.org/site/img_ufiles/5390937804.pdfIn PDF document text
    • http://slsnn.ru/content/files/zeredonowazesaxilizazax.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/79913387861.pdfIn PDF document text
    • https://sasalidayanisma.org/uploads/file/60565595939.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=pradhan+mantri+awas+yojana+form+2018+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://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_off0000d31c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD31C 11420 bytes
SHA-256: 59a795c2f8239c54c7e755adf944e47fce5a68f4182a995a613e609920b56d5f
font_01_sfnt_off0000eded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDED 17804 bytes
SHA-256: b58ad0d3529cf50fc351d01d09baa228fb4d27622481665a45e5c4fbeb1809a1
font_02_sfnt_off00011cb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CB2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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