Malicious PDF — malware analysis report

Static analysis result for SHA-256 1059f34f63615fe3…

MALICIOUS

PDF

92.1 KB Created: 2021-06-19 10:54:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 56532ea4a22aa1382a7903687e10b2dc SHA-1: 13832b876915ef7dce855e9bf39786538b4e082f SHA-256: 1059f34f63615fe341b9f159ecc0ce7680ae10767b5e8d4aba7d3e8de25a5e0b
136 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by an ML classifier. It uses a password-protected-archive lure. The file embeds a large number of external links characteristic of an SEO link farm, many hosted on compromised CMS upload directories. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://istanbulbalbir.com/upload/ckfinder/files/zepubotujebu.pdf In PDF document text
    • https://empylean.com/wp-content/plugins/super-forms/uploads/php/files/09ngana7kab3ueep77k96e6s1n/safojipivivosufejulewaw.pdfIn PDF document text
    • https://rmissio.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1607a80d45368e---lisij.pdfIn PDF document text
    • https://theshairpodcast.com/wp-content/plugins/super-forms/uploads/php/files/c9668a164c357e5bc8d0fbe94a362d36/wupusawemobu.pdfIn PDF document text
    • https://lemanssrl.it/file/wirek.pdfIn PDF document text
    • http://reclaimsplus.com/wp-content/plugins/super-forms/uploads/php/files/6f0e7d55e6737ed54ec9963662e4b8cd/86026481520.pdfIn PDF document text
    • http://www.victorian-manor.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160c34dcd9467c---72789685000.pdfIn PDF document text
    • http://3e-recycling.ru/app/webroot/filesfiles/zinapagefuborejinatab.pdfIn PDF document text
    • https://www.auditek.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160a69f2f2a2aa---48976897736.pdfIn PDF document text
    • https://alismobile.co.uk/wp-content/plugins/super-forms/uploads/php/files/5d52b7b93c519c38c4d8eaa774535611/zerufovixudorewojo.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1609b6143ae478---58829496593.pdfIn PDF document text
    • http://codemessaging.net/ckfinder/userfiles/files/45112406359.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606ea97394690---40124503204.pdfIn PDF document text
    • https://indacphuc.com/wp-content/plugins/super-forms/uploads/php/files/426ge720u4tj4hq0a8ink4uuvd/penazuw.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/rotozujewanad.pdfIn PDF document text
    • https://bodegoncriollo.com/userfiles/file/votepupamezixetesowesadaj.pdfIn PDF document text
    • http://smc.org.in)MeeraRegularMeera2016SMC7.0.0+20171102HussainIn PDF document text
    • http://smc.org.inhttp://smc.org.inIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/fzgW7-mxBc0/uplcv?utm_term=malayalam+kerala+padavali+class+9PDF 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
    • https://gitlab.com/smc/meera/blob/master/COPYINGIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off000103af.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x103AF 14816 bytes
SHA-256: 8fbd140ba4ca63bb30643ec6e8cb0c466414cfd627db86eb0bd1a90228b6b9d4
font_00_sfnt_off0000f25f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF25F 5096 bytes
SHA-256: 69f39d1fd04b0f5a94293af879bff47e2839e2a464b7a19eb1ea6e81ca0f58df
font_02_sfnt_off00013270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13270 9952 bytes
SHA-256: 0128cd0aa15e3d98ee76a6abb2f7efe000cf0b1c784046ac37c38f0ea57a3f2d
font_03_sfnt_off00015471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15471 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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