Malicious PDF — malware analysis report

Static analysis result for SHA-256 101f212141651108…

MALICIOUS

PDF

91.0 KB Created: 2021-06-27 15:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: af8d84db95e191236a955d041e12bd87 SHA-1: 4daa81655495fe13cdaad7c0b44e85323fcfccea SHA-256: 101f2121416511089201f929e0a2917e0032a230d6cbf891f9851241d4a77ba7
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristic analysis revealed that the PDF acts as a link farm, with numerous URLs pointing to compromised WordPress sites. These links likely serve as a lure for phishing attacks or to distribute further malware. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://apexforestservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608bda61683b1---62080729699.pdf
    • https://www.helpforbusymums.com/wp-content/plugins/super-forms/uploads/php/files/1433cffa50b3b202c27524042ca2e46c/89088903202.pdf
    • http://xn--80aadq3ae7aa5k.xn--p1ai/upload/file/40238748525.pdf
    • https://www.qlsny.com/wp-content/plugins/super-forms/uploads/php/files/5e557cc8accf5b43693c8ecd81a22924/bimogetozejunumuxulojaxer.pdf
    • http://npas.ru/pic/file/vukinafatewulujomimoj.pdf
    • http://3duct.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607154732b251---liwepuvurevoki.pdf
    • http://averon.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160b30d5a90d88---logalejipagezojam.pdf
    • http://www.optionassurance.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1609b9bd2cc31a---28172493651.pdf
    • https://fieldofgreen.com/wp-content/plugins/super-forms/uploads/php/files/598cee6e51fa884b0d92d8a42a49ccac/betumutinemopon.pdf
    • http://kythuatviet.vn/uploads/userfiles/file/buvudawidomawopomixubodo.pdf
    • https://beachesbrewing.com/wp-content/plugins/super-forms/uploads/php/files/919e4fbdb8a7718b46dfa512dd997bdb/3406474112.pdf
    • http://ajtoablakcentrum.com/_user/file/91207002690.pdf
    • https://aliencosmicexpo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b73838bd82c---jikapi.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/16075f118c4933---lobatutumevorubur.pdf
    • https://414movement.com/wp-content/plugins/super-forms/uploads/php/files/d0a344ccb8029e162c08506d69aca630/milekebejinunudaribawaj.pdf
    • https://nnkcreations.com/userfiles/file/18126051455.pdf
    • http://admio.ru/wp-content/plugins/formcraft/file-upload/server/content/files/160cbaf1364841---banataxalukopixaf.pdf
    • https://rittenhousesmiles.com/wp-content/plugins/super-forms/uploads/php/files/fb769b262fc63f4313edcc4196875a16/mukegotef.pdf
    • https://christianboudreau.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afbc33bf243---lasurusu.pdf
    • http://visualpaint.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607685594d63d---zinesuneku.pdf
    • http://stlnsk.ru/uploads/file/gugasokik.pdf
    • https://www.cfo-search.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c8ae7e56261---68795344271.pdf
    • https://macleanpinesdrivingschool.com.au/wp-content/plugins/super-forms/uploads/php/files/1b716a7d3f89fdbaaf7cdd2d683112aa/tisugena.pdf
    • https://mmszke.hu/files/file/55220325149.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=what+can+you+use+instead+of+taco+seasoning
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010126.bin
0c13b25be56e67f681b00ab63dd77302c65a03b5d0f8329a8b9d91e441f6abf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10126 10816 bytes
font_01_sfnt_off000119ef.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x119EF 16792 bytes
font_02_sfnt_off00013201.bin
122d9f280b10c721847205da6f10ae12c1ff744960f1c0bf1a4b8c3749606b05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13201 16940 bytes

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