Malicious PDF — malware analysis report

Static analysis result for SHA-256 166323f68a068763…

MALICIOUS

PDF

88.7 KB Created: 2021-06-30 09:51:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0bb2f7ab38304cb78518905168c33208 SHA-1: 99c3e1e5e8318c85276f97861ab5659f68c8e758 SHA-256: 166323f68a06876356dbc933acc752527b0a35c8231d8cbe4986770481d2b7ed
156 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to compromised CMS upload storage or disposable hosting, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution through these links. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9946

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cameralehiep.com/hinhanh_fckeditor/file/25801969497.pdf
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b877df77cc6---7565327564.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/pisupedupefazejemepimo.pdf
    • https://kakvkusno26.ru/wp-content/plugins/super-forms/uploads/php/files/fc9fa093c22370ff97a185c637c0c9c6/48172560257.pdf
    • https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/0lh4ga6f1gdmevv873tr7dqbc5/73587068936.pdf
    • https://lightsourceindiana.com/wp-content/plugins/super-forms/uploads/php/files/471af3f7823dd9fb255a387e68e39d60/6798994997.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/rh3csnsgnq1f8nbufpa1137mar/55446935861.pdf
    • https://soalmatematik.com/userfiles/file/gomonelazivafovudegutive.pdf
    • http://zjqzzx.com/uploadfile/file/2021062104281873499.pdf
    • https://profbuhotchet.ru/wp-content/plugins/super-forms/uploads/php/files/1bfa73d57ac5a73d5a13a742a9fc0342/papokadapikozurop.pdf
    • http://camonetinternational.com/files/file/83135679703.pdf
    • http://ophirtonhotel.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/16075bea75f82d---52640841367.pdf
    • https://angkagenap.com/contents//files/feguroxekaxudizosokes.pdf
    • https://funkydrop.shop/wp-content/plugins/super-forms/uploads/php/files/81feaea1d278487454c48b9e83b91671/77047280716.pdf
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/257b9388226c4a550a415bb4162ca4df/75823920331.pdf
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b18ea21b6d0---40364763700.pdf
    • http://www.auditsi.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607b6e536c965---mejalolepunituvisex.pdf
    • http://pmdrecycling.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c532be1b30e---foxugosateletos.pdf
    • https://jiptv.nl/wp-content/plugins/super-forms/uploads/php/files/g135jpmkpbiupodl576m5o9kdt/xolixasabu.pdf
    • https://www.taxikladis.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160d380753dd24---38849023662.pdf
    • http://marthomaiticherukole.com/userfiles/file/jitegit.pdf
    • http://mikomisushiwc.com/uploads/files/82789837579.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/zMnd8XtcwSM/uplcv?utm_term=inp+to+pdf+online+converter
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E7 16792 bytes
font_01_sfnt_off0000fbfe.bin
2923fb7093d6641c5af177284e05e9199f268d70ee6ddb98104e741cf73d808c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFBFE 10300 bytes
font_02_sfnt_off0001133e.bin
bf3ac2bbc5511ca59b022801f68684aa2b8ae7661b1a55c6866fed5ae8d27d0d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1133E 16232 bytes
font_03_sfnt_off0001291c.bin
0e66a72fb762508e530bbf38a0d8f232c2f372c1922a29f088b2cf1c9d2f276d
pdf-font-stream PDF embedded font (sfnt) at offset 0x1291C 17016 bytes