Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf5750181a72750…

MALICIOUS

PDF

89.7 KB Created: 2021-07-02 19:32:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dfa7728bf7579c8800d2e82e130802f2 SHA-1: 109d02aad54cf0f39e3af5c9a850ac7aeb949c51 SHA-256: bdf5750181a7275041442516a14f82f2e52fc1eabf2332ae51ef18298c55b2ac
156 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a link farm pointing to compromised WordPress upload directories and other disposable hosting. While no scripts were extracted, the PDF structure and numerous external links suggest it is designed to redirect users to potentially malicious sites, possibly for phishing or SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b132b01bff1---85669123510.pdf
    • http://www.miamiairportlimo.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a9492bac527---30913386546.pdf
    • http://yuhongzg.com/d/files/wedusisoduwukisujije.pdf
    • http://discoveryenglish.org/wp-content/plugins/formcraft/file-upload/server/content/files/160d90f5977e01---98872309178.pdf
    • http://ore-processing.ru/d/files/zafebanolibeza.pdf
    • http://makaeximworld.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b55c56f2aa5---2327411018.pdf
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/v5s9jl4k75ul85pvo54o59fog3/4054508180.pdf
    • https://afanasyev-design.ru/wp-content/plugins/super-forms/uploads/php/files/99948a87cb9954389f8449033774c092/kexozuxatuziloxeseleji.pdf
    • http://quickfix-poland.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4299678caa---92618021307.pdf
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/160bc72de35bc3---13494342889.pdf
    • https://drmarlenebothma.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160a3f96c4e659---gapepigugigimutiju.pdf
    • https://festival-bg.com/media/ckuploads/files/taxivukewixebijesoberoso.pdf
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/5a3ebdd7428c87d56f2476eeec0b0c42/tudovufomalotidapovepek.pdf
    • https://salubrismd.com/wp-content/plugins/super-forms/uploads/php/files/d732be8438f3ae7b1e4ed8d9ae76d195/93270105242.pdf
    • https://xn----8sbaavnccwq4am.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/41c62cd0d16e03958eb95e9112a582ed/widevabekuzipadonofonowus.pdf
    • http://gomientrung.vn/uploads/image/files/12347615172.pdf
    • http://metafelix.it/userfiles/files/fagitavapowemikubilerobax.pdf
    • http://pphu-joanna.pl/fckpliki/file/wavonipenezudimugogas.pdf
    • http://kirilmazbardak.com/userfiles/file/8685726947.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16083d6ff624bd---89815134687.pdf
    • https://expeditions-travel.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080fb2f9c0c2---niniko.pdf
    • https://www.truesdalepainting.com/wp-content/plugins/formcraft/file-upload/server/content/files/16073bf2fd5585---21778931498.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=shipping+and+receiving+job+interview+questions+and+answers
    • 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_off0000fbe6.bin
531a94fb3f02cfe02803fb53622dceb9a00340e579999df5cb15b6fe35783d6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 16568 bytes
font_01_sfnt_off000126a2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x126A2 16792 bytes
font_02_sfnt_off00013eb9.bin
4d79d53b1680bf55a6c74ab4d85459d69df6ca9d65896aa662d678101f46efb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13EB9 11492 bytes

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