Malicious PDF — malware analysis report

Static analysis result for SHA-256 1e909a160e71c757…

MALICIOUS

PDF

92.5 KB Created: 2021-06-20 22:13:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0051c62596a794185815b6d178e52f65 SHA-1: f0b8f00ef9adf52c7da04b3627e4ff117ef36774 SHA-256: 1e909a160e71c75715cc4826cbca278dbe2f1deffd08d43bec87ea8febd951b7
156 Risk Score

Malware Insights

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

The PDF contains numerous links, many pointing to compromised WordPress sites, suggesting a phishing or malicious redirection scheme. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or downloads. The presence of multiple external URIs and link farms points towards an attempt to distribute malware or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 https://ltgtrends.com/wp-content/plugins/super-forms/uploads/php/files/080992848321cfa986d86f4f6b6b8464/bisegolewet.pdf
    • https://aquariumfargo.com/wp-content/plugins/super-forms/uploads/php/files/91315ff194f6ee684c6e596bb3ec4f9e/vidodipinonamalolekilu.pdf
    • http://www.x454.com/wp-content/plugins/super-forms/uploads/php/files/k0p4p4ur11cve9tv69vh9nm4f3/72075836209.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/360v6bbqe1rbv5tiqghuar114k/jelux.pdf
    • http://europeanprofservices.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607a52ecb3430---18037500771.pdf
    • http://amphorabeautyclub.com/campannas/file/61883228815.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099313ef41a1---tepopenujezumogibiwuj.pdf
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/16085fc0787b86---lubumipox.pdf
    • https://agsposure.org/wp-content/plugins/super-forms/uploads/php/files/9ff7782c9bbb818fd8efe685de1df1a1/84862086645.pdf
    • https://heritagelogs.com/wp-content/plugins/super-forms/uploads/php/files/qp23e3nsvn4nanvuuj1pjjt4ua/47643861455.pdf
    • http://wakingbeauty.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a70c89961c0---96391520824.pdf
    • https://adbetelparaguay.com/wp-content/plugins/super-forms/uploads/php/files/961e66cdce60d720e3f59f79d2268af5/5526049532.pdf
    • https://yuktiedu.com/wp-content/plugins/super-forms/uploads/php/files/291f5c51beaefe8e3e505b666e87c037/36455850724.pdf
    • https://www.psalighting.com/wp-content/plugins/super-forms/uploads/php/files/7b17c17a564b25d6e912a3244b412941/15524144508.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=oxford+word+skills+pdf+download
    • 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
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00013669.bin
0151ac742b714c30e04bc7257110f694227b6f81b75abbb3303c9d6cf0ba4a1b
decompressed-pdf-stream PDF FlateDecoded stream at offset 0x13669 26260 bytes
font_00_sfnt_off0000df06.bin
ffeb89eaad713c9717385028f79c9757067aafb2c2382ea8cbab0e6efe35a425
pdf-font-stream PDF embedded font (sfnt) at offset 0xDF06 6744 bytes
font_01_sfnt_off0000efee.bin
988ddf9eb2bab8499a5f4416f1167aa24a89782746cc659593cce1eb414564b0
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFEE 5288 bytes
font_02_sfnt_off00010215.bin
b0e3b967a96ff647a402beb7975b2bcba0038b09cf1c5514acbfeb9b3f805913
pdf-font-stream PDF embedded font (sfnt) at offset 0x10215 24148 bytes