Malicious PDF — malware analysis report

Static analysis result for SHA-256 e55bc82a5e3fbb74…

MALICIOUS

PDF

84.3 KB Created: 2021-06-28 05:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a77f77bb45e04c45548a17d3b6d82742 SHA-1: 6e71985d2b22b0329d001885786e3621b0b010b3 SHA-256: e55bc82a5e3fbb742446c258e40217d0a913dbfd2d0b83eded037357516cb682
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan distribution attempt. It functions as a link farm, containing numerous embedded URLs that point to compromised WordPress sites. These links likely lead to further malicious content or phishing pages, aiming to trick users into revealing sensitive information or downloading additional malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://philabc.ru/uplcv?utm_term=first+communion+hymns
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/fa8789028c333f058c264de78a13f4f5/60489027301.pdf
    • https://polinagerz.ru/wp-content/plugins/super-forms/uploads/php/files/k1q74j75mtka5856h6kqkufbha/vosupafa.pdf
    • https://www.ikedatosou.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607d3b22d4c33---mojovexokesujugimelule.pdf
    • https://fellowpeo.com/wp-content/plugins/super-forms/uploads/php/files/48d51a657bb173716fa32fc91f50d580/sixutavisowagarepisux.pdf
    • http://www.homefacelifters.com/wp-content/plugins/super-forms/uploads/php/files/c7d3aabd0f20a2712198700c3568a136/memakunubojaneruwobokojaj.pdf
    • https://thewentworthco.com/wp-content/plugins/super-forms/uploads/php/files/83q1nvofam3d7r1nmeia7l3496/71617270690.pdf
    • http://katachizu.com/img/news/files/muxonubozuwepukawabul.pdf
    • http://nnk.gr/wp-content/plugins/formcraft/file-upload/server/content/files/160731dbc1b03a---bonagav.pdf
    • https://comodee.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609e3809ceb21---492905751.pdf
    • http://yilip.net/userData/board/file/36073228824.pdf
    • http://sola-brothers.com/userfiles/file/kinakipamajazub.pdf
    • http://mdfgiare.com/upload/files/94891719483.pdf
    • https://frennphotography.com/wp-content/plugins/formcraft/file-upload/server/content/files/160787d2747c4e---bebogo.pdf
    • https://wita.lt/images/files/kataliduz.pdf
    • https://msr-hudsonproperties.com/wp-content/plugins/super-forms/uploads/php/files/f116cb4826f8435c84bc79d14f541b69/lupetux.pdf
    • http://zjpjxt.cn/upload/uploadfile/file/18365999829.pdf
    • https://mcrlclient.com/ckfinder/userfiles/files/lokolu.pdf
    • https://ecef-groupe.com/wp-content/plugins/super-forms/uploads/php/files/5g91j8mra1ior4nbov1aakpf92/63043947893.pdf
    • http://fantasypartyentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/160afe72fdf689---xofufi.pdf
    • https://www.toptalentusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606c861c7f7f9---24868808570.pdf
    • http://mouaumfb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078108d9b102---32669282477.pdf
    • 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_off0000e70d.bin
82ef2fef1db70e232c0b4ba764cca764059bd29ea25fb2b322d19e5b7de0e3ff
pdf-font-stream PDF embedded font (sfnt) at offset 0xE70D 17056 bytes
font_01_sfnt_off00011380.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x11380 16792 bytes
font_02_sfnt_off00012b97.bin
cf558e7e8be771658142110382bbd8b633cd14df1f6c642526a714cd9f11a054
pdf-font-stream PDF embedded font (sfnt) at offset 0x12B97 10348 bytes