Malicious PDF — malware analysis report

Static analysis result for SHA-256 617c7883f6f89f4f…

MALICIOUS

PDF

81.4 KB Created: 2021-09-06 21:51:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 13ca83380f03ace7d5dfc21cb269f080 SHA-1: 2a0c8a50134fb20db6645c1a7a61d48022382b0f SHA-256: 617c7883f6f89f4f89a9c9709e962cef5944d7ad16da51d2e348744fddd1ea84
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was identified as malicious by ClamAV and an ML classifier. It contains multiple embedded URLs that form a link farm, with several pointing to compromised WordPress upload directories. These links are likely intended to redirect users to phishing sites or download further malicious content. No scripts were extracted, but the structure suggests a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/fdef7e4e622d5358a55f57376407603a/18380543042.pdf In PDF document text
    • https://ijp2.com/contents//files/limogopadepametag.pdfIn PDF document text
    • http://lsneotek.com/ckupload/files/witikeromolasuxajitega.pdfIn PDF document text
    • https://xn-----6kcabagcgfjsxjciriy6alkh6a7aqk.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/cd9f12cb4d703b9556f8846b8e08a144/xotibagurunefekuxi.pdfIn PDF document text
    • http://huile-de-nigelle.info/userfiles/file/xetumovebime.pdfIn PDF document text
    • http://harperfamilyreunion.net/clients/3/35/3566a42c83b0accea4ba2bdfee5c7976/File/kijegodido.pdfIn PDF document text
    • http://xn--90ad5ackt1d.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/12bccebc978ea0865d60f0b46a06033d/kilikuseguwoxotusoto.pdfIn PDF document text
    • https://secolink.sk/userfiles/file/tevese.pdfIn PDF document text
    • http://edu-tur.ru/userfiles/file/tuvirugune.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/pudevivedemeg.pdfIn PDF document text
    • https://izharfoster.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608e218c2b0bd---8826613914.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/64294059732.pdfIn PDF document text
    • https://action-roofing.com/wp-content/plugins/super-forms/uploads/php/files/9c781046162eff87b3abac82c2a3a10c/83814915152.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/lowuwivagemigizazax.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021071304451681.pdfIn PDF document text
    • https://tasteadmin.com/ckfinder/core/connector/php/custom/wysi_uploads/files/60227358290.pdfIn PDF document text
    • http://allegroescrow.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c7a5fda389c---53156652432.pdfIn PDF document text
    • http://instandee.com/Images_upload/files/65316619162.pdfIn PDF document text
    • http://voszveszprem.hu/_user/file/91263649142.pdfIn PDF document text
    • http://nek.ua/wp-content/plugins/formcraft/file-upload/server/content/files/1607c9de591452---terukagun.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=ms+word+hyperlink+to+specific+page+in+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D9 17592 bytes
SHA-256: 69cdc09ce4ee1299e393e833df355a71497c055b1888f5043585156454248eb4
font_01_sfnt_off00010669.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10669 11184 bytes
SHA-256: e9d6f9d28364e2c7dd92f3c1c10ac038e39c4b0180d9f460509c8be7356e4f96
font_02_sfnt_off0001206e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1206E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1