Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d3122b21109ae18…

MALICIOUS

PDF

85.0 KB Created: 2021-09-09 12:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: da6b31dbd6bfb5b8b655205a9e207f98 SHA-1: da8aaa6b49f777887c3a163e46289e8519df6131 SHA-256: 4d3122b21109ae18f375225685b297dcf836efb4292335e4e6a53fc356de3184
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating it's a link farm pointing to compromised WordPress uploads, likely to host malicious files. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document instructs users to download a password-protected archive, a common tactic to bypass gateway security. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://queure.ru/uplcv?utm_term=gta+san+andreas+zarchiver+download PDF link annotation
    • http://bilagroup.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136ab3a4284b---kepujekuwanaruza.pdfIn PDF document text
    • https://www.lsv-wittlage.de/ckfinder/userfiles/files/67741210838.pdfIn PDF document text
    • http://premiumcsp.com/uploads/files/tubitajimavedibeli.pdfIn PDF document text
    • https://aydin-elektrik.com/resimler/files/94289362546.pdfIn PDF document text
    • http://szkolaprzybranowo.pl/ckfinder/userfiles/files/76194659739.pdfIn PDF document text
    • https://pisangmanis.com/contents/files/61370986986.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/cc21d729bd89b5705851fee9984e2532/12901075720.pdfIn PDF document text
    • http://boldogelet.hu/media/juneg.pdfIn PDF document text
    • http://boatmonies.com/uploads/files/99307833820.pdfIn PDF document text
    • http://travelshops.pl/userfiles/file/81931755148.pdfIn PDF document text
    • https://aymexco.ro/ckfinder/userfiles/files/71596914896.pdfIn PDF document text
    • http://madmojo.com/fckupload/file/fogegulufadipi.pdfIn PDF document text
    • http://jornalespacoaberto.com/app/webroot/datafiles/editor/files/6082080945.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/22177943787.pdfIn PDF document text
    • https://www.bluegreenshouseboats.in/wp-content/plugins/formcraft/file-upload/server/content/files/1613507aac5653---52153480270.pdfIn PDF document text
    • https://yuktogel.com/contents/files/piputera.pdfIn PDF document text
    • http://hondatayho.vn/images/ckeditor/files/18766495061.pdfIn PDF document text
    • http://bharatdarshan.net/rgroup/ckfinder/userfiles/files/88102363622.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/kasezinibenikutikemata.pdfIn PDF document text
    • http://chemtron-vostok.ru/media/file/supubilujikop.pdfIn PDF document text
    • https://snoman.mb.ca/ckfinder/userfiles/files/40940713469.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/solet.pdfIn PDF document text
    • http://osullivanspressurewashing.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303b0f0194a---ronutepesubi.pdfIn PDF document text
    • 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_off0000e474.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE474 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC8B 10720 bytes
SHA-256: 40fa206087b5df7639324acb9935b5d73d6d1dc5f4345559b89d4e65903eea8b
font_02_sfnt_off00011539.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11539 18696 bytes
SHA-256: 11d148c50486c42bd974807070e4a373171986773d25dd04b4e06eaef3e1adaf

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