Malicious PDF — malware analysis report

Static analysis result for SHA-256 153dbc38774b80a2…

MALICIOUS

PDF

87.3 KB Created: 2021-08-23 13:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: f1b73a872f982e1bdd093211be4f6c6c SHA-1: 6af2203b89c458fa5d9c1da855ad68d7bc8531f9 SHA-256: 153dbc38774b80a2b404f946082b7571dc1aaca1b3d1c674f414105dfd7624d2
156 Risk Score

Malware Insights

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

The PDF contains a link farm pointing to multiple domains, many of which are hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to lure users to malicious content or phishing pages. No scripts were extracted, limiting the analysis of direct execution vectors.

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 http://barrarioservicos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1606f5a38c3bca---puxewobifepuwebun.pdf In PDF document text
    • http://sloplast.com/userfiles/files/39243654619.pdfIn PDF document text
    • http://www.hypnotiseur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16099c741456f1---82155925835.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/kodosomafujigotuzewoxexa.pdfIn PDF document text
    • https://gea99.com/ckfinder/userfiles/files/xobutoxozidonupewadevuf.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/51079762264.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/eivjjreckjia1v2llsot77temr/75720166965.pdfIn PDF document text
    • http://satisfytech.com/ck/upload/files/notewefugalikoxajex.pdfIn PDF document text
    • https://skazkavdom.com/wp-content/plugins/super-forms/uploads/php/files/58f6ba3c19bda107d9d92fdcfd408e1c/lawupewuvedegaxiwitepo.pdfIn PDF document text
    • http://myblindz.com/fck_user_files/file/6873397291.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16071313253a1e---kotilifopomalun.pdfIn PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/c2e6227add67e89ad0395b8d251e89b8/65268609485.pdfIn PDF document text
    • http://qboardapp.com/wp-content/plugins/super-forms/uploads/php/files/b1637574e5a427e7a5b09b639df0a122/fomisixevizal.pdfIn PDF document text
    • http://dkyangmei.com/uploadfile/file/2021070610035673499.pdfIn PDF document text
    • http://hoangduy.vn/vn/files/55913498958.pdfIn PDF document text
    • http://mrsinternationalbeautypageant.com/clients/8/8c/8c0f0497d7166b07b5568c04be8084ca/File/runogireluwimatarumad.pdfIn PDF document text
    • http://zafirkort.com/uploads/files/detelosoranefabag.pdfIn PDF document text
    • https://gpuhub.net/wp-content/plugins/super-forms/uploads/php/files/e81jlbl809iti8f1efvat183gq/64757174503.pdfIn PDF document text
    • https://watfordfairtrade.org/app/webroot/img/files/darujaredofoduzusufi.pdfIn PDF document text
    • http://bunny888.com/ckfinder/userfiles/files/dunotadewituropeb.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/46h8qqo1htk3k0j0nbt460f88r/41213753837.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=macao+government+tourism+officePDF 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c912.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC912 10792 bytes
SHA-256: acc55a7ee31e04012268d6e8a4cec24a088cc4551e57d7263ea603263ca888ef
font_01_sfnt_off0000e1fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1FA 16488 bytes
SHA-256: c26743b87dfacdf0858f4b0a7ceb4ab939aa0c8d2a68f1ccae901a3bec0cb177
font_02_sfnt_off0000f908.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF908 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off0001111a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1111A 17896 bytes
SHA-256: b12aaea6309e09acfea4b296de05e1023c82ff5442774201f9c62c2a79615d57
font_04_sfnt_off00013ebb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13EBB 3464 bytes
SHA-256: 6a185ba04c161a38741053c98db7b5b30f26a88f6d84fff6fae45d1a171314e6

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