Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b2e2584cbffb30c…

MALICIOUS

PDF

89.1 KB Created: 2021-08-04 16:23:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 44e726e482618316ec2c2de64c7bd92b SHA-1: 2a046ca3e88260f9dc17a2ef08acc3c358470eb2 SHA-256: 2b2e2584cbffb30cf820bd67aee1e5c1d0e8da362118d5ae42923ab3221e966f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links pointing to various websites, many of which are hosted on compromised WordPress installations or disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of a link farm suggests an attempt to obscure the ultimate destination or to leverage SEO poisoning for wider reach.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://xn--rssx31a7tec6p.com/upload/userfiles/files/20210716134910.pdf
    • http://istrouma1971.com/clients/9/9b/9b88b062b8d6af44b28e209fcb06d7d5/File/22283736926.pdf
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f4942e2ce8---divexerefemenoloziwerutob.pdf
    • https://jnvhardoi.org/ckfinder/userfiles/files/xakavatimezudopesamivu.pdf
    • https://www.verpoort-bouw.be/wp-content/plugins/formcraft/file-upload/server/content/files/1606f44cc9ece7---jegixefuza.pdf
    • https://binarbaidfabrication.com/public_html/userfiles/file/dobopujiwevumanewo.pdf
    • http://elma1.ru/!upload/files/65472186989.pdf
    • http://philippinesroadshow.com/wp-content/plugins/super-forms/uploads/php/files/bf5a8d58167b5bb3d02612842f26c5a5/60191318048.pdf
    • http://www.sarajevo-inn-grunewald.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609cb55de3b93---61014185635.pdf
    • http://hoangminhceramics.com/app/webroot/uploads/files/lawuxetekowoxudegotuwupe.pdf
    • http://countrysquirefoods.com/wp-content/plugins/formcraft/file-upload/server/content/files/160af85cd19b55---88021829014.pdf
    • https://pjkconstruction.ca/images/file/1203497668.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/29692464927.pdf
    • https://growmytruck.com/wp-content/plugins/super-forms/uploads/php/files/31c9164e512982b58a010afbfb3b0fd3/punekufiwejujukusev.pdf
    • http://sorokolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nasigame.pdf
    • https://readandenjoy.ae/userfiles/files/pezij.pdf
    • http://daiichihr.com/uploads/news_file/43839258633.pdf
    • http://noithattamphuong.com/upload/files/nogibuxugedizaboni.pdf
    • http://www.odnpoznan.pl/fotki/file/file/kakusi.pdf
    • https://lolakarimova.uz/ckfinder/userfiles/files/zinusajidenikakomun.pdf
    • http://whatdwellswithin.com/file/ramizotagikazo.pdf
    • https://fetogram.ir/images/upload/files/65466086893.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/160906fa00573a---39454183004.pdf
    • http://xn----8sbpvg0afdbe.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/uhg2nsj97fgikn887256ojrem1/55763166226.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=500+essential+words+for+ielts
    • 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_off0000fb58.bin
0795fee0efef0ea474d6d975a4ac43d043b404c40346c3948a12a5854c103c67
pdf-font-stream PDF embedded font (sfnt) at offset 0xFB58 10592 bytes
font_01_sfnt_off000113c0.bin
50da5d81275e5475fe922f8c994946f696b070e6ee6a7c73790e5f8c305b1f1e
pdf-font-stream PDF embedded font (sfnt) at offset 0x113C0 16336 bytes
font_02_sfnt_off00013dec.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x13DEC 16792 bytes