Malicious PDF — malware analysis report

Static analysis result for SHA-256 c154328bdb57d243…

MALICIOUS

PDF

93.7 KB Created: 2021-06-29 13:19:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cee7bd9f2028469318b0fb1bfba715f4 SHA-1: db8ec4a2cdc8034460f00ed9c3a8990338866372 SHA-256: c154328bdb57d24326e5b73c9b17806b93ada19676f705347257a9dc57253a05
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous links, many pointing to compromised CMS uploads or disposable hosting, suggesting it functions as a link farm to distribute malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URLs strongly suggest an attempt to redirect users to harmful sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9924

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://naseeha.org/wp-content/plugins/super-forms/uploads/php/files/11d0b33f4e342683c7b4a0a89c3866fd/74552972074.pdf
    • http://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/1609b0c605f739---kagilekelozibe.pdf
    • https://borderpak.com/wp-content/plugins/super-forms/uploads/php/files/6c11e98ac1ff826dae2dc89737bdc5a5/lusefujosow.pdf
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/160ba1bd4d73dd---zupikipipul.pdf
    • https://www.limratechnologies.net/wp-content/plugins/formcraft/file-upload/server/content/files/16072e34f74fcf---41301084252.pdf
    • http://lichnyiybrand.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1606c96fe89fd6---75959581564.pdf
    • http://gingerwooddesign.com/wp-content/plugins/formcraft/file-upload/server/content/files/160756ecdf3c7b---75030046231.pdf
    • https://dungcuruamui.com/wp-content/plugins/super-forms/uploads/php/files/i6kt7ld8dgcjo458q46tbc6ad6/metotopukujazo.pdf
    • http://toeicspeaking.net/_UploadFile/Images/file/dokonalerabasilu.pdf
    • https://amirep.com/wp-content/plugins/super-forms/uploads/php/files/797662c25a6756f8d05d57ad100ffa76/madepudiwobobe.pdf
    • https://www.havanasalsa-dance-tours.com/wp-content/plugins/super-forms/uploads/php/files/f65edf6741fb6ca7645fc0c4bc4dff39/76003164158.pdf
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/160757ef23ca31---2660205242.pdf
    • http://atut-biuro.com/uploaded/file/67971356025.pdf
    • http://allprintusa.com/admin/images/file/70832898591.pdf
    • http://stopasbestos.ca/wp-content/plugins/formcraft/file-upload/server/content/files/160adb6313b25a---vudejotimik.pdf
    • http://windcampus.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608c27960ca0d---padew.pdf
    • http://plenaadoracao.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160bc3c00d710d---65270116516.pdf
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/btbqnvek1v5si0km53n1pgn160/27152117824.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e15658d7ff97a562da4596ad5caa62de/55849497994.pdf
    • https://www.kalirich.com/wp-content/plugins/super-forms/uploads/php/files/2uibf93mv7ih28n07pk341lkt0/mutulobivixifis.pdf
    • https://www.expoagrogto.com/wp-content/plugins/super-forms/uploads/php/files/4h7bftcqpjajff0mkammln4eo0/depenis.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/16078134909561---zurubaropebesekinogunu.pdf
    • http://ozari-ua.com/files/file/8997804449.pdf
    • http://www.moteco.ro/wp-content/plugins/formcraft/file-upload/server/content/files/160c596bc97a94---25506295759.pdf
    • https://torrentclub.vip/wp-content/plugins/super-forms/uploads/php/files/omgbel5nvdagd4123ebj9hc7nh/fojulawezadururalenik.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=cemu+breath+of+the+wild+motion+controls
    • 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f164.bin
fd494554c7a7a2c4488382a78096c535ff133766c7221992be4f6a58596b2467
pdf-font-stream PDF embedded font (sfnt) at offset 0xF164 16164 bytes
font_01_sfnt_off000106d6.bin
df305e486ffd010850e9b78aa128d5be8fe27e7fc7ff1383a82ec795ff959964
pdf-font-stream PDF embedded font (sfnt) at offset 0x106D6 18408 bytes
font_02_sfnt_off0001353f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1353F 16792 bytes
font_03_sfnt_off00014d56.bin
e91f0c0a0b00798f2fa370ae2114882d00be5e1fb26feed0220f7d8fd92339a2
pdf-font-stream PDF embedded font (sfnt) at offset 0x14D56 11100 bytes