Malicious PDF — malware analysis report

Static analysis result for SHA-256 3aa917f5cc702e6b…

MALICIOUS

PDF

90.6 KB Created: 2021-09-03 08:14:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95cd8269ec5a838bdb9667dbd1396cd9 SHA-1: a1599629d4c29786c1134e1e0a6c7867122bb2c4 SHA-256: 3aa917f5cc702e6b09ac022458de2683826e140d34b33508db3a2f886064145a
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm with numerous URLs pointing to various websites, many of which appear to be compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the structure and URL patterns are consistent with a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://thucphamchucnangmy.vn/uploads/files/99361964874.pdf In PDF document text
    • https://stiff.pl/ckfinder/userfiles/files/23301219569.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/jojudako.pdfIn PDF document text
    • http://corising.info/sa_upload/userfiles/file/20210721152534.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1607a59152a4d8---rutobulivolafudal.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606d542e675db---39330707815.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/38283565046.pdfIn PDF document text
    • https://malimbe.africa/wp-content/plugins/super-forms/uploads/php/files/ca3c04b1236161737e2fcedabdffa1e9/bajusefe.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609ac44eadb48---vekidalakotisidove.pdfIn PDF document text
    • http://exmar.it/foto_fck/file/ladibipufi.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/477fbb8cf78ba668826eb1eb5db85d1f/rodez.pdfIn PDF document text
    • https://goactive.hu/wp-content/plugins/super-forms/uploads/php/files/d47165c8b06bc5f2cb69973eb737a9ac/21652590682.pdfIn PDF document text
    • http://hakkabrothers.com/userfiles/file///95351755856.pdfIn PDF document text
    • https://braintreeclinics.com/app/webroot/img/files/27771288753.pdfIn PDF document text
    • http://beta-rc.com/upload/files/16323730904.pdfIn PDF document text
    • http://cdhsalumni.com/clients/28864/File/jewuguku.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/ul6udd383cq6j8g1ij1kmhpbi0/27714171972.pdfIn PDF document text
    • http://livingkaneohe.com/userimages/defitimasobuwulalipasune.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202108281056042620.pdfIn PDF document text
    • https://www.colegiodesafio.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/160a039b414c7c---70368382983.pdfIn PDF document text
    • http://elmaryapi.com/ckfinder/userfiles/files/puzebamizagixupujaxoke.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/8789e61b89963dded3eee2d3c5055319/85598071902.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/24237975957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=conover+wood+lathe+manualPDF 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_off0000fa6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA6F 19368 bytes
SHA-256: b4a45d61ed78874704ece95bf1ff4a31ac718b0dda94fe0a137840315dc9b689
font_01_sfnt_off00012cc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12CC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000144e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x144E0 10536 bytes
SHA-256: d88ba52a129a907996abbf90c82471574ec28bc8912b02c4a0b798c648112c0e

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