Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d82f368383c4ac3…

MALICIOUS

PDF

81.2 KB Created: 2021-09-15 14:53:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: baebd000a4ce719e1124e7b7143f4bbc SHA-1: 27a0e57a7cf8406a1d1ee8a140555428d7066b70 SHA-256: 7d82f368383c4ac33fc986a40afb4e0440e4a2b7e40d26db3095e7e9f9cd348d
156 Risk Score

Malware Insights

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

The PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or malware distribution intent. It contains numerous embedded URLs, many pointing to compromised websites or disposable domains, suggesting a link farm designed to redirect users to malicious content. The document body is unreadable, but the heuristic firings strongly suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://catamma.ru/uplcv?utm_term=android+one+clear+cache PDF link annotation
    • http://xn----gtbercbfedtm3b.xn--p1ai/admin/ckfinder/userfiles/files/35396527519.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/fasuma.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/fibikamowotivowodup.pdfIn PDF document text
    • https://www.elektrobetrieb-scholz.de/wp-content/plugins/formcraft/file-upload/server/content/files/1614137e7f0277---nufunakubulal.pdfIn PDF document text
    • http://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b5e1a82679---bipatewemexumusug.pdfIn PDF document text
    • https://turkuazhost.com/calisma2/files/uploads/24960023796.pdfIn PDF document text
    • http://mirsistem.com/depo/sayfaresim/file/96040754975.pdfIn PDF document text
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/57a100aa8940d8e43d0253f0b931aab2/tigepek.pdfIn PDF document text
    • http://orthocarecentroortopedico.it/userfiles/files/koronawumewozolugu.pdfIn PDF document text
    • https://sketchup360.vn/wp-content/plugins/super-forms/uploads/php/files/49uovsabdhr1i8ihjlk2p6cjth/27948030669.pdfIn PDF document text
    • http://xn--b1agpbmdtf.xn--p1ai/upload/file/51410188824.pdfIn PDF document text
    • http://abcbyspu.net/ckfinder/images_store/files/mirewov.pdfIn PDF document text
    • https://airbays.com/userfiles/file/15667773421.pdfIn PDF document text
    • http://xn----7sbev0bhje.xn--p1ai/images/news/file/niwedoxipafemojaxa.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/gawipepuzojifo.pdfIn PDF document text
    • http://evolution-dev.com/file_media/file_image/file/84597866104.pdfIn PDF document text
    • http://rqconsultores.com/userfiles/file/8038592363.pdfIn PDF document text
    • http://risme.vn/files/99177952463.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/48433992532.pdfIn PDF document text
    • https://ietc-oman.com/userfiles/files/14391272938.pdfIn PDF document text
    • http://vimbark.sk/editor_uploads/files/99127929152.pdfIn PDF document text
    • http://wohingltd.com/userfiles/temebir.pdfIn PDF document text
    • http://jl-vacuum.com/upload/files/varerovufojuxew.pdfIn PDF document text
    • http://rlmlaw.com/images/edit_images/file/sisibisazofap.pdfIn PDF document text
    • http://www.cpnatacao.pt/backoffice/ckfinder/userfiles/files/webezifisojagubejowu.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_off0000dae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAE8 10180 bytes
SHA-256: 21611cf79d3b97b43caf2d0e1c1d6496a852b165616f4d7c801c22718c227038
font_01_sfnt_off0000f18c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF18C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001099e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1099E 17624 bytes
SHA-256: 0533fdf83b049519183b5e608ac09cdb55d725e4e86a85795665198d2a8119f3

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