Malicious PDF — malware analysis report

Static analysis result for SHA-256 eaa3d0fe2c7001f9…

MALICIOUS

PDF

98.1 KB Created: 2021-08-15 04:45:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 3c75c70bd13f6982fad2678b5a34c7f4 SHA-1: 14672b913936a03108f7e4211643c76be1062a32 SHA-256: eaa3d0fe2c7001f92bd254740ec2b666b06a247436bb7df4adf8c12f03fa0023
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many pointing to compromised CMS upload directories, suggesting a link farm or SEO spamming operation. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The presence of embedded URLs and the nature of the links indicate a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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 https://catamma.ru/uplcv?utm_term=car+racing+games+2+player+free+download PDF link annotation
    • http://mko-yug.ru/wp-content/plugins/super-forms/uploads/php/files/82d309e7193685bbc3a45f61f609c169/20516897359.pdfIn PDF document text
    • http://www.siphonicflowmandiri.com/upload/files/77509584973.pdfIn PDF document text
    • http://starke.ca/clients/84205/File/3932607789.pdfIn PDF document text
    • https://avonsteel.com/UserFiles/file/dupugubuxojemixufukifafi.pdfIn PDF document text
    • http://originalavto.ru/userfiles/file/wimimatafofonurejok.pdfIn PDF document text
    • https://arte-salon.ru/upload_picture/dugobaxibodaneronek.pdfIn PDF document text
    • http://ahdongjiu.com/upload_fck/file/2021-5-7/20210507025638784264.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/96202579316.pdfIn PDF document text
    • http://adainst.com/uploade/files/20210626092433.pdfIn PDF document text
    • https://used-machinetools.ro/app/webroot/files/userfiles/files/majig.pdfIn PDF document text
    • http://telmeed.com/web/ckfinder/userfiles/files/56874989699.pdfIn PDF document text
    • https://cissud.com/uploads/ck_editor/files/41674806737.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/160984da571833---30449512194.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/pee3fecuvcrma46qauonn1dbv6/30918618958.pdfIn PDF document text
    • http://www.justgiveahand.org/wp-content/plugins/formcraft/file-upload/server/content/files/16091dfe48b276---78590751923.pdfIn PDF document text
    • http://hephatha100.com/clients/4/45/452f9a9cd3514f90eb92b3b4734a1f1d/File/xigovaruxopafagowokal.pdfIn PDF document text
    • https://deewo.de/wp-content/plugins/formcraft/file-upload/server/content/files/160c06e57caea0---bemejajekovirivinavawox.pdfIn PDF document text
    • http://vladjurnalist.ru/archive/file/16681945681.pdfIn PDF document text
    • https://cokhivietuc.com/img-vietuc/files/talusi.pdfIn PDF document text
    • http://whkmradio.com/userfiles/file/xujutisazanakixexewideser.pdfIn PDF document text
    • http://haki.vn/uploads/files/mivupekoxilonawupiwa.pdfIn PDF document text
    • https://teenvolunteer.org/wp-content/plugins/super-forms/uploads/php/files/ccf09609ab8262188411c6e0f6b35478/vuwatesosijagitirefipolil.pdfIn PDF document text
    • http://dodici12.ru/wp-content/plugins/super-forms/uploads/php/files/sl9vfpbk9rm43qjq2jkb705ln6/lilorekepazujukovapuzo.pdfIn PDF document text
    • http://pascalparrot.com/uploads/assets/file/31445720593.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_off000119e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E1 11216 bytes
SHA-256: 79303f5d9e253da335b75e8d65b3b0c6da426f4f381af56cd4ca861d5adfd430
font_01_sfnt_off0001340d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1340D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00014c1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C1F 16788 bytes
SHA-256: 0d198864afce66bea6e4e8ce6da224d7cafb26a20062dbdb767d4e4c6dd28312

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