Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ec7cdf5568d96c4…

MALICIOUS

PDF

91.4 KB Created: 2021-08-14 05:06:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 66efd3e4e201b2b144349de3e5a4c4f4 SHA-1: fe5686a533399ba4c9eab9078c095623b116176b SHA-256: 6ec7cdf5568d96c4d94e6e94752cf8c2716701845a0a819bc29ef684542d991b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1055.012 Process Injection

The PDF contains a large number of links, many of which point to compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent. The presence of a link farm on potentially compromised hosting suggests an attempt to obscure the final destination, likely a phishing or malware distribution site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://diagonal.org.ar/wp-content/plugins/formcraft/file-upload/server/content/files/160785dcdafc6a---bepotexizenuvexuvij.pdf In PDF document text
    • http://richmediahouse.com/admin/uploads/file/84006512039.pdfIn PDF document text
    • https://grafitpoint.ru/wp-content/plugins/super-forms/uploads/php/files/ed08e0e1e2bdfd3ec2fdb00bebf604f8/sijasinezovegow.pdfIn PDF document text
    • http://mognational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606eff2434c3e---61405691274.pdfIn PDF document text
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/1fc57dcb74694f00c6a6093cd94500a6/74573094286.pdfIn PDF document text
    • http://www.theagentpipeline.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c3fbf6d302c---nagajikuderox.pdfIn PDF document text
    • http://namhungholdings.com/uploads/ckfinder/files/janofamenimezebewadas.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/rorivikerovomokesebali.pdfIn PDF document text
    • https://victory-agency.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d8ea733908---49289574435.pdfIn PDF document text
    • http://cerrutistudio.eu/userfiles/files/70030533068.pdfIn PDF document text
    • https://f1com.ge/wp-content/plugins/super-forms/uploads/php/files/6fd4fc4855c38511a491e05cc9298d9b/najofezazowujubesezusu.pdfIn PDF document text
    • https://udachi.co.th/wp-content/plugins/super-forms/uploads/php/files/7a1ud297cldcootbu3o8470doj/97902298880.pdfIn PDF document text
    • https://pankalconstructora.com/wp-content/plugins/formcraft/file-upload/server/content/files/160d8ceed38518---zowamujisuw.pdfIn PDF document text
    • http://aggengr.com/uploads/CMS/file/mopobemosebamuwixowi.pdfIn PDF document text
    • http://magicdiscoradio.hu/userfiles/file/30793076597.pdfIn PDF document text
    • http://fantasymusic.it/userfiles/files/vuxaxupibutimuwiva.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/78742476137.pdfIn PDF document text
    • http://sarlampa.ru/upload_picture/60727243593.pdfIn PDF document text
    • http://samnakthodrahassob.com/userfiles/file/nofazevifebebeg.pdfIn PDF document text
    • https://addsfly.com/userfiles/file/wifevatipekom.pdfIn PDF document text
    • http://orgue-chantepie.info/FCKeditor/upload/file/36676673606.pdfIn PDF document text
    • https://www.rydalmereprestige.com.au/wp-content/plugins/super-forms/uploads/php/files/p1ue91ilk29og0nml5u4mdtk29/1290723146.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/6naE_Nh8_CY/uplcv?utm_term=adhyathma+ramayanam+kilippattuPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB33 16172 bytes
SHA-256: 637a9dac0afc585f1f105c2de408df99420c2eea19216aca5c902ef31b2be0e3
font_01_sfnt_off000100cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CB 17168 bytes
SHA-256: 9c7a361afadf94dcd9e66c76b32575576a22edb4b66b08c39c37b7684e8097e0
font_02_sfnt_off00012e00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E00 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00014617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14617 10524 bytes
SHA-256: 34b6ad8d65ecfec78a140d4a550162adfcd83a82acd458afce733e7a6153b435

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