Malicious PDF — malware analysis report

Static analysis result for SHA-256 9fe126551efd2cb9…

MALICIOUS

PDF

128.9 KB Created: 2021-07-25 19:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 14a49ab36c2769e7b4a6f3efb6a11964 SHA-1: 5ec20915fd55f8786b9d49224f1dca36f91d98a7 SHA-256: 9fe126551efd2cb959c2a78d9e404a2e5825859777e80a1677493d100defb4d6
156 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. Numerous heuristics indicate the PDF is a link farm pointing to compromised WordPress upload directories, suggesting it's designed to redirect users to malicious sites. The presence of multiple unknown URLs hosted on compromised CMS platforms reinforces this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://lbs.ac.at/wp-content/plugins/super-forms/uploads/php/files/iaj55dh2qugf3vcb091hv5fiia/63894681380.pdf In PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/369351337384a1ea732ccf48f9dc29ab/sasiluleveramabageliwum.pdfIn PDF document text
    • https://abril.pe/wp-content/plugins/super-forms/uploads/php/files/uskko8lfkibc5d6cbakgongcui/gananubunaxowilogabogodi.pdfIn PDF document text
    • http://lab4050.com/upload/editor/file/gugajoderakusika.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/65accecf59ad6fc4538de8b32efb23ed/33596626977.pdfIn PDF document text
    • http://asu.com.vn/wp-content/plugins/super-forms/uploads/php/files/svpvvcql713k3s9accojgb3f8t/1043873361.pdfIn PDF document text
    • http://www.vivelamusica.es/wp-content/plugins/formcraft/file-upload/server/content/files/1607b5fd630e78---87228039201.pdfIn PDF document text
    • https://g3az.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b3a9c784dac---12497956677.pdfIn PDF document text
    • https://steammining.com/userfiles/file/makajo.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/rdfuvput8si6p9ev6sbkhc8r6m/27661219307.pdfIn PDF document text
    • http://alimentosldm.com/userfiles/file/pivejab.pdfIn PDF document text
    • https://canadianrelocation.net/wp-content/plugins/formcraft/file-upload/server/content/files/160f9d6d243a46---jopanegoxajekupejizamakot.pdfIn PDF document text
    • https://www.breastcancerfoundation.in/wp-content/plugins/super-forms/uploads/php/files/7894b804c253b358bab5e48d6703a930/55034454880.pdfIn PDF document text
    • https://acrgruppe.de/userfiles/file/gedatuzuxuwiwobexiv.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/60891117905.pdfIn PDF document text
    • http://networkinglikepro.com/ckfinder/userfiles/files/posomu.pdfIn PDF document text
    • http://limitlessillusion.com/wp-content/plugins/super-forms/uploads/php/files/cbcfdc3beeb2eef80dd93e919a14e280/lakidixobudiwus.pdfIn PDF document text
    • https://kabelkyaobuv.sk/editor_uploads/files/jezuno.pdfIn PDF document text
    • http://inlikeflintlogistics.com/wp-content/plugins/formcraft/file-upload/server/content/files/160adeccd54868---rizinarusuzumituzobo.pdfIn PDF document text
    • https://homeaestheticsllc.com/wp-content/plugins/super-forms/uploads/php/files/a3ed086aaa6bcccc6a865e34bd2cdc4e/maluxilojo.pdfIn PDF document text
    • http://upservice.expert/admin/ckfinder/userfiles/files/48760949348.pdfIn PDF document text
    • https://stefandes.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c5820bcb767---mevilit.pdfIn PDF document text
    • https://www.pal-kont.hu/wp-content/plugins/super-forms/uploads/php/files/5bb9cb7707b801c672ce8142bd832760/xalipoji.pdfIn PDF document text
    • https://p99.tw/pro_pic/files/lixogunumesefudoxodibo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=aga+khan+laboratory+online+report+checkPDF 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_off000179cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x179CB 10812 bytes
SHA-256: cf5449c6d85e30c6db708e5d786fa76c14553eeb581efa08e766dc87b5e3bde7
font_01_sfnt_off0001927d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1927D 17076 bytes
SHA-256: f2d2e3be62790a3b823276d22f021ca5c0c6df2bef576b4e48bb836f4d96055a
font_02_sfnt_off0001ab90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1AB90 18620 bytes
SHA-256: ff8312db58bf61b27b23a1b181c381762c94cc99d22441289457426088355558
font_03_sfnt_off0001dc5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1DC5B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1