Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c7b3c0353dcab85…

MALICIOUS

PDF

77.1 KB Created: 2021-09-12 21:10:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 97ee3bb2a44939ff7520916b7fdef176 SHA-1: d98f244043681fd7f66a5986e6e4b1e30260e028 SHA-256: 7c7b3c0353dcab852adaac862dbc6f84030089ee428aa6ba952c5d2d1989f43c
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a link farm pointing to various PDF files hosted on potentially compromised or disposable domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were directly extracted, the structure and URL findings are indicative of a malicious PDF designed to lead users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 7

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://dfwarbitrator.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/15253760908.pdf In PDF document text
    • http://kahasat.cz/data/file/74118908876.pdfIn PDF document text
    • https://hazeloyun.com/calisma2/files/uploads/vuruf.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/81854703253.pdfIn PDF document text
    • https://shiprapublication.com/uniformkontakt/userfiles/image/files/dawizesib.pdfIn PDF document text
    • http://youil.org/userData/board/file/miligipupixovonetipo.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-6/20210906012638920586.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/97071690219.pdfIn PDF document text
    • http://drivingtesttips.ie/fckeditor/userfiles/file/mapufilozaxexogataxiwejuv.pdfIn PDF document text
    • https://jiu-hang.com/upfiles/editor/files/89247784286.pdfIn PDF document text
    • http://www.klimavill.com/data/editorfile/lepukapejupazezegaxijos.pdfIn PDF document text
    • http://kubkao-kubpla.com/userfiles/files/xejoromodunanafa.pdfIn PDF document text
    • https://ivfnna.gr/wp-content/plugins/super-forms/uploads/php/files/9e1e23e9fba227cbd5d3e18a6f19a179/37132568245.pdfIn PDF document text
    • https://storage-in-motion.com/wp-content/plugins/formcraft/file-upload/server/content/files/161375a76ba8ad---47669746766.pdfIn PDF document text
    • http://bagpack.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/16137e36787cf8---64531544761.pdfIn PDF document text
    • http://bluecars.pl/userfiles/file/nujimefenilisaka.pdfIn PDF document text
    • http://kaushalacademy.org/ckfinder/userfiles/files/jesevunusovaxifif.pdfIn PDF document text
    • http://dcbestwings.com/uploads/files/waposidojenamixofozix.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e3d4c8368e---75638739745.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/jf4gla072dd3g2cqci9lfvdno3/livisakakopalopiva.pdfIn PDF document text
    • https://viettincapital.vn/upload/files/mepotalatubasi.pdfIn PDF document text
    • https://eksiliotomotiv.com/upload/ckfinder/files/karegasokukotisokovixor.pdfIn PDF document text
    • https://chilegastronomia.cl/uploads/userfiles/files/7313147400.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/51470744948.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=java+ios+developmentPDF 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_off0000ca65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA65 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e27c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE27C 10508 bytes
SHA-256: 4a1bcc85e061dac674550fdf19bb4a58596456455fb13c4e4285d9bfcee1e07e
font_02_sfnt_off0000fa67.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA67 17396 bytes
SHA-256: 513ad18e53b8ef2ac4b9ccfc3df78e2da718b1a126f367320b3d37a2c33b6767