Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fd086348b6c6d4a…

MALICIOUS

PDF

90.1 KB Created: 2021-09-17 12:31:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2916ba0a39e3191c2d0cc73b0688f732 SHA-1: 7a1a46bda8b641f2cfe31f0a024b4f7afbc855ff SHA-256: 6fd086348b6c6d4ad7a5e5b86aac6c5949d9d89da9c7cb913fdffb2804a697a4
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains numerous links to external websites, many of which are hosted on disposable domains or compromised CMS uploads, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, and the document body was unreadable, but the heuristic findings clearly point to a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://highlander-inn.com/assets/userfiles/files/fidodinujibusabe.pdf In PDF document text
    • http://kleinschadenexperte.com/userfiles/file/9234838373.pdfIn PDF document text
    • https://salvamontbihor.ro/app/webroot/files/userfiles/files/kalofutafesalago.pdfIn PDF document text
    • http://shannonlakeestates.org/fck_images/file/25070470978.pdfIn PDF document text
    • http://inventory-acepipe.com/images/uploads/files/23531353902.pdfIn PDF document text
    • https://linhquan-group.com/upload/ck/files/sesil.pdfIn PDF document text
    • https://aldea.work/wp-content/plugins/super-forms/uploads/php/files/b996ca2cb13e9b90fcc6501fc06b4597/16793103062.pdfIn PDF document text
    • https://spotiverify.com/ci/userfiles/files/dofovuvujotomixoxonanew.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/87257841052.pdfIn PDF document text
    • http://www.1atlanticfunding.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd7a3bbd98---86886481068.pdfIn PDF document text
    • https://francoisdaulte.com/ckfinder/userfiles/files/76968173161.pdfIn PDF document text
    • https://biodent.ro/m4fm_files/m4news/ck-uploads-files/9416800627.pdfIn PDF document text
    • http://dabien.co.kr/wp-content/plugins/formcraft/file-upload/server/content/files/161318c9b05c5d---31221775651.pdfIn PDF document text
    • http://dhf-china.com/d/files/maborodub.pdfIn PDF document text
    • https://excore.hu/ckfinder/userfiles/files/zetowetov.pdfIn PDF document text
    • https://prospr.fr/ckfinder/userfiles/files/47894679916.pdfIn PDF document text
    • https://radmangroup-ye.com/rgfiles/file/moxidenepoganewuzesa.pdfIn PDF document text
    • http://xsjsbzrw.com/uploads/files/93998699407.pdfIn PDF document text
    • http://sk-uralstroy.ru/uploads/files/3079795892.pdfIn PDF document text
    • http://dreamcatcherltd.com/userfiles/file/3927753811.pdfIn PDF document text
    • https://austdoorcaocap.com/upload/files/48222976846.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/96486476928.pdfIn PDF document text
    • https://knoxvilleremembers.com/media/burejedotiladij.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=android+multiple+screen+supportPDF 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_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001169e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1169E 17104 bytes
SHA-256: 96dcb042778447eb5eeb12da4ee4d8a93baf13766c5916ab5f32b8a72cae9370
font_02_sfnt_off000142c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x142C8 10596 bytes
SHA-256: f277e697d8ed2a51aa982950cab98115a1b3cfc886062cacef182af1da93d0d3