Malicious PDF — malware analysis report

Static analysis result for SHA-256 7c25b2326d0e046b…

MALICIOUS

PDF

88.7 KB Created: 2021-09-16 09:13:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: b7cf7aa1ff791889066a0b9eff63fcc0 SHA-1: e772706034052a991eb1c5726378cfe1ef545601 SHA-256: 7c25b2326d0e046bd392c2f2c40e9710360b4d2f9bca1889b63b2d4d45fcae2b
164 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, many of which point to compromised CMS uploads or disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The presence of embedded JavaScript indicates an attempt to exploit vulnerabilities or execute malicious code within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=gravity+falls+season+2+torrent PDF link annotation
    • https://dolnoslaskialarmsmogowy.pl/imgturysta/files/98642093797.pdfIn PDF document text
    • http://www.dagmarsvendova.cz/admin/js/ckfinder/userfiles/files/jodubovuba.pdfIn PDF document text
    • http://clearspace-design.com/CKEdit/upload/files/puguwe.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/72531652772.pdfIn PDF document text
    • https://www.landalastadservice.com/wp-content/plugins/formcraft/file-upload/server/content/files/161331944882d0---zezonupatuwapasepuwagis.pdfIn PDF document text
    • https://www.psk.com.au/application/third_party/ckfinder/userfiles/files/gufajidisosuxanakosotut.pdfIn PDF document text
    • http://esenkardeslerinsaat.com/resimlerfiles/biwidudaxos.pdfIn PDF document text
    • http://dungculamdep.com/fckeditor_userfiles/file/55472723541.pdfIn PDF document text
    • http://ipvoicenj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae72956d9f---ligusulogu.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/rewuvurotopekaxan.pdfIn PDF document text
    • https://fotoprint.lv/downloads/file/64198041920.pdfIn PDF document text
    • http://ultraljud.nu/bild/files/zogarixosedodawukuguxigi.pdfIn PDF document text
    • http://autowagon.it/userfiles/files/76455176410.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/78544750865.pdfIn PDF document text
    • http://iiiemjobs.com/FCK_Editor_Images/files/28394786187.pdfIn PDF document text
    • https://southernwashpros.com/nbloom/fckuploads/file/776785941.pdfIn PDF document text
    • https://limsurempat.com/contents/files/30350750411.pdfIn PDF document text
    • http://in-dapt.com/wp-content/plugins/formcraft/file-upload/server/content/files/16142184a13b71---xaniwede.pdfIn PDF document text
    • http://historico.uts.edu.co/portal/app/ckfinder/userfiles/files/65689719364.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/16133a4c152ad2---53038277217.pdfIn PDF document text
    • https://mantyobras.com/userfiles/file/zufoxofiserapotogosezug.pdfIn PDF document text
    • https://falconshipping-uae.com/userfiles/files/rufet.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b93c38c162f0d459b5b085433f73b919/26771432538.pdfIn PDF document text
    • https://tyeetomsfishing.com/userfiles/file/16475771767.pdfIn PDF document text
    • http://edmo-cars.nl/images/file/4313440039.pdfIn PDF document text
    • http://minhanh.com/files/88911923219.pdfIn PDF document text
    • http://weighlessthisyear.com/ckfinder/userfiles/files/warokobamidudunelup.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_off0000f33d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF33D 10548 bytes
SHA-256: 1c4f1eb34e82acddb7711b1b90fd144df72ba63249affaa1be98105efb26c7e1
font_01_sfnt_off00010b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B88 18732 bytes
SHA-256: 821ef0b9cc3b0aac0b227cff2b18058e5cd69d75499e42d2926f1bca1a504c4f
font_02_sfnt_off00013c7d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C7D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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