Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3312c006506d64d…

MALICIOUS

PDF

68.8 KB Created: 2021-09-25 10:10:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0cdaa532162fc9a4d816758242172ffe SHA-1: daa1da2a9f68cd092f355faa854b587dd69e05cf SHA-256: f3312c006506d64dfbb01336f81604b707a7a425aa8638c3ca004244e500ec6f
156 Risk Score

Malware Insights

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

The PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to compromised websites and potentially malicious PDF files. The presence of external URIs and link farm heuristics suggests an attempt to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://h16hr15k-h19hr37urn.com/contents/files/gemumewojuxatuzilopaxuze.pdf In PDF document text
    • http://leoclubmarsala.it/userfiles/files/90303627149.pdfIn PDF document text
    • https://emailchopper.rockeit.com/userfiles/file/27660470044.pdfIn PDF document text
    • https://majubesar.com/contents/files/74891445936.pdfIn PDF document text
    • https://precisionautoandac.com/wp-content/plugins/super-forms/uploads/php/files/b93c38c162f0d459b5b085433f73b919/26771432538.pdfIn PDF document text
    • http://hoteldanang.com/uploads/images/files/70986624348.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/8gc9tdgv4g0hhmldgik7a0pn0p/sojonidiruwarodosejemi.pdfIn PDF document text
    • https://sanipacific.com/attachment/file/xibasiweretotilisovizabag.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/vijopivopedonogufetubizex.pdfIn PDF document text
    • http://emanuelarombiarchitetto.eu/userfiles/files/53515630624.pdfIn PDF document text
    • http://lagerunda.it/public/upload/file/6153671733.pdfIn PDF document text
    • https://travellifeafrica.com/ci/userfiles/files/zepad.pdfIn PDF document text
    • http://abwclayton.com/uploads/files/65362179894.pdfIn PDF document text
    • http://wakabaeducation.com/userfiles/file/78484785093.pdfIn PDF document text
    • https://kligi.viart.lt/ckfinder/userfiles/files/76118565988.pdfIn PDF document text
    • https://flavio-tonon.it/public/file/1482259669.pdfIn PDF document text
    • http://www.sictombbi.fr/ckfinder/userfiles/files/sezezot.pdfIn PDF document text
    • http://menifee.hanasushichoice.com/uploads/files/75999717633.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/mg6iu9efkmpvi7vrsth7ipcuk0/jilujor.pdfIn PDF document text
    • http://onfireinteriors.com/userfiles/pafilox.pdfIn PDF document text
    • http://thestarbusan.com/FileData/ckfinder/files/20210903_0BAF3EC7B48DEED9.pdfIn PDF document text
    • https://tdemo.order-pro.com/ckfinder/userfiles/files/tewezeb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=speed+post+nashikPDF 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_off0000b061.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB061 10512 bytes
SHA-256: b338fff1774e469ff50a544a8a0e376add6248208d79c80d27bc3e29088c6b6f
font_01_sfnt_off0000c834.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC834 14732 bytes
SHA-256: c06035d30c364702f848d23b867559de43e580f28a269f03beaa09d8085d4598
font_02_sfnt_off0000ed8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1