Malicious PDF — malware analysis report

Static analysis result for SHA-256 c10dd8588bf28508…

MALICIOUS

PDF

68.1 KB Created: 2021-09-29 11:08:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51817f6b76be3ec8ccc4b4b3ad2f2dbd SHA-1: c869bd1c6a4b48b43b644538a21fe4015039085e SHA-256: c10dd8588bf28508ee630112d3793abd2f84b5e2f089ee3b1e2bcdd931c41d92
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous links to external websites, many of which are hosted on compromised CMS uploads or disposable domains, suggesting a phishing or malware distribution scheme. The presence of external URIs and link farms points towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://garglob.ru/uplcv?utm_term=hd+streamz+latest+version+download PDF link annotation
    • https://dukupahit.com/contents/files/18605112339.pdfIn PDF document text
    • http://terremeraude.com/userfiles/file/62009663483.pdfIn PDF document text
    • https://butterfly-propertymanagement.com/userfiles/file/xabarufesemuwavaniw.pdfIn PDF document text
    • http://zekejozsef.eu/FCKfeltoltott/file/wifokeranetube.pdfIn PDF document text
    • https://khachsan295doson.vn/namthuan/images/news/files/gowugenutonumivudimade.pdfIn PDF document text
    • https://gaseg.com/wp-content/plugins/super-forms/uploads/php/files/1saisp4t3ljcvm71m0cf54a9bp/76966287522.pdfIn PDF document text
    • http://nomayaku.com/userfiles/file/jijejilabolasapenowaj.pdfIn PDF document text
    • http://vp-dmsh.ru/admin/ckfinder/userfiles/files/vuzide.pdfIn PDF document text
    • https://lhorizon.ca/uploadHorizon/file/sirunojo.pdfIn PDF document text
    • https://hotararicedo.ro/files/files/sudulagokuvumugum.pdfIn PDF document text
    • https://balbok.net/admin/ckfinder/userfiles/files/51295049976.pdfIn PDF document text
    • https://primer-spb.ru/files/files/1037890918.pdfIn PDF document text
    • http://studiocinti.eu/userfiles/files/xigolazakox.pdfIn PDF document text
    • http://serdceprirody.ru/userfiles/file/ruvaj.pdfIn PDF document text
    • https://mamotato.ro/userfiles/file/lemubimufepakuputuwejowut.pdfIn PDF document text
    • https://ristovski.mk/public_html/upload/userfiles/file/95895855984.pdfIn PDF document text
    • https://biocoop.legreniervert.fr/ckfinder/userfiles/files/91690413391.pdfIn PDF document text
    • http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/qsai3ae6ct21mruhegpiv66am1/wovotavokigege.pdfIn PDF document text
    • http://rotang.net/userfiles/file/japekazefipiduwarati.pdfIn PDF document text
    • http://mamaskitchenorder.com/uploads/files/77116333114.pdfIn PDF document text
    • https://livre-art.com/ckfinder/userfiles/files/tefigedupoku.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/0da735c2661487c85c49bca9a8389b83/92809224687.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_off0000ad19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD19 14852 bytes
SHA-256: f71cc2ac947b8e7c33dd7c7e448ab19bab77e1883ac6e51819693b33d2c34f43
font_01_sfnt_off0000d293.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD293 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eaaa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAAA 10612 bytes
SHA-256: 712748062bec9a139588f7e55180f3365318c01b523d8e2c95c1c0d93a84236e