Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ae9d39b021c8c04…

MALICIOUS

PDF

80.8 KB Created: 2021-09-23 15:16:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 39d55f53ac4818bb7525f778a396461b SHA-1: 7c9500ed911547138f9abbb263ce754605d88f7d SHA-256: 7ae9d39b021c8c044e52d77c3b63ee054a4e213a95b1fe83b4d9788341152261
156 Risk Score

Malware Insights

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

The file is a PDF that contains a large number of embedded URLs, many of which point to compromised WordPress sites or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and link farm characteristics suggests an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 6

  • 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.
  • 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://wastran.ru/uplcv?utm_term=how+to+synch+email+on+android+phone PDF link annotation
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16146c642db028---5591235137.pdfIn PDF document text
    • https://organicearthfiji.com/documents/file/53742582240.pdfIn PDF document text
    • http://mobitransjogja.com/files/dawakutikexigizor.pdfIn PDF document text
    • https://vendax.ro/files/file/fiturixalutasitisegaz.pdfIn PDF document text
    • http://opuspoint.com/ckfinder/userfiles/files/64265434037.pdfIn PDF document text
    • http://laconchigliacasevacanze.it/userfiles/files/migadirativumi.pdfIn PDF document text
    • http://valeneighbors.com/userimages/kofesusegutuwemoduxal.pdfIn PDF document text
    • https://rapn.ru/ckfinder/userfiles/files/ramakijudaxoviziguwid.pdfIn PDF document text
    • http://xn----1-6cdapb2bdyqawnpcindqfc.xn--p1ai/media/file/66498645908.pdfIn PDF document text
    • http://446888.top/userfiles/file/nabamowivefo.pdfIn PDF document text
    • https://iqmuseum.mn/uploads/files/31953934477.pdfIn PDF document text
    • http://droprint.my/home/ququ4923/public_html/userfiles/file/tofimeju.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/xetizisegenogupitozeveve.pdfIn PDF document text
    • http://hz-kontejnery.cz/ckfinder/userfiles/files/22949118359.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614489c94d9ef---nilasijomapar.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/60689518301.pdfIn PDF document text
    • http://kmjmt.com/news/upload/file/210916221025501180iwwt9t.pdfIn PDF document text
    • http://nhuaduongnhapkhauaz.info/upload/files/vovumulubezode.pdfIn PDF document text
    • http://peknanevesta.sk/media/file/16557618978.pdfIn PDF document text
    • http://svs-pm.com/wp-content/plugins/formcraft/file-upload/server/content/files/161395bac7fa9e---83004482812.pdfIn PDF document text
    • http://zbraneklapka.cz/ckfinder/userfiles/files/67308921042.pdfIn PDF document text
    • http://nano-vip.com/ckfinder/userfiles/files/56482396223.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_off0000d761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD761 17484 bytes
SHA-256: 867990e8472f2993d7ddb6f8d0489137d2f24eab107b154b729cbd6735b9546d
font_01_sfnt_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10968 bytes
SHA-256: d28625040b9fadc0eb6aeed64172c45aa65510f0fc5fea4a0cbd817aad71be19
font_02_sfnt_off00011d5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1