Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b338be5383fa826…

MALICIOUS

PDF

80.9 KB Created: 2021-09-23 09:07:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 29f7daea9d0d5fdbb9d7f63bdef895d3 SHA-1: 71542da6c7deabb50a739aa405f493d644fa9ceb SHA-256: 8b338be5383fa826a4ae2996932b6a3a880f9e7ce28f5afdc73eff9a7a3e9e11
156 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on compromised or disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly suggests malicious intent. The primary attack pattern involves luring users to these external sites, which likely host phishing content or further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://medvor.ru/uplcv?utm_term=android+11+fm+radio PDF link annotation
    • http://fazendasaojudastadeu.net/fotosempresa/files/xamagifezipuxadaku.pdfIn PDF document text
    • http://eluvial.com/sites/all/sites/eluvial.com/files/xurinevifizexizibenevedoz.pdfIn PDF document text
    • https://ruxthai-guesthouse-chiangmai.com/ckfinder/userfiles/files/japana.pdfIn PDF document text
    • https://b2cexpressdemo.com/userfiles/file/44504994995.pdfIn PDF document text
    • https://eledigitalpr.it/allegati/file/gigepadolixivupil.pdfIn PDF document text
    • https://fjhi.org/userfiles/file/josinunuwefanizixe.pdfIn PDF document text
    • https://almavilag.hu/files/files/pewijimibikinutinaj.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/29119834387.pdfIn PDF document text
    • https://www.privathospitaletkollund.com/ckfinder/userfiles/files/59280231821.pdfIn PDF document text
    • http://alptw.com/images/files/77821158717.pdfIn PDF document text
    • https://karatenarrewarren.com.au/ckfinder/userfiles/files/wovuxagava.pdfIn PDF document text
    • http://beetsom.com/PROGRAM_FCKeditor_UserFiles/file/6130834726132d470e5856.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/41432120964.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/33032311422.pdfIn PDF document text
    • http://www.vako.vn/app/webroot/uploads/files/rasababolitirerezub.pdfIn PDF document text
    • https://posaonakosovu.com/ckfinder/userfiles/files/pegofonuwapegibalezo.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399505378ab---zejetimub.pdfIn PDF document text
    • http://skisun.it/userfiles/files/zelelarutuwo.pdfIn PDF document text
    • https://rainbowprinter.com/app/webroot/files/file/segudatuxa.pdfIn PDF document text
    • https://www.tahitotfalu.hu/ckfinder/userfiles/files/21863872930.pdfIn PDF document text
    • http://discarga.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614bba7c3c90a---davomabuludulokegikudote.pdfIn PDF document text
    • http://cochemical.com/upload/files/97757561617.pdfIn PDF document text
    • https://pluckywize.com/wp-content/plugins/formcraft/file-upload/server/content/files/16148440c58a40---riziwos.pdfIn PDF document text
    • http://btfa.tw/upload/files/79622232407.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/2217816953.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_off0000d968.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD968 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f17a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17A 17716 bytes
SHA-256: f1571c4fb84c5b22e1a5be05b3a998d74a89dbb8bac11e5e7eb8d3440863999c
font_02_sfnt_off00011f6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F6E 10104 bytes
SHA-256: 3766733b65573ece2279d24dbbd3275488ccf7c3c65b8889549777f5b9061512

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