Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b993034cbfe682d…

MALICIOUS

PDF

91.7 KB Created: 2021-09-18 19:48:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: d64cce0e9e5a4f1f280f7233759f5b14 SHA-1: 1a7ba92e343ffcdfa17eda004ad4136a025adc0e SHA-256: 2b993034cbfe682d570f9f794d9fe298850b19729483ebe4c163bd9f3912efac
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by ML classifiers and ClamAV as malicious. It functions as a link farm, containing numerous URLs pointing to various websites, some of which are hosted on compromised CMS uploads or disposable domains. The presence of these links suggests an intent to redirect users to malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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 http://vhshf.de/File/11820120481.pdf In PDF document text
    • http://csc0351.com/userfiles/file/20210908231704_rh2gdb.pdfIn PDF document text
    • https://diversifiedhumansolutions.com/wp-content/plugins/super-forms/uploads/php/files/d650d9d92106027975b78c25fda8b5f8/23968502459.pdfIn PDF document text
    • http://www.ocptecnology.com/admin/uploaded/fck/file/29173393753.pdfIn PDF document text
    • http://dreambeauty.kr/upload/fckeditor/file/57547741671.pdfIn PDF document text
    • http://hosungtour.com/FileData/ckfinder/files/20210905_F44813685278A13F.pdfIn PDF document text
    • https://ibericadearmerias.com/file/57387605828.pdfIn PDF document text
    • https://autoradiator.mn/uploads/ckfinder/files/59276231498.pdfIn PDF document text
    • http://medigroupvn.com/upload/files/91269069515.pdfIn PDF document text
    • http://letnipohar.cz/upload/file/7751603209.pdfIn PDF document text
    • http://karlsbach.de/userfiles/files/nexolina.pdfIn PDF document text
    • https://arhstroi.by/uploads/files/48391222011.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/64181000191.pdfIn PDF document text
    • http://futurepoolandspa.com/ckfinder/userfiles/files/76012416475.pdfIn PDF document text
    • https://shirbandifelt.com/userfiles/file/rezirukojenodotarupurake.pdfIn PDF document text
    • http://revucue.com/ckfinder/userfiles/files/52652832202.pdfIn PDF document text
    • http://beckydavidsonhomes.com/wp-content/plugins/formcraft/file-upload/server/content/files/161348418db5e4---fukuronakujenatokabo.pdfIn PDF document text
    • https://x-leather.com/radsportfiles/file/mavopebugawapolozixawub.pdfIn PDF document text
    • http://www.humillacionyestrella.org/ckfinder/userfiles/files/xunirufupezi.pdfIn PDF document text
    • http://chafewyuok.handysociality.com/upload/files/91839114206.pdfIn PDF document text
    • http://movesearchesuk.com/userfiles/file/61719517195.pdfIn PDF document text
    • http://www.elsecretodelolivo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e94ace74b7---94961085092.pdfIn PDF document text
    • http://dryoucosmeceutical.com/userfiles/files/71139339948.pdfIn PDF document text
    • http://aygroupmuh.com/image/files/wogabasagubupowofisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/3CAf4wW3hvY/uplcv?utm_term=custom+rom+mi+10t+proPDF 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_off00010415.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10415 10272 bytes
SHA-256: 9ca9b3af6a0308ef3208fd4f59b8ad77f19da3ad16b9a3e804a95d8c62998989
font_01_sfnt_off00011b3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B3E 17528 bytes
SHA-256: d55f614a9a9acc7802e14873c1f131df0147afe05b5a7a239cec36a848aa7b32
font_02_sfnt_off000148ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x148EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1