Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec7bd9d905e9a49d…

MALICIOUS

PDF

70.5 KB Created: 2021-09-24 16:52:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94e7f050f49617be93969b5dd57b600e SHA-1: cc95825e0dec0fdf46fa32def7f5ec221cafe48f SHA-256: ec7bd9d905e9a49d56d30d47e7eadd97ecedef76ab3674c57c5ae6e41df4d7c8
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to various domains, many of which are hosted on compromised CMS uploads or appear to be disposable. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

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://tianlanip.com/filespath/files/20210904030916.pdf
    • https://bestcaps99.com/ckfinder/userfiles/files/55633200018.pdf
    • http://peaceinsrilanka.lk/userfiles/file/guxuwizepetezibevu.pdf
    • https://nazragame.com/calisma2/files/uploads/fonujatufixug.pdf
    • https://xrtradingfeedback.com/cmsimages/file/zadarulujoripukisofebekat.pdf
    • http://foto-preiss.at/upload_files/files/40324900661.pdf
    • http://www.pranabkumar.com/fckimages/file/tagoji.pdf
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/161493581481b0---72547543717.pdf
    • http://www.iso-clean.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614bebc5a08be---dirajerefipotum.pdf
    • http://dui-antidote.net/images/userfiles/file/favidezijuxalur.pdf
    • https://www.revistadefiesta.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614880bc76bda---93927633341.pdf
    • http://influences-vegetales.eu/assets/Image/files/22941881599.pdf
    • http://ebiocell.com/uploadfile/file///2021090204492712.pdf
    • http://archi-m.ru/userfiles/file/8365644947.pdf
    • https://dafelia.com/files/kivazetulosovobib.pdf
    • https://www.scanworld.se/wp-content/plugins/formcraft/file-upload/server/content/files/161474dd254c2c---tosezuge.pdf
    • https://petikdaun.com/contents/files/nomudabiw.pdf
    • http://gyogytornasziget.hu/uploads/files/68250620817.pdf
    • http://qianxish.com/ckfind_image/files/wikijetowebagodenuxoriri.pdf
    • https://www.projectorrentals.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614595cba371d---46652053208.pdf
    • https://mtydizayn.com/userfiles/file/tinefixuwanu.pdf
    • https://infotechloyalty.com/bot/ckfinder/uf/files/jaxesedimirax.pdf
    • http://kondicionery-ivanteevka.ru/upload_picture/file/lomezapijawa.pdf
    • https://es88.tw/pro_pic/files/16361793646.pdf
    • http://luyenthidhcanhsat.com/Images_upload/files/vexuvu.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=games+like+rise+of+nations+for+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b19a.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xB19A 16792 bytes
font_01_sfnt_off0000c9ac.bin
3b88a6eb80ab6daa1a4a2272953464c8f579abf7df617d4d91cf6ee6e1440121
pdf-font-stream PDF embedded font (sfnt) at offset 0xC9AC 16336 bytes
font_02_sfnt_off0000f37d.bin
a8b1ea6e65a0520dd2e4ccd4c6a43d045dac8fae56d11c7c1bdf25981e3690c8
pdf-font-stream PDF embedded font (sfnt) at offset 0xF37D 10648 bytes