Malicious PDF — malware analysis report

Static analysis result for SHA-256 5722a94177d059d2…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 13:56:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: dd7f39f6704ea89540f06707a8f5cbf5 SHA-1: 2f5f4451a476d87397464403c9243834bc114f0b SHA-256: 5722a94177d059d2766d48feebd9d9421c6e4dac17478e8c9e6ab6e84ffaf8b5
156 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to compromised WordPress sites or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the extensive use of external links is the primary attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://nomylo.ru/uplcv?utm_term=how+to+unlock+pin+lock+on+android+without+losing+data
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/161317c4b20095---95128570642.pdf
    • https://www.supremecaravans.com.au/application/third_party/ckfinder/userfiles/files/nuwanewunuwixadusipipe.pdf
    • https://darkoyunpin.com/calisma2/files/uploads/karomagadotife.pdf
    • http://smeeing.com/userfiles/files/14776809327.pdf
    • http://9262895.ru/ckfinder/userfiles/files/18330414998.pdf
    • https://shibbirs.com/media/files/66028903924.pdf
    • http://pizzeriagiganti.ro/imagini_ws/nozuxujip.pdf
    • https://briljant-maleri.se/UserFiles/files/kuzuburezugalas.pdf
    • https://pomacanthe-art.fr/imagebeforeafter/files/35388907080.pdf
    • https://helicopterleasingservices.com/userfiles/files/36475094573.pdf
    • https://cafemocion.com/userfiles/file/34659427366.pdf
    • https://nailseasupportgroup.com/wp-content/plugins/super-forms/uploads/php/files/d55c6846e4b44aaf4ef4ae6d9f9c5e00/rokifivufuvotajake.pdf
    • http://haithuanphat.com/uploads/files/nipojekubelofarokujob.pdf
    • http://montagnobozzone.it/userfiles/files/fizegedorunox.pdf
    • https://festivaldelmaridaje.com/sgi_userfiles/userfiles/files/tikakorarapewopodagal.pdf
    • http://opusincertum.it/userfiles/files/pelagazerilamoveveza.pdf
    • http://stacjaregeneracja.pl/userfiles/file/bizixudovar.pdf
    • http://www.kliningstroy.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613ccd84ae3a0---zulufo.pdf
    • https://jpjplumbingandheating.com/FCKeditor/file/sojewarulevojunakubuwu.pdf
    • http://www.nbc.com.vn/ckfinder/userfiles/files/lesosadalupapuribizalezot.pdf
    • https://paysecure.ro/ckfinder/userfiles/files/wagonulokab.pdf
    • http://mariautonoleggiomarsala.it/userfiles/files/gugokibuzapigu.pdf
    • http://old.arcnet.org.tw/ckfinder/userfiles/files/22611197532.pdf
    • https://baust.edu.bd/app/webroot/ckfinder/userfiles/files/bajanumazeje.pdf
    • https://landtop.com/filespath/files/20210901114547.pdf
    • 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_off0000dec4.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC4 16792 bytes
font_01_sfnt_off0000f6d6.bin
8f503c100d305b203ff08bd2129364353a3014bb51f0ee3f480904ace13780a6
pdf-font-stream PDF embedded font (sfnt) at offset 0xF6D6 20900 bytes
font_02_sfnt_off00012d39.bin
6950306605f0e31c027f42f971bafa5705b1194b60667fab231cba61ee32d437
pdf-font-stream PDF embedded font (sfnt) at offset 0x12D39 10928 bytes