Malicious PDF — malware analysis report

Static analysis result for SHA-256 ab7eeeb9cb646fd9…

MALICIOUS

PDF

84.3 KB Created: 2021-09-23 08:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ac6c36e4cba5f66c929406b6dc247708 SHA-1: 0b048fe06c05a68b8f54bf3e311981a6340b9589 SHA-256: ab7eeeb9cb646fd9af653829433282d64bfa404a9ad83f7879d3bdaafe5979ce
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous links to external websites, many of which appear to be hosted on compromised WordPress sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. The embedded URLs, such as 'https://crewmak.ru/uplcv?utm_term=nepali+keyboard+apk', suggest a lure to download potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9938

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://crewmak.ru/uplcv?utm_term=nepali+keyboard+apk
    • https://alfa-clining.ru/wp-content/plugins/super-forms/uploads/php/files/0319f4ad2c7eaf31c4794b71a61549d2/51395005857.pdf
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/421a9acde8406833cb9071f25ea8f7a1/wanipijeronu.pdf
    • http://baozhaopharma.com/upload/files/wofanawuxapenimuwo.pdf
    • https://tapuionoticias.com/ckfinder/files/20986544729.pdf
    • https://fjordancv.info/wp-content/plugins/super-forms/uploads/php/files/baf2121e027ea773e1e7017e13c7e0e8/8413769830.pdf
    • http://gojjang.com/uploads/files/wefij.pdf
    • https://kiemtoandongnghi.com/public/plugins/ckfinder/userfiles/files/10322262963.pdf
    • https://jecoexports.com/ckfinder/userfiles/files/97102980468.pdf
    • https://anctools.com/ckfinder/userfiles/files/bevavoxigaki.pdf
    • http://fjzy18.com/image/uload/files/66630654582.pdf
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/796112517.pdf
    • https://groupunsur1.com/contents/files/pefufojegib.pdf
    • http://kite-surf.sk/files/60429260239.pdf
    • http://qiangka.com/ckfinder/userfiles/files/mebulala.pdf
    • http://htwy.com/upload/file/semoruwotafebato.pdf
    • https://varbackaforskola.se/ckfinder/userfiles/files/fekadusagajazafofudijoro.pdf
    • http://albachiara.info/userfiles/files/fapoxusazidokonudexeba.pdf
    • http://worksafeorg.com/wp-content/plugins/super-forms/uploads/php/files/bfitmp0j45cn71df55igeuln10/zibivofomubumuwofe.pdf
    • http://visit-pune.com/userfiles/file/63317718185.pdf
    • http://berallebags.com/UploadFiles/FCKeditor/20210905224235.pdf
    • http://globalsocialwlefaresummit.com/app/webroot/uploads/ckuploads/files/litarikekowerito.pdf
    • http://amidoux-peintures.com/ckfinder/userfiles/files/vixuge.pdf
    • https://shirbandifelt.com/userfiles/file/sixifasipisevigabaxopupiz.pdf
    • https://gtijsr.com/userfiles/file/jufumolil.pdf
    • https://harteron.ee/userfiles/file/91159821477.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d216.bin
6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
pdf-font-stream PDF embedded font (sfnt) at offset 0xD216 1680 bytes
font_01_sfnt_off0000da13.bin
e7858e36f64437cc67256a1d76cb94291d335f20c78599ca671bcafc39bfbc08
pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 10340 bytes
font_02_sfnt_off0000f13f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xF13F 16792 bytes
font_03_sfnt_off00010951.bin
83a0af5a52414629f08eca789c1d0d05ef2af4d42b9f2b614ed53c763244353c
pdf-font-stream PDF embedded font (sfnt) at offset 0x10951 22120 bytes