Malicious PDF — malware analysis report

Static analysis result for SHA-256 e77e54ad023a8e87…

MALICIOUS

PDF

81.9 KB Created: 2021-09-24 05:14:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 293b89fe42250a9fb9666c8b54eae681 SHA-1: ad758cd0f4324d8da8bb140f5727865e2a5fd230 SHA-256: e77e54ad023a8e87082c73ef3eac42bfdb5cc7795cdfee899aad9dec1a7466ab
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external links, many hosted on compromised CMS platforms or disposable domains. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 7

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://allytemp.ru/uplcv?utm_term=poko+apk+download
    • http://servmed.net/userfiles/file/boxedinajevewowopo.pdf
    • https://themodernla.com/wp-content/plugins/super-forms/uploads/php/files/9806f7b0ab9b033674d6f4edd0ccca87/zemabinapojopitup.pdf
    • http://etre-belle.su/images/file/godow.pdf
    • http://nwatchonline.com/userfiles/file/watenafesowano.pdf
    • http://philipsphotographystudio.com/zoxotiri.pdf
    • http://myphamlulanjina.com/upload/files/49233374679.pdf
    • http://ampletrekking.com/userfiles/file/wuvonun.pdf
    • http://naphotelbangkok.com/userfiles/files/kuraparujemuvokarivori.pdf
    • https://nhaban24h.com.vn/wp-content/plugins/super-forms/uploads/php/files/gneo3582rp4elt04vh5e5d6en1/39489121139.pdf
    • http://pitin-akutsu.com/js/upload/files/zarakalajawuxugijuwodu.pdf
    • http://interstroy96.ru/uploads/files/wipotuzux.pdf
    • http://dichvu12h.net/userfiles/file/3094150075.pdf
    • http://jatechkj.pl/upload/fck/file/91146315791.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/rodixuvukabamuxo.pdf
    • https://njsolarpower.com/wp-content/plugins/super-forms/uploads/php/files/fa0b83e447931e017e7a25d9b0d9cf8e/72944309802.pdf
    • http://goref.ru/files/file/66869136280.pdf
    • http://sbstroy53.ru/img/files/79383202049.pdf
    • http://holzbau-napetschnig.at/59339307928.pdf
    • https://klcconsulting.eu/klc/file/38131122638.pdf
    • https://giridhareye.org/ckfinder/userfiles/files/37722056920.pdf
    • https://xyoaa.org/sites/default/files/files/nezat.pdf
    • http://codemessaging.net/ckfinder/userfiles/files/xetonolemuribusinef.pdf
    • http://zdrowejaja.com/Upload/file/wewifiko.pdf
    • http://intertermo.nl/userfiles/file/zobixonipuwuzafazipezodo.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_off0000dd19.bin
6396cbcf1fdff3ddc4ae27e9a7ce8e7fb824e2a8d6dd73a509120ca0041764c5
pdf-font-stream PDF embedded font (sfnt) at offset 0xDD19 18044 bytes
font_01_sfnt_off00010b7b.bin
d117e1ed24216b3cf426d557e1767f869578e6af951ff7dae21cadddfbd3e40f
pdf-font-stream PDF embedded font (sfnt) at offset 0x10B7B 9972 bytes
font_02_sfnt_off000121b6.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0x121B6 16792 bytes