Malicious PDF — malware analysis report

Static analysis result for SHA-256 171f1ebb851fea7c…

MALICIOUS

PDF

70.9 KB Created: 2021-09-29 01:05:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: cf26e2724a4cab684625df9279db8d0c SHA-1: 2cd60c9bddbdfc0155b5e012a3d09d8979f82d10 SHA-256: 171f1ebb851fea7c8ed2bfc9ea4b3a46b88c7d2858c1495cedadca6e4ea74cdd
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is identified as a link farm pointing to compromised CMS uploads and disposable hosting. The embedded JavaScript stream suggests potential for malicious actions, such as downloading further payloads or redirecting users to phishing sites. ClamAV detection and ML classification strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=bbc+hausa+radio+apk
    • http://ets-sptk.ru/pic/file/37912642879.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363d0e290f2---mizadibofo.pdf
    • http://cmuniontravel.com/userfiles/file/71750074266.pdf
    • https://cpsguffanti.it/uploads/file/bilifogobo.pdf
    • https://rawoctane.com/uploads/file/xevepek.pdf
    • http://bebelino.ru/userfiles/file/vurerinefivabevovixumodaf.pdf
    • https://theemperorsoldclothes.co.uk/wp-content/plugins/super-forms/uploads/php/files/j8bctq4nto0i51h8n1scquahu0/dipigupetizibudi.pdf
    • http://www.huntsvillepr.com/files/files/66391310501.pdf
    • https://natatourism.com/userfiles/files/suduvenulapade.pdf
    • http://srtprogetti.eu/userfiles/files/businiwitoke.pdf
    • http://shsuorui.com/uploadfiles/fckeditor/20210922/file/16323127975582.pdf
    • https://losungversorger.com/product/file/mawanova.pdf
    • https://huuphongplastic.vn/uploads/images/files/pokabixejufubip.pdf
    • http://esangsok.com/upfile/files/lururalilifad.pdf
    • https://tw-itemaos.com/ckfinder/userfiles/files/44979216826.pdf
    • https://km2804.com/ckupload/files/dikegogoxezutamibizewobo.pdf
    • http://milcontabil.com.br/wp-content/plugins/super-forms/uploads/php/files/q38iogchj5e6o8crt3dmls5kl1/49029545715.pdf
    • http://iscelenie.info/files/file/16509508683.pdf
    • http://hnfhdc.com/UpLoadFile/2021092315080397747.pdf
    • https://nutritie-metabolism-sanatate.ro/app/webroot/files/userfiles/files/40358964614.pdf
    • http://haliburtonhighlandsheritage.ca/userfiles/file/44724418976.pdf
    • https://elicopter-de-inchiriat.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613e01318a89c---36331278303.pdf
    • http://24x7taazasamachar.com/assets/ckfinder/core/connector/php/uploads/files/ximakoxujavinebuku.pdf
    • https://imahima.xyz/js/ckfinder/userfiles/files/99922003562.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_off0000b319.bin
485812f73b74ffd6adf8beb4fb2904d434eab33ec31f5c82dd07bfb63a32c3c0
pdf-font-stream PDF embedded font (sfnt) at offset 0xB319 10616 bytes
font_01_sfnt_off0000cb4e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xCB4E 16792 bytes
font_02_sfnt_off0000e360.bin
7e0177ca5eacd1f8b8acd9f06ee1e8c8334def03e1fba83c762dae53ff91cc22
pdf-font-stream PDF embedded font (sfnt) at offset 0xE360 16528 bytes