Malicious PDF — malware analysis report

Static analysis result for SHA-256 f41acbf3ad64eeef…

MALICIOUS

PDF

70.7 KB Created: 2021-09-25 00:27:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 6b1d261eb601383e8d6c3e388ade2229 SHA-1: 8fdcd12b37f11345011d942a320f1f3ffb55c1a3 SHA-256: f41acbf3ad64eeef2c6739c02300eaeac60a907e1a3cdf237527478a84552caa
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript and numerous URLs, many of which point to compromised or disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded JavaScript and link farm structure suggest the document is designed to lure users to external sites, likely for phishing or to download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9837

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://wastran.ru/uplcv?utm_term=watch+the+wolf+of+wall+street+movie+online
    • https://kebecelectrique.com/upload/editor/file/76829199240.pdf
    • http://reklama-kemerovo.ru/files/files/jegivizukakunux.pdf
    • http://www.jobsincrete.gr/images/_user_na/file/97882050901.pdf
    • https://factorysales.com/userfiles/files/71586569218.pdf
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/vesukisupoxolekikuruw.pdf
    • http://dgone.kr/userfiles/file/20210923085257.pdf
    • https://beautifullifeuk.com/wp-content/plugins/super-forms/uploads/php/files/21e215c0b66cd3434192d27741d1ea1c/95800492834.pdf
    • http://szzxwx.com/Upload/Upload/file/2021916927515021.pdf
    • http://aotwresort.info/ckfinder/userfiles/files/39442369853.pdf
    • https://motoquadro.de/userfiles/file/73522015589.pdf
    • https://eyetracking.pl/userfiles/file/82259530374.pdf
    • https://imihwa.com/uploads/image/20210911/files/20210911075243.pdf
    • http://thebankcardservices.com/uploads/files/kadolul.pdf
    • http://n-production.com/upload/fckeditor/file/pipevataguxibibagefot.pdf
    • https://www.koreayokogawa.com/ckfinder/userfiles/files/76106420863.pdf
    • https://hankilfood.com/upfile/files/32134794667.pdf
    • http://stadtbild-intervention.de/Quansis/ckfinder/userfiles/files/borunadabuxivu.pdf
    • http://lightofislamonair.org/uploads/files/zupotowetumibawupozuburox.pdf
    • http://studiotecnicoprato.eu/userfiles/files/befizal.pdf
    • https://wcdt.co.th/wp-content/plugins/super-forms/uploads/php/files/k2t6ckknhsvl99jjpnk9ps516o/10473083582.pdf
    • https://menu2uplus.com/images/file/pekigutewezakixel.pdf
    • https://mamproducciones.es/wp-content/plugins/formcraft/file-upload/server/content/files/1614acecf91853---96559002134.pdf
    • http://nanchang.chinatupai.com/web/js/ckfinder/userfiles/files/zolikejalarapomet.pdf
    • http://copy-office.it/userfiles/file/13832329014.pdf
    • http://slsnn.ru/content/files/samefobovosawo.pdf
    • https://hotelpancharatna.com/assets/userfiles/files/67103302848.pdf
    • http://steinbach.casawell.tw/userfiles/file/72664485615.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_off0000b347.bin
ae562354204a29aa4a1c3aa48a7689cea4e838b77447d0eb018edd412d464e8e
pdf-font-stream PDF embedded font (sfnt) at offset 0xB347 16292 bytes
font_01_sfnt_off0000dc2c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
pdf-font-stream PDF embedded font (sfnt) at offset 0xDC2C 16792 bytes
font_02_sfnt_off0000f443.bin
022e2d2e1490c9add360c9ecb017e27f03804724a41cafdf45579bf4757afeb5
pdf-font-stream PDF embedded font (sfnt) at offset 0xF443 10748 bytes