Malicious PDF — malware analysis report

Static analysis result for SHA-256 193b2b65538fd884…

MALICIOUS

PDF

77.5 KB Created: 2021-09-16 21:57:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 94d57298546a62aa1b6db5636dfa7f9e SHA-1: 4056d1291926b01a21fe1c82cec38b2bd1a3f574 SHA-256: 193b2b65538fd884083ec2b2fa54613b777527613d5dcee1287ced461aa16bd5
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, many of which point to compromised WordPress upload directories or disposable hosting, indicating a link farm designed to redirect users to malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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 http://pdww.ru/ckfinder/userfiles/files/ridavezowodopa.pdf
    • https://institut-arabe.org/ckfinder/userfiles/files/damutefejojoxezija.pdf
    • https://www.sir.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16142dd6f55a53---96280929749.pdf
    • http://closehorses.com/userfiles/file/xebozotevusi.pdf
    • http://air-con.ru/upload/files/kobamaxawulokomodopiruw.pdf
    • http://www.farmaciapenil.es/userfiles/files/10756310809.pdf
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/22904359f00f6180b3b758fd6de89bc3/88053520755.pdf
    • https://profix.fr/ckfinder/userfiles/files/pelekedix.pdf
    • http://bulmarconsult.com/files/tebosuwelaruterelos.pdf
    • https://xn--1--8kcai1ck2bs.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/64afab1bc50e1d232a734e32c65a57ab/pobefumoda.pdf
    • http://drcleancenter.com/uploads/files/202109070805342085.pdf
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/fojilusipaw.pdf
    • http://shipagents.nl/uploadfiles/file/jasobepodi.pdf
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/tative.pdf
    • https://alstar.uz/images/shared/file/viwakerobuzin.pdf
    • http://zatacorp.com/upload/files/tixurib.pdf
    • http://mmbassisiprovince.in/files/js/ckfinder/userfiles/files/pogejipobuz.pdf
    • http://thenext.pk/userfiles/files/60538322222.pdf
    • http://siltherm.com/ckfinder/userfiles/files/40883769464.pdf
    • http://dichvugiayphep.biz/upload/ck/files/kutilupomafenikinuk.pdf
    • http://thanhcongtechtra.com/upload/files/68051623460.pdf
    • https://gites-les-bardots.com/userfiles/file/xapebibavan.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=adb+connect+unable+to+connect
    • 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_off0000cb93.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCB93 16792 bytes
font_01_sfnt_off0000e3aa.bin
5e0a72e21de386967b95fcf80ec23bd43c8eb8e0d8f26303fed6bd003af7cf03		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE3AA 10224 bytes
font_02_sfnt_off0000fac2.bin
05d61bdc30d81fe9e9ee730ed399bd6e6705d7a1d61bf61b89fedb98aa2364ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 17380 bytes

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