Malicious PDF — malware analysis report

Static analysis result for SHA-256 9dba0554745ef848…

MALICIOUS

PDF

71.5 KB Created: 2021-09-25 07:30:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 016f01ee5edabe59c306dd6ec71aef12 SHA-1: 8b545fbebf0929d023ce810253d0785510984f34 SHA-256: 9dba0554745ef848f90028b3c32a6c8ba0c35f5af266c829aa4e48d0896028f8
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external links, many pointing to disposable hosting or compromised upload directories, suggesting a link farm for phishing or malware distribution. The presence of a GTA 5 cheat engine lure in one URL indicates a social engineering attempt to entice users to click malicious links. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 8

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://jamisonfurnace.ca/userfiles/files/19344110834.pdf In PDF document text
    • https://bestcaps99.com/ckfinder/userfiles/files/37614982628.pdfIn PDF document text
    • http://greatwalledmond.com/ckfinder/userfiles/files/wuxiwalifejezis.pdfIn PDF document text
    • https://singhaniabrothersltd.com/ckeditor/ckfinder/userfiles/files/wezemubaxojufelil.pdfIn PDF document text
    • http://tuzoltosagmihald.hu/userfiles/file/xalimemepazimuto.pdfIn PDF document text
    • http://theeultimatenetworker.com/ckfinder/userfiles/files/pogogizawojokanipuken.pdfIn PDF document text
    • http://juncheng.tw/upload/files/famivomibufad.pdfIn PDF document text
    • https://jagamimpi.org/contents/files/39336583728.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/gotikaw.pdfIn PDF document text
    • http://www.playerclub.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16145815d7585d---kezisumazudofurutedajusi.pdfIn PDF document text
    • https://veritiesinstitute.com/wp-content/plugins/super-forms/uploads/php/files/bd830acd747347fa615bf61dddcdad37/66796821952.pdfIn PDF document text
    • http://smepil.com/ckeditor/userfiles/files/xuzopurowanasamotewa.pdfIn PDF document text
    • http://master-sign.ru/ckfinder/userfiles/files/55434111087.pdfIn PDF document text
    • http://15441707.com/data/board/file/20210908162031.pdfIn PDF document text
    • http://cosmikkino.ru/sadm_files/13795165458.pdfIn PDF document text
    • http://www.aunay-sous-auneau.fr/ckfinder/userfiles/files/bewesagodakudumurawob.pdfIn PDF document text
    • http://siltukai.lt/userfiles/file/sobazonakoxipavap.pdfIn PDF document text
    • http://wanyuantemple.tw/userfiles/file/zujoromakizonulozer.pdfIn PDF document text
    • https://ferropula.hr/files/31991290994.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/mokegeduz.pdfIn PDF document text
    • https://unique.global/wp-content/plugins/super-forms/uploads/php/files/fd208e59136eee43a054eaac585a08f9/dagezuge.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/pusofanegelu.pdfIn PDF document text
    • https://indiachristian.org/uploads/files/29991580565.pdfIn PDF document text
    • http://garage-ys.info/js/upload/files/87050378549.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=gta+5+cheat+engine+moneyPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b436.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB436 10648 bytes
SHA-256: 5426a9115fc59bec254d8dc279d6f1985553b1c8ec383561aa63fdd19ee90b71
font_01_sfnt_off0000cc88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC88 17276 bytes
SHA-256: 8478606b77b016963eb8970d61e4b41ebc6f90fd5fc844b92de2acaea1cfb928
font_02_sfnt_off0000f88c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF88C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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