Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bde0bfbc2f1fbe4…

MALICIOUS

PDF

72.5 KB Created: 2021-09-16 11:09:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 953e5facb271e6dd2bc825bfdf5305ed SHA-1: bdd7328e4275e71adb91fc4102b25d675eebeb96 SHA-256: 4bde0bfbc2f1fbe4fc27ba27b1fc243daffdbbc05e526f3db06ec4c2478d77e2
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous links pointing to external PDFs hosted on disposable domains, indicative of a link farm designed to distribute malicious content. The presence of ClamAV detection and ML flagging strongly suggests malicious intent, likely phishing or malware delivery. The heuristic 'SE_CALLBACK_LURE' further supports a phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://kaizenlife.com/ckfinder/userfiles/files/tewakivuvojujemigig.pdf In PDF document text
    • http://polenes.cl/userfiles/file/61579298502.pdfIn PDF document text
    • http://lachina.cn/upload/file/ganonaxemobesim.pdfIn PDF document text
    • http://pusancard.com/userData/board/file/1201607262.pdfIn PDF document text
    • http://yds-wcv.jp/free_images/files/rutiju.pdfIn PDF document text
    • http://udelimpa.es/ckfinder/userfiles/files/zafafibo.pdfIn PDF document text
    • http://classiccar-jp.com/js/upload/files/43638582764.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/17174854285.pdfIn PDF document text
    • http://www.bargiel.com.pl/ckfinder/userfiles/files/gojimigusufiwivure.pdfIn PDF document text
    • https://esz.jp/img/editor/files/88667491619.pdfIn PDF document text
    • http://conflictfreeelectronics.com/ourprojects/chowki/UserFiles/renuka/file/44315009606.pdfIn PDF document text
    • https://sapporopools.com/contents/files/54196748143.pdfIn PDF document text
    • https://dolaodong.com/userfiles/file/batow.pdfIn PDF document text
    • http://aquamedia.cn/ckfinder/userfiles/files/jufomadiputar.pdfIn PDF document text
    • https://0900107678.com/upload/file/zodemu.pdfIn PDF document text
    • http://ipceurope.com/assets/file/fawemune.pdfIn PDF document text
    • https://sandipkumardutta.com/ckfinder/userfiles/files/jegajigumebulasufes.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fc46095ce5---88048657017.pdfIn PDF document text
    • https://www.eecpowerindia.com/codelibrary/ckeditor/ckfinder/userfiles/files/tuxubepisimiditevipom.pdfIn PDF document text
    • https://s-h.cc/uploads/files/202109100054036092.pdfIn PDF document text
    • http://immodraft.nrw/images/architekten_agentur_images_/file/48368223389.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/1843802376.pdfIn PDF document text
    • https://pfgmm.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613fbfb3f2ca0---54903049824.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/jesorarinosaretu.pdfIn PDF document text
    • http://www.hkqi.com/wp-content/plugins/formcraft/file-upload/server/content/files/161366133b351f---pomomedazisije.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=emulador+sega+dreamcast+androidPDF 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_off0000b9d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9D1 16176 bytes
SHA-256: a0e7dd4b24fa0d28952f8572b798a5d2c42455e9dafc082ba8130df9aae6e192
font_01_sfnt_off0000e368.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE368 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB7F 10796 bytes
SHA-256: 6bb50d6a7f211b37cd397c8bb7a34bcd712396075b484f1bb4ea2f7f7908807e