Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd1158edeb90f7c1…

MALICIOUS

PDF

83.3 KB Created: 2021-09-10 06:47:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3c5ac19e99deec84010c90e7cecc3a6f SHA-1: 451a8f89aa7b4c438402708cefeb4d64bd23985a SHA-256: cd1158edeb90f7c16a28285210869697d68dcc2827747c79456a4fde58974eec
164 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also features numerous external links, many pointing to compromised WordPress upload directories or disposable hosting, suggesting a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://zwickerfoto.hu/_user/file/zobopurin.pdf In PDF document text
    • http://swaptoys.org/ckeditor/uploads/files/kodivaluv.pdfIn PDF document text
    • http://xn--42-6kcdlkbomh7beggito5p.xn--p1ai/userfiles/file/3491701905.pdfIn PDF document text
    • http://www.la-rocca.pl/app/webroot/files/files/jivowunozuziwuvu.pdfIn PDF document text
    • https://hotnewsmd.deca.md/upload/userfiles/files/99925371183.pdfIn PDF document text
    • https://festacontinua.it/public/file/17417980692.pdfIn PDF document text
    • https://uleshuzataruhaz.hu/files/file/26588019456.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/xajovivosugiwunim.pdfIn PDF document text
    • http://stillincontact.com/images/mails/file/voruvofo.pdfIn PDF document text
    • http://www.nachtruhe.info/up/files/tekeluzixidara.pdfIn PDF document text
    • https://vroa.pl/chplusfiles/file/84221166126.pdfIn PDF document text
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16138de5c0ceb0---33132409673.pdfIn PDF document text
    • https://smoothnomad.com/wp-content/plugins/super-forms/uploads/php/files/neq64oqsljufs9u1e5i0sq4cps/21023432377.pdfIn PDF document text
    • https://vishalahospitality.com/ckfinder/userfiles/files/17123271766.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/riwonokibomafojelezu.pdfIn PDF document text
    • https://perleyparish.org/wp-content/plugins/super-forms/uploads/php/files/9637e4e72129a6252bf674fa2cb36e93/68342091393.pdfIn PDF document text
    • https://jaunimodienos.lt/wp-content/plugins/super-forms/uploads/php/files/43repup10q716pv4o0kn6tq0hn/sopobamerimoduje.pdfIn PDF document text
    • https://nenmongdangquang.com/upload/files/lifabogesatok.pdfIn PDF document text
    • https://linker.tw/files/73610511894.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/46990500661.pdfIn PDF document text
    • http://aescantabria.es/upload/fckeditor/file///72168205968.pdfIn PDF document text
    • http://hzqljsj.com/images/upload/File/weterubajojurubolegixu.pdfIn PDF document text
    • http://xedaptap.net/userfiles/file/43522884704.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=movie+sites+to+download+fromPDF 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_off0000e12a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE12A 17740 bytes
SHA-256: 1a8b3e6da6de622b96cba8e12cb4427759a7282de2c2d53986ac5b3203d612fa
font_01_sfnt_off00010ef7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EF7 10660 bytes
SHA-256: 583841c8d2a5f8e116bf7232193c34dffc00545941474b80817e277abed99a44
font_02_sfnt_off00012778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12778 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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