Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e0e3405575a948…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 18:18:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 4275f3391a9be5548a0df52650606e8b SHA-1: e2f8488de0aac7489491e5680bd30270af67a714 SHA-256: 31e0e3405575a9487fee6f50735c4d2e1b35622744391c497bcecc4c300406c1
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm, with several URLs pointing to compromised CMS upload storage. The ML classifier and ClamAV also identified it as malicious, specifically as a phishing trojan. The document's structure and embedded URLs suggest an attempt to redirect users to potentially harmful content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • 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.
  • 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://advicezone.org.uk/wp-content/plugins/super-forms/uploads/php/files/tk3do70qm4h0pcq3fdc7ftrhdf/pijijeje.pdf
    • http://phanmemerp.vn/attachment/files/kukediwokavefinapolisa.pdf
    • http://nieruchomosci-swidnica.pl/userfiles/file/tuzamej.pdf
    • http://zeminyerkaplama.com/upload/ckfinder/files/kudubenunugovulob.pdf
    • http://self119.net/upload/userfiles/2021/09/files/210901232958.pdf
    • http://ihdbd.org/upload/files/54067199093.pdf
    • https://hiddencliff.kr/FileData/ckfinder/files/20210902_3C9A7670C757FF73.pdf
    • http://theexplorerthai.com/userfiles/files/powavaragenasutezupoxali.pdf
    • http://summitremodelinginc.com/userfiles/files/silikexogapujox.pdf
    • http://tuzvedo.hu/elemek/file/32837340663.pdf
    • http://piqiso.ru/userfiles/file/xapevik.pdf
    • https://dreptultau.hotnews.md/upload/userfiles/files/sisewasubafifuniviposab.pdf
    • http://mazurubezpieczenia.pl/zdjecia/fck/file/32864833215.pdf
    • https://smartech.lv/sites/smartech/uploads/documents/files/zurojobar.pdf
    • https://lapakunited.com/contents/files/ravijadukebuz.pdf
    • http://stroi-sistema.ru/img/53457728860.pdf
    • http://www.sg-callenberg.de/wp-content/plugins/formcraft/file-upload/server/content/files/161353a7ce1b1d---fudumod.pdf
    • http://www.alex-vasilkov.ru/images/wisdom/file/kagumerewekelem.pdf
    • https://grandhotelbulgaria.com/userfiles/file/sodafikegiwos.pdf
    • http://ptk-astana.kz/wp-content/plugins/super-forms/uploads/php/files/447c163db75c39f24c423e14f0a7a95d/38933434020.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=durga+maa+aarti+pdf+download
    • 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_off0000b721.bin
f422b154dd336a246910708ea14c3328d462812472c7013fb159c79a07ca341c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB721 10728 bytes
font_01_sfnt_off0000cf8e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF8E 16792 bytes
font_02_sfnt_off0000e7a0.bin
e9eca41449d9e1edd4b1b0c845491a3613b0e023e422033cb07d192d1358d15a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A0 19812 bytes

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