Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb87e77486e37a55…

MALICIOUS

PDF

80.7 KB Created: 2021-06-20 02:36:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c11006ce142fadd0c9b4737ac95e68e9 SHA-1: 28ec3057d9e08fad00d17c62889ec66c43ae4f27 SHA-256: fb87e77486e37a5542095014a62fb6accf3aa9f06113521ab90ad9dd1cf56f32
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous links pointing to compromised WordPress sites and disposable hosting, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://www.aserspa.net/wp-content/plugins/super-forms/uploads/php/files/tg7nhnqt5pcplvhss9ct08noea/ridujinuduvofubuvakidix.pdf In PDF document text
    • http://www.stockholmswingallstars.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607f29f484044---dugemizalawesak.pdfIn PDF document text
    • https://zanhotel.ro/beficientconsultingFiles/file/tapivevulo.pdfIn PDF document text
    • http://thermogroup.ru/uploads/files/lonalokuxajudaloli.pdfIn PDF document text
    • https://wsbtitan.com/images/file/2414376602.pdfIn PDF document text
    • https://dbjadow.pl/attachments/file/nobugaronupejibemukazis.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1607e2e6a0947f---98120047383.pdfIn PDF document text
    • https://klubkanine.com/home/klub/public_html/ckfinder/userfiles/files/zuxokalugola.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/badewusugozolamenewiret.pdfIn PDF document text
    • http://shinserviceodi.ru/wp-content/plugins/super-forms/uploads/php/files/27e6477de5d2bdad265aa468f132c40b/85049129152.pdfIn PDF document text
    • https://123kozijnofferte.nl/wp-content/plugins/super-forms/uploads/php/files/1b9qlgpif1s978j1vdls9j5qk1/rezudetumubuparip.pdfIn PDF document text
    • http://collegium-connect.nl/ckupload/files/pibuvizedosejamezafax.pdfIn PDF document text
    • https://thepetrichortouch.com/wp-content/plugins/super-forms/uploads/php/files/s8t3sr1d12t7q94e7jo4mmij2o/43417117159.pdfIn PDF document text
    • http://hagelkonzept.de/userfiles/file/5806193494.pdfIn PDF document text
    • http://www.majoriscambio.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1608e589da6155---paxinigasefunebezafini.pdfIn PDF document text
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/160881f64c542f---14779509168.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/pozerarigaxila.pdfIn PDF document text
    • https://www.dazzlingdecor.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/16096fc9428d2b---pojelinasoned.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=math+brain+teaser+with+answerPDF 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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fc58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC58 4980 bytes
SHA-256: 589a20f19116afa10ad6ead443252b64a58ee33842151cbb83981fdcecc2cf15
font_01_sfnt_off00010d58.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D58 11480 bytes
SHA-256: 09b280358acd87a28f0d7e4a7886ab5d03bd4fb2548ac0ae8792341ac188f55b