Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb63c2748b4623b8…

MALICIOUS

PDF

84.6 KB Created: 2021-09-18 01:08:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7ef899a672d08078516156f2a4051320 SHA-1: 77e8b68ef6ff6ca491a55478be337c8870f8e319 SHA-256: bb63c2748b4623b85244875b1efc68583f38024d43d65dfe5b04e3d12c212111
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links, many pointing to compromised CMS upload directories and disposable hosting, indicating a phishing or redirection scheme. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious sites. No scripts were extracted, but the PDF structure itself is designed for redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://geneolock.com/ckfinder/userfiles/files/falidizafozinapusefuxana.pdf In PDF document text
    • https://hsiaoying.com/userfiles/file/9180161538.pdfIn PDF document text
    • http://mclarenquartz.in/ci/userfiles/files/nujenasu.pdfIn PDF document text
    • http://achwvs.love-mrt.com/upload/files/2450135716.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/32007431728.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/kokawefav.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/94738574546.pdfIn PDF document text
    • http://viswinkelindex.nl/images/uploads/16900146465.pdfIn PDF document text
    • http://dietetyka-24.pl/images/files/zezatexelajekibefa.pdfIn PDF document text
    • https://blv.by/upload/editor/files/wefutedisogimak.pdfIn PDF document text
    • http://www.webtony.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/16140bb476987c---9848833315.pdfIn PDF document text
    • http://gryfarmerskie.pl/pliki_wyswig/files/68491462212.pdfIn PDF document text
    • https://www.higher-energy-trampolineclub.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136441ab5e41---77325711227.pdfIn PDF document text
    • https://trouver-une-ssii.com/img/pics/files/ralelelad.pdfIn PDF document text
    • http://hyundaiokla.com/uploads/files/92434676156.pdfIn PDF document text
    • http://www.kzhep.in.ua/wp-content/plugins/super-forms/uploads/php/files/mh5g9v0v0vcc8867iuusnpojh3/zibimigigakaxu.pdfIn PDF document text
    • https://gedayapi.com/userfiles/file/nubotetelofibozaman.pdfIn PDF document text
    • https://sibservis.com/ckfinder/userfiles/files/24739705054.pdfIn PDF document text
    • http://xn--80aafjbawrcdgsodbdciig4a5v.xn--p1ai/pict/file/58043318140.pdfIn PDF document text
    • https://lbk-ingatlan.hu/uploads/file/dubene.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161366d6d354b2---33475502665.pdfIn PDF document text
    • https://cullinanconstruction.com/wp-content/plugins/super-forms/uploads/php/files/ulk7p342h6ffpa065krbtmai7c/540822652.pdfIn PDF document text
    • http://snsi.jp/image/news_file/mirebifo.pdfIn PDF document text
    • http://caphegiabao.com/upload/fck/file/95103567688.pdfIn PDF document text
    • http://tonyprins.nl/images/uploads/file/89773076633.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=status+update+123moviesPDF 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_off0000e58a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE58A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fda1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA1 10888 bytes
SHA-256: 2953814e40ac32abe15f321bad846c0041cc8119c2f8a1d1d01ecba9bf9d519c
font_02_sfnt_off000116f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116F2 17908 bytes
SHA-256: 0a98c871827a76fa03c92e41adf3a07fa1875e0f8c60158cd7a360b2c69de052