Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd9672cfac4924f5…

MALICIOUS

PDF

80.2 KB Created: 2021-09-21 23:35:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eca884da6dcea3393b58426275e6f239 SHA-1: c87be3f099bef041ef78a96e9bb81fe0da4285e8 SHA-256: bd9672cfac4924f534ef3e56453da86965fe1f30fb15e8052bb82e810bf9aa7a
156 Risk Score

Malware Insights

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

The file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. Heuristics reveal it functions as a link farm, with numerous embedded URLs pointing to external sites, some hosted on compromised CMS uploads or disposable domains. The PDF's structure and the nature of the linked content suggest an attempt to lure users to malicious websites for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 http://sungwoo-n.com/userfiles/file/kisotowetuzafenak.pdf In PDF document text
    • http://tiendanatacion.com/noticias/files/zozujawe.pdfIn PDF document text
    • http://hk888.edo2008.com/com/comimg/file/20210910_000251_104.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/nelorokopam.pdfIn PDF document text
    • http://myphamvickwhitebeck.vn/luutru/files/nuxikisuroji.pdfIn PDF document text
    • http://www.marcado.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161300ee904d9a---98376374805.pdfIn PDF document text
    • http://hanahana.vn/media/ftp/file/jipozepoka.pdfIn PDF document text
    • https://espiber.cl/images/uploadedimages/file/papusujoranajosaxomez.pdfIn PDF document text
    • http://szentimresiklos.hu/upload/file/lixijibotaduvelerakex.pdfIn PDF document text
    • https://shopinhome.com/ci/userfiles/files/dozenelazanijej.pdfIn PDF document text
    • https://tkpmission.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613d313352f4f---35010109714.pdfIn PDF document text
    • https://cardolf.ro/files/nowipasejub.pdfIn PDF document text
    • http://af.ssla.ru/images/fornews/files/18003724392.pdfIn PDF document text
    • https://sagarexpress.com/userfiles/file/giwonifupig.pdfIn PDF document text
    • http://wadsoda.com/UserFiles/File/38371274105.pdfIn PDF document text
    • http://designerhouse.ru/upload/files/28274587483.pdfIn PDF document text
    • http://bestforfishing.com/wp-content/plugins/super-forms/uploads/php/files/d3517e0eb6c9e4d7622a5f52275cedc4/nuwebefubiwoz.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/fexekopedaxi.pdfIn PDF document text
    • https://kotypsy.pl/ckfinder/userfiles/files/54547986208.pdfIn PDF document text
    • http://rootbeadmill.com/upload_fck/file/2021-9-11/20210911095907767064.pdfIn PDF document text
    • http://ats-dz.com/userfiles/file/kupulus.pdfIn PDF document text
    • http://dep14kirov.ru/userfiles/file/68194017590.pdfIn PDF document text
    • https://afmiletisim.com/resimler/files/mabojifajodasewup.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=clone+high+season+1+episode+2PDF 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_off0000d43d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ec4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC4F 17992 bytes
SHA-256: 5f56e7ecbfd2cc5d67fa89236dba84c13a078b9e90ebf14643b024f7bc80eafa
font_02_sfnt_off00011ac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AC4 10676 bytes
SHA-256: 055c358663844a758e80a4a11b21c0d69657adff7413bde45f9e3873ab6991d1