Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb21460af7c391c9…

MALICIOUS

PDF

76.6 KB Created: 2021-09-09 14:28:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: dc9c43e555369a0c31d175ac82c63f31 SHA-1: 0fc4289baa15c9fb642108e2bda4e4f8156a4f91 SHA-256: bb21460af7c391c933066f9228999986e00d8b7faede67b286029e641f0802e0
216 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple heuristics indicating a link farm and a lure for password-protected archives, suggesting it's a delivery mechanism for malicious payloads. The ClamAV detection and ML classifier further support its malicious nature. The document's structure and embedded URLs point towards an attempt to trick users into downloading further malicious content, likely disguised as legitimate files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://nibrasimansch.com/userfiles/files/71206521954.pdf In PDF document text
    • https://e-ceramika.pl/userfiles/file/jetoneviteveberazekanujo.pdfIn PDF document text
    • https://bahispesinde.com/gnc/veri/_files/legonewimevunureg.pdfIn PDF document text
    • https://www.sacproblemleri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134cda090f6d---wakidalufixarupik.pdfIn PDF document text
    • http://himalayakebab.irafbrothers.com/shipinc/userfiles/files/92779069660.pdfIn PDF document text
    • https://maisonforville.be/documents/file/23461028819.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/judopikediruna.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-4/20210904011544597842.pdfIn PDF document text
    • http://gospel-pour-100-voix.com/fichiers/newsletter/file/biwaf.pdfIn PDF document text
    • http://aircond.md/upload_fck/file/19728553442.pdfIn PDF document text
    • http://dlastudenta.org/Upload/file/23196556997.pdfIn PDF document text
    • http://evabody.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161368c092845b---3653343516.pdfIn PDF document text
    • https://vanchuyenduongsat.vn/upload/files/pogazaga.pdfIn PDF document text
    • https://jingchengs.com/jingchengs/ckfinder/files/20210902055327.pdfIn PDF document text
    • https://webhostmurah.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136aaa0aef23---puvokidamonatobus.pdfIn PDF document text
    • http://findingthegrey.com/userfiles/file/64100337346.pdfIn PDF document text
    • https://totalyoumovement.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134aefeb5fff---bigurenovobasatoximoxevez.pdfIn PDF document text
    • https://axlthailand.com/imagexx/files/dafedefojove.pdfIn PDF document text
    • http://ttccid.com/userfiles/file/29364516335.pdfIn PDF document text
    • http://massageindex.nl/images/uploads/15838537140.pdfIn PDF document text
    • http://vyveva.eu/UserFiles/File/vuzofumujinanumup.pdfIn PDF document text
    • http://hwayoung.kr/upfile/files/nazowizoserutowopepibiwo.pdfIn PDF document text
    • https://ylwlgwadmin.ylwl.cn/upload/files/jetaxawivafovibijafi.pdfIn PDF document text
    • http://year-c.com/upload_fck/file/2021-9-6/20210906095250290219.pdfIn PDF document text
    • http://sapientgenerator.ru/files/userfiles/files/xojafozar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3CAf4wW3hvY/uplcv?utm_term=tak+tak+app+download+pubgPDF 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_off0000c8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8D7 10456 bytes
SHA-256: 8989d7fb975c61e4dae564a103774c115eda8c5f736a82491750789ab2839c0d
font_01_sfnt_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f862.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF862 17188 bytes
SHA-256: ad543ad3a51322b3f561ac82fdd167841253ee9c31c2ad7ce8470cf20a2f5e88

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