Malicious PDF — malware analysis report

Static analysis result for SHA-256 99ccb375049010a7…

MALICIOUS

PDF

93.7 KB Created: 2021-07-14 08:44:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-14
MD5: a83a3967d4fcaee989f9b9a0ead4c4f5 SHA-1: 448838f33582237c602e24a670166f011527589f SHA-256: 99ccb375049010a7712b00265d2e4e96b3678f59ec1ee9196fc687c0e20d74f5
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document functions as a lure, directing users to a link farm hosted on compromised WordPress sites. The primary goal appears to be tricking users into downloading a password-protected archive, a common tactic to bypass security scanners. While no scripts were directly extracted, the presence of multiple compromised links and the 'Password-protected archive handoff' heuristic strongly suggest a malicious intent to deliver a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9786

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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.quatainvestimentos.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160958d243c7db---65883413687.pdf In PDF document text
    • https://www.die-umzugsfabrik.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606feaa131587---46470903954.pdfIn PDF document text
    • http://www.puhito.hu/uploads/28832820824.pdfIn PDF document text
    • http://grhs1983.com/clients/72571/File/13122703652.pdfIn PDF document text
    • https://www.rowtheerne.com/wp-content/plugins/super-forms/uploads/php/files/9a849e15459825cfebcc6e180ecfae33/70308831883.pdfIn PDF document text
    • http://luatsutiengtrung.com/app/webroot/uploads/files/15002327162.pdfIn PDF document text
    • http://neuragen.ca/wp-content/plugins/formcraft/file-upload/server/content/files/1608f91192afe0---67009573161.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607328d788c66---25935583704.pdfIn PDF document text
    • http://campcolefamilyreunion.com/clients/82065/File/pikuxesufutupetuxilexik.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210522045509102.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/160dbdbd28b10a---rakoviku.pdfIn PDF document text
    • http://hayatteknoloji.com/webimage/file/62016324079.pdfIn PDF document text
    • http://aydinservis.com/ckfinder/userfiles/files/17367526778.pdfIn PDF document text
    • http://kaplanpm.com/wp-content/plugins/formcraft/file-upload/server/content/files/160c950869db6d---karixekoriber.pdfIn PDF document text
    • https://rfcorporation.net/wp-content/plugins/super-forms/uploads/php/files/b9356b2549d48c6d2bc2a51f96530cfe/rabumobelizonowovonaroni.pdfIn PDF document text
    • http://acetuitioncentre.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1607c2e6ab6726---foxidivufiz.pdfIn PDF document text
    • http://hobbstownis100.com/clients/6/66/66141d04a4341350d76ae3a38785cb5a/File/budiwurudor.pdfIn PDF document text
    • https://cremeconferences.com/wp-content/plugins/super-forms/uploads/php/files/335b04eb85ea9fefea717af33f8b25e2/20459252032.pdfIn PDF document text
    • http://www.segurosfacility.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/160b77abec9ea0---66598484841.pdfIn PDF document text
    • https://wrd13.com/force/file/nexomuwugemopekux.pdfIn PDF document text
    • https://stdtekstil.com/upload/ckfinder/files/78182034684.pdfIn PDF document text
    • https://aravlicraft.com/cmsCart//upload/file/48317639819.pdfIn PDF document text
    • http://www.celso.org/download/99802020511.pdfIn PDF document text
    • https://rubyyadav.com/nbloom/fckuploads/file/noruxuzipipiwuxapalex.pdfIn PDF document text
    • http://border-inn.com/CKEdit/upload/files/46786387733.pdfIn PDF document text
    • http://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/160892df812c06---debezanuxinakedijusuko.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=ap+style+quiz+answersPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f6db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6DB 16296 bytes
SHA-256: e4c930b016a2a6d656d08513964d38d88530f0f1756c28e8f93c523238fa2b03
font_01_sfnt_off00010cce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CCE 16784 bytes
SHA-256: 643f4ec940dcac89d2e9c82bbb01c1fca9d8fa9079399940f7d2955b81595cc4
font_02_sfnt_off0001386d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1386D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_03_sfnt_off00015084.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15084 10612 bytes
SHA-256: d6765a86d34f6b36e5a7b53a3d9ab70d2c5fe04c489a95f19c3c3301642fee4b

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