Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e11efbb433cdda4…

MALICIOUS

PDF

82.9 KB Created: 2021-09-22 23:09:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 131e563fc9f5320e80524852ab3d2727 SHA-1: 98b5fc7b56874776f636f0e999ebb9380992a027 SHA-256: 7e11efbb433cdda4a00f5a9c634c7002e41b7b85502b3bdedeb4743085d7642b
164 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan. Heuristics indicate it functions as a link farm, with multiple URLs pointing to potentially compromised websites or disposable hosting. The presence of a 'Download Now' lure further suggests an attempt to trick users into downloading malicious content, aligning with spearphishing tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dondepodemosir.com/userfiles/file/pifeperujim.pdf In PDF document text
    • https://sibois.eu/userfiles/file/62905612498.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/pigotul.pdfIn PDF document text
    • https://actorconseil.com/files/file/8505092416.pdfIn PDF document text
    • http://xinge168.com/uploads/files/20210912191946_646538.pdfIn PDF document text
    • https://bdprescription.com/ci/userfiles/files/lunagoxijenolomikiseve.pdfIn PDF document text
    • http://sns.hu/_user/file/kigadazuzafabilutolew.pdfIn PDF document text
    • https://pavaniautismschools.com/wp-content/plugins/super-forms/uploads/php/files/jkbqj35mp9q639c1vo1eoga7m7/fuzutadawonowapow.pdfIn PDF document text
    • https://quangcaowebsite.xemlaco.com/uploads/files/jatasimizefifelodum.pdfIn PDF document text
    • https://sharedsynergy.com/userfiles/file/28474747285.pdfIn PDF document text
    • http://www.catalogodecineargentino.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140d12618b16---kimipaluti.pdfIn PDF document text
    • https://albertscience.com/ckfinder/userfiles/files/41153219550.pdfIn PDF document text
    • http://c2ctrading.org/cms_upload/files/didusinisajepepilalulu.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134e40a3cab4---4388464754.pdfIn PDF document text
    • https://www.dentaltaxpros.com/wp-content/plugins/super-forms/uploads/php/files/26107dcc08f4dd622a257c513e10338d/pakiserimetanujaniwa.pdfIn PDF document text
    • http://bon-mar.com/fck_user_files/file/91560034927.pdfIn PDF document text
    • https://kungfuclasshongkong.com/louis/taichi/ckfinder/userfiles/files/2694630281.pdfIn PDF document text
    • http://www.autoservis-hubatka.cz/admin/upload/ww/file/volawakuzogajigi.pdfIn PDF document text
    • https://hatinhjobs.com/upload/files/kuronomudegobixinodoron.pdfIn PDF document text
    • http://theydeserveastamp.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613b629c03391---93545515447.pdfIn PDF document text
    • https://wildnaturetravel.com/File/nomutalujedoledupododofi.pdfIn PDF document text
    • http://shortguycentral.com/ck_uploads/files/56707688107.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/9922271212.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=the+final+exit+full+movie+download+filmywapPDF 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_off0000dadf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10928 bytes
SHA-256: 66641a4289f4a0904f85655ea834a36fc759790226d3152039adbbe634d05eea
font_01_sfnt_off0000f40a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF40A 19096 bytes
SHA-256: e84ec4748e007b93e233b68e427c1c4247e8fedd74e3a26e7867bc53261f3b3c
font_02_sfnt_off000125bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125BD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1