Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3b9fe35523e6e3…

MALICIOUS

PDF

94.3 KB Created: 2021-09-01 19:37:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 5fe5ecc1b33ac8e77ceb18a3a8dd1ced SHA-1: c2bb7c421bcf99eb6ed32f70a191c30d47fe08d2 SHA-256: 7e3b9fe35523e6e3f91bbbf5d36f9016ea03e02e78fae808ea997327df928c82
156 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It functions as a link farm, containing numerous URLs pointing to PDF files hosted on compromised websites. The presence of these links, particularly those on disposable hosting and within compromised CMS upload directories, suggests a phishing or malware distribution scheme. No scripts were extracted, and the document body was unreadable, limiting further analysis of the specific lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://thanhlamresort.vn/wp-content/plugins/formcraft/file-upload/server/content/files/16087ba31e6f86---sunenuxewuboposuzil.pdf In PDF document text
    • https://xn----9sbccjdbca7cyaieg1a3j.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/d1b2ee8678f230dbc10cbe9af8d6c7bf/pegarizupo.pdfIn PDF document text
    • https://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/160a7370c0415f---xefomopusujadasonoxilogit.pdfIn PDF document text
    • http://contactconfiance.com/files/files/leraje.pdfIn PDF document text
    • http://arunimaflavours.com/userfiles/file/xipije.pdfIn PDF document text
    • https://senfina.top/uploads/files/rerumuvaga.pdfIn PDF document text
    • https://steammining.com/userfiles/file/83453637516.pdfIn PDF document text
    • http://verkoop-je-wagen.be/wp-content/plugins/formcraft/file-upload/server/content/files/160a84d32b3adc---37555151511.pdfIn PDF document text
    • https://didacostruzioni.it/userfiles/file/noxajazewugasuvo.pdfIn PDF document text
    • http://ave-france.com/pics/files/firimonobilebigijol.pdfIn PDF document text
    • https://hoavily.com/uploads/files/88241165510.pdfIn PDF document text
    • http://fullx.net/files/kolavolef.pdfIn PDF document text
    • https://master.plus/wp-content/plugins/super-forms/uploads/php/files/38582fb2c3dbeaf285915a3d0cc0c974/62067099490.pdfIn PDF document text
    • http://dolphindp.com/kor/FileData/ckfinder/files/20210618_1CAEDEFF888E3B09.pdfIn PDF document text
    • http://classtool.info/upload/files/bosilubovape.pdfIn PDF document text
    • http://ahkkpcm.org/userfiles/76689050018.pdfIn PDF document text
    • http://lamay.de/userfiles/file/42912702190.pdfIn PDF document text
    • https://tekmaker.com/upload/files/70350797211.pdfIn PDF document text
    • https://brunoamaranti.it/wp-content/plugins/super-forms/uploads/php/files/gmpviucd5ftv1v3nditv4h62s0/21702900.pdfIn PDF document text
    • http://bajajsports.com/userfiles/file/96379186026.pdfIn PDF document text
    • https://wfbulgaria.com/uploads/wysiwyg/files/xurexa.pdfIn PDF document text
    • https://awlights.com/wp-content/plugins/super-forms/uploads/php/files/fa1431e4ef5d20921e31dc8ba15f1721/wawarisedotaxo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=manual+defibrillation+guidelinesPDF 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_off000109c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109C2 18468 bytes
SHA-256: a946c86183023811a37b22ea40c2109c51c538b65937698a96ec2c0520335a1c
font_01_sfnt_off00013a09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A09 10760 bytes
SHA-256: eb8909c672e2482bb32787ab8d2869407b088b90046756cb43670a60185d5dfa
font_02_sfnt_off000152a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x152A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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