Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec313c96d235de76…

MALICIOUS

PDF

85.1 KB Created: 2021-08-26 04:21:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 3dc634bdbe2f69e4372fa55f7aa251ad SHA-1: 7e80767bf4e7b7625271c74b0ba54b0b12dafaca SHA-256: ec313c96d235de766155f99f1c95e06d409bf1aa9b0b9d3a39c8809338711f7a
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The file functions as a link farm, containing numerous embedded URLs pointing to compromised WordPress upload directories and other potentially untrustworthy hosts. These links are likely intended to lure users to phishing sites or download further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 https://www.teppiche-waschen-hamburg.de/wp-content/plugins/formcraft/file-upload/server/content/files/160912f2af10f2---80821130331.pdf In PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1610d4c814f232---86795761096.pdfIn PDF document text
    • http://lirealestatelitigator.com/wp-content/plugins/super-forms/uploads/php/files/4d58613eaf7361b9919eb5118ca26520/69734607594.pdfIn PDF document text
    • https://carcable-bg.com/uploads/pictures/files/vuzotudosadatisozelakame.pdfIn PDF document text
    • http://brothersaluminium.com.np/wp-content/plugins/formcraft/file-upload/server/content/files/160f387aedd3ff---13368425032.pdfIn PDF document text
    • https://vakukh.ru/wp-content/plugins/super-forms/uploads/php/files/306a206bede0fd795a8fae129b412e74/39518030234.pdfIn PDF document text
    • http://smithmurdock.com/wp-content/plugins/formcraft/file-upload/server/content/files/16114f2a7a2e1b---muveris.pdfIn PDF document text
    • http://inspiredindianfoundation.org/uploads/3875861462.pdfIn PDF document text
    • https://lotteppta.com/beta/assets/file/77210511643.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-6-3/20210603055850938186.pdfIn PDF document text
    • http://clarkstownhs64.com/clients/2/25/255c49a504cbad61718694d8b78dfcdd/File/xowifinivuza.pdfIn PDF document text
    • http://mgmkt.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1610cccaccf281---jokarikijo.pdfIn PDF document text
    • https://briljant-maleri.se/UserFiles/files/90669452773.pdfIn PDF document text
    • https://www.edutechusa.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a76066603f8---82386411696.pdfIn PDF document text
    • http://www.nuricomuvakfi.org/wp-content/plugins/super-forms/uploads/php/files/8aphfmj9us6nd52v20f96ksj63/xeruduvujujokakiju.pdfIn PDF document text
    • http://derma-dts.de/files/file/nozokesu.pdfIn PDF document text
    • http://topopentertainment.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607297166c616---88736547071.pdfIn PDF document text
    • https://goldenparadisestsimons.com/wp-content/plugins/super-forms/uploads/php/files/a7a4e3537802256bbac645516f6db4e1/79746175440.pdfIn PDF document text
    • http://nitexprofi.cz/userfiles/file/45086740271.pdfIn PDF document text
    • https://service-panev.com/userfiles/97749856991.pdfIn PDF document text
    • https://vieclamlaocai.vn/webroot/img/files/kuvobubanixida.pdfIn PDF document text
    • http://msinziniering.com/userfiles/file/revikiwunaforexozebunu.pdfIn PDF document text
    • http://brukbet.com/user_images/file/71702671397.pdfIn PDF document text
    • http://ototavandosemesi.com/resimler/file/4677417153.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=managerial+accounting+15th+edition+solutionPDF 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_off0000e7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7C0 17428 bytes
SHA-256: f7e2ef60d2677652639c2913fb57a1a5004bdf6aa3d6a27e8c62c89ed1582085
font_01_sfnt_off0001157e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1157E 10928 bytes
SHA-256: e2842e2edee88e9198ba2e352fd7c0b0238df315717b6e8d08c798de6cda4b93
font_02_sfnt_off00012e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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